BSI-901-fpga-software/.codex_csi040_spec_extract.txt

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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 31 of 59 Figure 20 DCStim Sample Timing 4.4.6. Analog Test Mux T he Analog Test Mux provides access to various internal signals for use in characterization, debug and production trim and test . The Analog Test Mux buffers or, if the signal is a current, routes these signals to the ATEST pin. When an i mpedance m easurement or s ampling is enabled the Analog Test Mux buffer is also enabled to provide this output to the ATEST pin. 4.4.7. Serial Peripheral Interface The ASIC SPI interface is an industry - standard SPI Slave. It provides 1MHz serial communication access to th e ASIC from the MCU SPI Master. The interface includes four I/Os: Serial Clock [ SCK ], Chip Select complement [ CSN ], Slave - Input [ SI ], and Slave - Output [ SO supports burst reads and writes by which the MCU can write a read/write instruction and a starting address, and then read or write multiple successive data words for a range of addresses. The detailed sequences and timing for the SPI read and write procedures are documented in section s 4.4. 7 .1 and 4.4. 7 .2. SPI p arameter upda tes for a STIM channel shall occur during its Dead Zone 1 (DZ1) time . The steps for the update are as follows:


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 32 of 59 - P rogram the Interrupt Enable and Select Register (see section 4.4. 8 .3) to select the STIM channel to control the interrupt pin. - W hen the interru pt pin asserts, the DZ1 Register contents of the selected STIM channel are placed in a shadow register so that when the DZ1 R egister is updated during this time its updated value does not take e ffect until the following DZ1 time occurs for the selected channel. It is incumbent on the user to only write the parameter updates while DZ1 is occurring, thus a priori knowledge of the DZ1 time is required to limit the parameter update time. The SPI interface is suppl SPI Timing Specifications PARAMETER MIN TYP MAX UNITS SCK Frequency 1.0 10 MHz Input Setup Time 250 ns Input Hold Time 250 ns Output Valid Time 100 ns Output Hold Time 0 ns Output Rise/Fall Time 100 ns SPI Timing Diagrams Figure 21 Byte Read


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 33 of 59 Figure 22 Byte Write Figure 23 Burst Read Figure 24 Burst Write


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 34 of 59 4.4.8. Control Registers REGISTER ADDRESS R/W REGISTER NAME FUNCTION DEFAULT VALUE SECTION R Status 1 channels 0 - 7 operating status 4.4. 8 .1 R Status 2 channels 8 - 15 operating status 4.4. 8 .1 R/W Control FAST STIM enable initiate impedance measurement enable TRIG input pin simultaneous stop of all therapy sessions power up global charge redistribution ratio reset to register defaults 00h 4.4. 8 .2 R/W Interrupt Select interrupt function and channel selection 00h 4.4. 8 .3 R/W Z Measure /Samp channels select 00h 4.4. 8 .4 R/W Z Current /Cal current amplitude & calibration 00h 4.4. 8 . 5 R/W Z Delay & Range & Samp Z delay time & FS range & sampling controls 00h 4.4. 8 .6 R/W Chan Enable 1 channels 0 - 7 enable 00h 4.4. 8 . 7 R/W Chan Enable 2 channels 8 - 15 enable 00h 4.4. 8 . 7 R/W Test & DCS Mode Key s enables test mode & DCStim mode 00h 4.4. 8 .8 R/W Test Modes test mode definitions 00h 4.4. 8 .9 R/W Current Ref Trim trim bits for the bandgap reference currents 08h 4.4. 8 .10 h to R/W Reserved reserved for future use 00h R/W CH0 Misc Params amplitude range current polarity ramp enable stim current trim 8 0h 4.4. 8 . 11 R/W CH0 Current A pulse A amplitude 00h 4.4. 8 . 12 R/W CH0 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4. 8 . 12 R/W CH0 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4. 8 . 12 R/W CH0 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4. 8 . 12 R/W CH0 STIM PW & DCS STIM pulse width for pulses A, B, C , D & DCStim STIM sink enable 00h 4.4. 8 . 13 R/W CH0 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4. 8 . 14


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 35 of 59 R/W CH0 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4. 8 .1 5 R/W CH0 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4. 8 .1 6 R/W CH0 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4. 8 .1 6 R/W CH0 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4. 8 .1 7 R/W CH0 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4. 8 .1 8 R/W CH0 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4. 8 .1 9 R/W CH0 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4. 8 .20 R/W CH0 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4. 8 .21 R/W CH0 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4. 8 .22 R/W CH1 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH1 Current A pulse A amplitude 00h 4.4.8.12 R/W CH1 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH1 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH1 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH1 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH1 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14 R/W CH1 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH1 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH1 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH1 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH1 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH1 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH1 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH1 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 0 0h 4.4.8.21


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 36 of 59 R/W CH1 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH2 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH2 Current A pulse A amplitude 00h 4.4.8.12 R/W CH2 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH2 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH2 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH2 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH2 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redis tribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14 R/W CH2 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH2 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH2 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH2 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH2 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH2 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH2 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH2 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH2 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH3 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH3 Current A pulse A amplitude 00h 4.4.8.12 R/W CH3 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH3 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH3 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH3 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH3 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resist or enable 00h 4.4.8.14


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 37 of 59 R/W CH3 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH3 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH3 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH3 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH3 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH3 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH3 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH3 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH3 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH4 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH4 Current A pulse A amplitude 00h 4.4.8.12 R/W CH4 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH4 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH4 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH4 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH4 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor e nable 00h 4.4.8.14 R/W CH4 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH4 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH4 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH4 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH4 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH4 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH4 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH4 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 38 of 59 R/W CH4 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH5 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH5 Current A pulse A amplitude 00h 4.4.8.12 R/W CH5 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH5 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH5 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH5 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH5 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor e nable 00h 4.4.8.14 R/W CH5 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH5 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH5 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH5 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH5 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH5 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH5 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH5 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH5 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH6 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH6 Current A pulse A amplitude 00h 4.4.8.12 R/W CH6 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH6 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH6 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH6 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH6 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor e nable 00h 4.4.8.14


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 39 of 59 R/W CH6 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH6 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH6 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH6 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH6 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH6 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH6 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH6 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH6 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH7 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH7 Current A pulse A amplitude 00h 4.4.8.12 R/W CH7 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH7 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH7 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH7 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH7 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor e nable 00h 4.4.8.14 R/W CH7 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH7 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH7 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH7 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH7 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH7 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH7 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH7 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 40 of 59 R/W CH7 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH8 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH8 Current A pulse A amplitude 00h 4.4.8.12 R/W CH8 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH8 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH8 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH8 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH8 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor e nable 00h 4.4.8.14 R/W CH8 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH8 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH8 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH8 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH8 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH8 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH8 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH8 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH8 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH9 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH9 Current A pulse A amplitude 00h 4.4.8.12 R/W CH9 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH9 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH9 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH9 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH9 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor e nable 00h 4.4.8.14


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 41 of 59 R/W CH9 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH9 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH9 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH9 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH9 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH9 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH9 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH9 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH9 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH10 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH10 Current A pulse A amplitude 00h 4.4.8.12 R/W CH10 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH10 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH10 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH10 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH10 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14 R/W CH10 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH10 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH10 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH10 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH10 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH10 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH10 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH10 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 42 of 59 R/W CH10 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH11 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH11 Current A pulse A amplitude 00h 4.4.8.12 R/W CH11 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH11 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH11 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH11 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH11 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14 R/W CH11 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH11 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH11 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH11 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH11 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH11 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH11 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH11 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH11 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH12 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH12 Current A pulse A amplitude 00h 4.4.8.12 R/W CH12 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH12 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH12 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH12 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH12 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 43 of 59 R/W CH12 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH12 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH12 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH12 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH12 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH12 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH12 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH12 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH12 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH13 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH13 Current A pulse A amplitude 00h 4.4.8.12 R/W CH13 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH13 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH13 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH13 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH13 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14 R/W CH13 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH13 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH13 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH13 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH13 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH13 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH13 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH13 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 44 of 59 R/W CH13 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH14 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH14 Current A pulse A amplitude 00h 4.4.8.12 R/W CH14 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH14 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH14 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH14 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH14 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14 R/W CH14 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH14 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH14 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH14 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH14 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH14 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH14 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH14 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH14 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W CH15 Misc Params amplitude range current polarity ramp enable stim current trim 80h 4.4.8.11 R/W CH15 Current A pulse A amplitude 00h 4.4.8.12 R/W CH15 Current B & DCS pulse B amplitude & DCStim enable 00h 4.4.8.12 R/W CH15 Current C & DCS pulse C amplitude & DCStim channel enable 00h 4.4.8.12 R/W CH15 Current D & DCS pulse D amplitude & DCStim STIM source enable 00h 4.4.8.12 R/W CH15 STIM PW & DCS STIM pulse width for pulses A, B, C, D & DCStim STIM sink enable 00h 4.4.8.13 R/W CH15 Dead Zone 0 & DCS time between STIM pulse end and redistribution pulse start and time between redistribution pulse end and DZ1 start & DCStim discharge resistor enable 00h 4.4.8.14


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 45 of 59 R/W CH15 Dead Zone 1 time between STIM pulse/redistribution pulse end and next STIM pulse/redistribution pulse start 00h 4.4.8.15 R/W CH15 STIM Skip A & B number of skipped pulses for pulses A & B 00h 4.4.8.16 R/W CH15 STIM Skip C & D number of skipped pulses for pulses C & D 00h 4.4.8.16 R/W CH15 STIM Pulse Number number of contiguous STIM pulses in a THERAPY pulse 00h 4.4.8.17 R/W CH15 Dead Zone 2 time between THERAPY pulse end and start of the next THERAPY pulse 00h 4.4.8.18 R/W CH15 Therapy Delay delay time from the start of a therapy session to the start of the first STIM pulse 00h 4.4.8.19 R/W CH15 THERAPY Pulse Number number of contiguous THERAPY pulses in a MASTER pulse 00h 4.4.8.20 R/W CH15 Dead Zone 3 time between MASTER pulse end and start of the next MASTER pulse 00h 4.4.8.21 R/W CH15 MASTER Pulse Number number of contiguous MASTER pulses 00h 4.4.8.22 R/W STIM TRIGGER simultaneous start of all therapy sessions 00h 4.4.8.23 R/W GPR1 general purpose register 00h 4.4.8.24 R/W GPR2 general purpose register 00h 4.4.8.24 R/W GPR3 general purpose register 00h 4.4. 8 .24 R/W GPR4 general purpose register 00h 4.4. 8 .24 R/W GPR5 general purpose register 00h 4.4. 8 .24 R/W GPR6 general purpose register 00h 4.4. 8 .24 R/W GPR7 general purpose register 00h 4.4. 8 .24 R/W GPR8 general purpose register 00h 4.4. 8 .24 R/W GPR9 general purpose register 00h 4.4. 8 .24 R/W GPR10 general purpose register 00h 4.4. 8 .24 R/W GPR11 general purpose register 00h 4.4. 8 .24 R/W GPR12 general purpose register 00h 4.4. 8 .24 R Part ID part number 28h 4.4. 8 .25 R Revision revision number 00h 4.4. 8 .26


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 46 of 59 Status 1 & 2 Registers ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT R Status 1 CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 R Status 2 CH15 CH14 CH13 CH12 CH11 CH10 CH9 CH8 BITS 0 - 7 (CHx) Every bit in these two registers indicates, by its assertion, that the respective channel is operating in its Dead Zone 1 (DZ1) phase. See Figure 2 in section 4.4.2.2 for the DZ1 description. Control Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT 2 h R/W Control RST RAT[1] RAT[0] PUP STOP TRIG Z FSTM 00h BIT 0 ( FSTM ) This bit places the part in FastStim mode when asserted. In this mode the reference clock for all channel timing is increased from 100kHz to 400kHz and hence, all channel timing parameters are reduced to one fourth their value s . See section 4.4.2. 3 for new values . Note: STIM pulses programmed t o < 7.5us in this mode may not meet accuracy specs. BIT 1 ( Z ) W hen asserted , t his bit initiates an impedance measurement between two STIM channel outputs defined by the contents of the Impedance Measurement Registers. Once the measurement is complete this bit is cleared. When an impedance measurement is initiated and either, or both, of the involved channels are running a therapy session this bit is cleared and the impedance measurement is not performed . The Analog Test Mux buffer is enabled concurrently with the Impedance Measurement block to provide the measurement output at the ATEST pin. If sampling mode is enabled (ENS = 1) then this bit is READ only, see section 4.4.8.6. BIT 2 (TRIG) This bit enables the ext ernal TRIG pin which, when asserted, simultaneously starts all therapy sessions. Once the TRIG pin is asserted and all therapy sessions are started , this pin is ignored until BIT 3 (STOP) is asserted or all therapy sessions are complete. BIT 3 ( STOP ) This bit simultaneously stops all therapy sessions . When the STOP bit is asserted, any STIM channel that is sourcing/sinking current will continue operating until a subseq uent dead zone (not DZ0) is encountered at which time its therapy session stops . If RAMP is enabled on any channel then, when the STOP bit is asserted, the current therapy session i s


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 47 of 59 complete d and the down ramp is executed. In the case of continuous stim pulses (DZ2[7:0] = , with RAMP enabled, the ramp down is immediately executed . In the case of FastStim stim pulses with RAMP enabled, the ramp down is also immediately executed . Once all channels have stopped operating this bit is cleared . BIT 4 ( P UP ) This bit, when asserted, powers up the Current Reference as well as allowing all channel s to be enabled by writing to their respective bits in the Channel Enable registers. It also allows the impedance measurement function to be initiated by writing a 1 the Z bit. When this bit is de - asserted, all analog resources are powered off but SPI communication continues. BITS 5 & 6 (RAT[1:0]) These two bits set the charge redistr ibution pulse - width multiply ratio and the charge redistribution pulse amplitude divide ratio for all channels . See section 4.4.2.1. BIT 7 (RST) This bit, when asserted, immediately resets all the registers to their respective default values and then cl ears itself. Interrupt Function and Select Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT R/W Interrupt Select - - INT[3] INT[2] INT[1] INT[0] 00h BITS 0 - 3 ( INT[3:0] ) These four bits select which STIM channel control s the INT pin . The INT pin asserts when the selected channel is operating in its Dead Zone 1 (DZ1) phase as indicated in the Status Registers . There is no interrupt function when operating in the FastStim mode. Decode of the INT[3:0] bits is as follows: INT[3:0] = value => Cha nnel (value ) INT[3:0] = 0000b => Channel 0 INT[3:0] = 1111b => Channel 15 Impedance Measurement /Sampling Channel Regist er ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT R/W Z Meas /Samp CHB[3] CHB[2] CHB[1] CHB[0] CHA[3] CHA[2] CHA[1] CHA[0] 00h BITS 0 - 3 ( CHA[3:0] ) For impedance measurement mode, t hese four bits select the channel that source s the test current and hence, connected to the positive input of the Impedance


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 48 of 59 Measurement block. For s ampling mode, these four bits select the channel that is applied to the positive input of the Impedance Measurement block. If CHA[3 :0] = CHB[3:0] then the impedance measurement and sampling modes shall not occur. BITS 7 - 4 (CHB[3:0]) For impedance measurement mode, t hese four bits select the channel that sinks the test current and is connected to the negative input of the Impedance Measurement block . For s ampling mode, these four bits select the channel that is applied to the negative input of the Impedance Measurement block. Impedance Measurement Amplitude and Calibration Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT R/W Z Current /Cal CAL AMZ[6] AMZ[5] AMZ[4] AMZ[3] AMZ[2] AMZ[1] AMZ[0] 00h BITS 0 - 6 (AMZ[6:0]) For impedance measurement mode, t hese seven bits select the Impedance Measurement current amplitude level for both selected channels . Both STIM and charge redistribution pulses have the same amplitude and pulsewidth. BIT 7 (CAL) This bit, when asserted, from the programmed channels and shorts them toget her so that both positive and negative inputs to the Impedance Measurement block are equal . This allows - in offset (~150mV) at the ATEST output pin to be measured externally . T his built - in offset needs to be externally subtracted from al l subsequent impedance and sampling measurements . Impedance Measurement Rang e , Delay and Sampling Controls Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT R/W Z D elay & Range & Samp HLD ENS RAN[1] RAN[0] DLY[3] DLY[2] DLY[1] DLY[0] 00h BITS 0 - 3 (DLY[3:0]) For impedance measurement mode, t hese four bits select the delay time from the application of the impedance measurement current to the time the impedance measurement sample is held. Each LSB step is 10us, for example: DLY [3:0] = 0000b => 10us DLY[3:0] = 1111b => 160us


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 49 of 59 BITS 5 - 4 (RAN[1:0]) For impedance measurement mode, t hese two bits set the Impedance Measurement STIM current full - scale range. The full - scale range definition is found in section 4.4.2.1. BIT 6 ( ENS ) This bit , when asserted, enables the sampling mode by turn ing on the Impedance Measurement and Analog Test blocks and placing them in track mode . When tracking, the channels programmed in the Z Meas/Samp register are applied to the Impedance Measurement block inputs and the ATEST pin output is at the built - in of fset value (~150mV) . If impedance mode is enabled (Z = 1) then this bit is READ only, see section 4.4.8.2. BIT 7 (HLD) This bit, when asserted, enables the hold mode where the voltage difference between the two programmed channels is held for approxima tely 17.5 us, attenuated and applied to the ATEST output pin. After the 17.5 us hold time , the Impedance Measurement and Analog Test blocks are placed back in track mode and the sample is no longer available at the ATEST output pin. After approximately 25 us , this bit is self - cleared and ready to be asserted again thus providing a maximum sampling rate of 40ks/s. Writing to 0 has no effect on this bit. If BIT 6 (ENS ) is not asserted , then this bit is set to 0 and is READ only. Channel Enable 1 & 2 Registe rs ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT 7 h R/W Chan Enable1 CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 00h 8 h R/W Chan Enable 2 CH15 CH14 CH13 CH12 CH11 CH10 CH9 CH8 00h BITS 0 - 7 ( CHx ) Each of these bits, when asserted, enable its respective STIM channel . Test & DC Stim Mode Enable Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT 9 h W Test & DC S Mode Keys T E [7] TE [6] TE [5] TE [4] TE [3] TE [2] TE [1] TE [0] 00h BIT 0 - 7 (TE [7:0]) To enable T est mode the following three register writes must occur in succession. 1 st register write: 10101010b => AAh 2 nd register write: 01001100b => 4Ch


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 50 of 59 3 rd register write: 11110101b => F5h To unlock DC Stim mode for all channels the following three register writes must occur in succession. After DCStim mode is unlocked, each channel must be individually enabled for DCStim mode by asserting its respective DCM register bit . 1 st register write: 01010101b => 5 5 h 2 nd register write: 10110011 b => B3 h 3 rd register write: 00001010 b => 0A h To exit either T est or DC Stim mode a single write must occur: 11111001b => F9h To change mode s, the current mode must be exited . Test Modes & Status Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT A h R/W Test Mode DC TM TST[1] TST[0] CH[3] CH[2] CH[1] CH[0] 00h BIT 0 - 3 ( CH [3:0]) These four bits select the channel for test: CH[3:0] = 0000b => Channel 0 CH[3:0] = 1111b => Channel 15 BIT 5 - 4 (TST[1:0]) These two bits select the test signal for the selected channel : BIT 6 (TM) This status bit is asserted when Test Mode has been enabled as described in section 4.4.8.8. This is a READ only bit. BIT 7 (DC) This status bit is asserted when DCStim Mode has been globally enabled as described in section 4.4.8.8. This is a READ only bit. TST[1 :0] ATEST Test Signal Value 00 bandgap summed ref current (sink to GND) 32 µA 01 channel current DAC output (source off AVDD) 0 127 µA 10 channel trimmed ref current (sink to GND) 4µA 11 channel ref current from the bandgap (sink to GND) 2µA


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 51 of 59 Test Mode Definitions Current Reference Trim ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT B h R/W Current Ref Trim - - - - RT [3] RT [2] RT [1] RT [0] 08h BITS 0 - 3 ( RT [3:0]) These four bits provide reference current trim of the top level Current Reference block. Trim characteristic s are shown in table below. RT [3:0] TRIM RT [3:0] TRIM 0000 - 4.0% 1000 0.0% 0001 - 3. 5% 1001 0.5% 0010 - 3.0% 1010 1.0% 0011 - 2. 5% 1011 1.5% 0100 - 2.0% 1100 2.0% 0101 - 1. 5% 1101 2.5% 0110 - 1.0% 1110 3.0% 0111 - 0. 5% 1111 3.5% Reference Current Trim Table Channel Miscellaneous Parameters Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 1 R/W CHx Misc Params CT [3] CT [2] CT [1] CT [0] RAMP POL RAN[1] RAN[0] 8 0h * N ote 1: this description applies to all 16 channels BIT S 0 & 1 ( RAN [ 1: 0 ]) These two bits set the STIM current full - scale range . The full - scale range definition is found in section 4.4.2.1. BIT 2 ( POL ) This bit sets the polari ty of the STIM pulse. See section 4.4.2.1. BIT 3 ( RAMP ) This bit enables the ramp function when asserted (see Figure 10 in section 4.4.2.2). BITS 4 - 7 ( CT [3:0] ) These four bits provide individual channel trim for each ELEC current output. Trim characteristic s are shown in table below.


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 52 of 59 CT [3:0] TRIM CT [ 3:0] TRIM 0000 - 4.0% 1000 0.0% 0001 - 3. 5% 1001 0.5% 0010 - 3.0% 1010 1.0% 0011 - 2. 5% 1011 1.5% 0100 - 2.0% 1100 2.0% 0101 - 1. 5% 1101 2.5% 0110 - 1.0% 1110 3.0% 0111 - 0. 5% 1111 3.5% Channel Current Trim Table STIM Pulse Amplitude & DCStim Control Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 2 R/W CHx Current & DCS X y AM y [ 6 ] AM y [ 5 ] AM y [ 4 ] AM y [ 3 ] AM y [ 2 ] AM y [ 1 ] AM y [ 0 ] 00h * Note 2 : this description applies to amplitude pulses (y = A, B, C & D) and all channels (x = 0 thru 1 5 ) BITS 0 - 6 ( AM y [6:0]) AM y [ 0 ] (LSB) - A M y [ 6 ] (MSB) are a 7 - bit binary word that sets the STIM pulse amplitude based upon the full scale range set by RAN [1:0] in section 4.4. 2.1 . BIT 7 (X y ) These bits are the controls for DCStim mode . X B (DCM) This bit enables DCStim mode when asserted. When e nabled, therapy session trigger assertions are ignored. X C (ENA) This bit enables the channel in DCStim mode when asserted. When this bit is set to 0, both SRC and SNK bits are reset to 0. This bit is set to 0 and is READ only when DCM is not asserted. X D (SRC) This bit enables source STIM current off VMAXx rail when asserted. This bit is set to 0 and is READ only when DCM = 0 or DCM = 1 & ENA = 0. STIM Pulse Width & DCStim Control Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 3 R/W CHx STIM PW & DCS SNK PW [ 6 ] PW [ 5 ] PW [ 4 ] PW [ 3 ] PW [ 2 ] PW [ 1 ] PW [ 0 ] 00h * Note 3 : th is description applies to all channels (x = 0 thru 1 5 ) BITS 0 - 6 ( PW [ 6:0 ] ) PW [ 0 ] (LSB) - PW [ 6 ] (MSB) are a 7 - bit binary word that sets the STIM pulse width and by implication, with the RAT[2:0] parameter, sets the charge redistribution pulse


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 53 of 59 width also. See Figure 1 in section 4.4.2.2. The range and resolution for the STIM PW is found in section 4 .4.2.1. BIT 7 (SNK) This bit enables sink STIM current to the GND rail when asserted. The SRC bit has precedence over this bit, i.e. SRC = SNK = 1 => source STIM current off VMAXx rail. This bit is set to 0 and is READ only when DCM = 0 or DCM = 1 & EN A = 0. Dead Zone 0 & DCStim Control Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 4 R/W CHx Dead Zone 0 & DCS ENR DZ0[6] DZ0[5] DZ0[4] DZ0[3] DZ0[2] DZ0[1] DZ0[0] 00h * Note 4 : this description applies to all channels (x = 0 thru 1 5 ) BITS 0 - 6 (DZ0[6:0]) DZ0[0] (LSB) - DZ0[6] (MSB) are a 7 - bit binary word that sets the Dead Zone 0 (DZ0) time. See Figure 1 in section 4.4.2.2. The range a nd resolution for Dead Zone 0 are found in section 4.4.2.1. BIT 7 (EN R ) This bit connects the Discharge Resistor between VREFx and its electrode output (ELEC) when asserted and disconnects it when not asserted. This bit is set to 0 and is READ only when DCM = 0. Dead Zone 1 Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 5 R/W CHx Dead Zone 1 DZ1[7 ] DZ1[6] DZ1[5] DZ1[4] DZ1[3] DZ1[2] DZ1[1] DZ1[0] 00h * Note 5 : this description applies to all channels (x = 0 thru 15) BITS 0 - 7 (DZ1[ 7 :0]) DZ1[ 7 :0] is an 8 - bit binary word that sets the Dead Zone 1 (DZ1) time. The different range s and resolution s for Dead Zone 1 are found in section 4.4.2.1. This register is shadowed such that when a Dead Zone 1 time occurs, this register can be upda ted with a SPI write but not affect the current Dead Zone 1 timing. The register update takes effect on the following Dead Zone 1 time. See Figure 2 in section 4.4.2.2. for Dead Zone 1 description. Skipped STIM Pulse Registers ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 6 R/W CHx STIM Skip A & B - SKB[2] SKB[1] SKB[0] - SKA[2] SKA[1] SKA[0] 00h Note 6 R/W CHx STIM Skip C & D - SKD[2] SKD[1] SKD[0] - SKC[2] SKC[1] SKC[0] 00h * Note 6 : this description applies to amplitude pulses (y = A, B, C & D) and all channels (x = 0 thru 1 5 )


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 54 of 59 BITS 0 - 3 & 4 - 7 (SKy[ 7 :0]) Each SKy[ 3 :0] and SKy[ 7 : 4 ] 3 - bit binary word (bits 7 & 3 are not used) sets the number of skipped pulses for each respective amplitude pulse (A, B, C & D). See Figures 5 & 7 in section 4.4.2.2. See section 4.4.2.1 for skip values. Contiguous STIM Pulses in a T HERAPY Pulse Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 7 R/W CHx STIM Pulse Number M[7] M[6] M[5] M[4] M[3] M[2] M[1] M[0] 00h * Note 7 : this description applies to all channels (x = 0 thru 1 5 ) BITS 0 - 7 (M[7:0]) M[0] (LSB) - M[7] (MSB) are an 8 - bit binary word that sets the number of STIM pulses in a THERAPY pulse . See Figure 8 in section 4.4.2.2. See section 4.4.2.1 for pulse number values. Dead Zone 2 Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 8 R/W CHx Dead Zone 2 DZ2[7] DZ2[6] DZ2[5] DZ2[4] DZ2[3] DZ2[2] DZ2[1] DZ2[0] 00h * Note 8 : this description applies to all channels (x = 0 thru 1 5 ) BITS 0 - 7 (DZ 2 [ 7 :0]) DZ 2 [0] (LSB) - DZ 2 [ 7 ] (MSB) is a n 8 - bit binary word that sets the Dead Zone 2 (DZ2) time. See Figure 8 in section 4.4.2.2. The range and resolution for Dead Zone 2 are found in section 4.4.2.1. When DZ2[7:0] = 00h the output is continuous STIM pulses as using the timing parameters PW, RAT, DZ0, DZ1 and pulse skipping parameter SKP. T herapy Delay Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 9 R/W CHx Therapy Delay TD [7] TD [6] TD [5] TD [4] TD [3] TD [2] TD [1] TD [0] 00h * Note 9 : this description applies to all channels (x = 0 thru 15) BITS 0 - 7 ( TD [7:0]) TD [0] (LSB) - TD [7] (MSB) are an 8 - bit binary word that sets the delay time from the start of therapy to the first STIM pulse . See Figure s 9 thru 11 in section 4.4.2.2. The range and resolution for Therapy Delay is found in section 4.4.2.1.


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 55 of 59 Contiguous THERAPY pulse s in a MASTER Pulse Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 1 0 R/W CHx THERAPY Pulse Number N[7] N[6] N[5] N[4] N[3] N[2] N[1] N[0] 00h * Note 10 : this description applies to all channels (x = 0 thru 15) BITS 0 - 7 ( N [7:0]) N [0] (LSB) - N [7] (MSB) are an 8 - bit binary word that sets the number of THERAPY pulses in a MASTER pulse. See Figure s 9 & 10 in section 4.4.2.2. See section 4.4.2.1 for pulse number values. Dead Zone 3 Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 1 1 R/W CHx Dead Zone 3 DZ3[7] DZ3[6] DZ3[5] DZ3[4] DZ3[3] DZ3[2] DZ3[1] DZ3[0] 00h * Note 11 : this description applies to all channels (x = 0 thru 15) BITS 0 - 7 (DZ3[7:0]) DZ3[0] (LSB) - DZ3[7] (MSB) is an 8 - bit binary word that sets the Dead Zone 3 (DZ3) time. See Figure 9 & 11 in section 4.4.2.2. The range s and resolution s for Dead Zone 3 are found in section 4.4.2.1. Contiguous MASTER Pulse Re gister ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 1 2 R/W CHx MASTER Pulse Number P[7] P[6] P[5] P[4] P[3] P[2] P[1] P[0] 00h * Note 12 : this description applies to all channels (x = 0 thru 15) BITS 0 - 7 (P[7:0]) P[0] (LSB) - P[7] (MSB) are an 8 - bit binary word that sets the number of MASTER pulses. See Figures 9 thru 1 1 in section 4.4.2.2. See section 4.4.2.1 for pulse number values. STIM Trigger Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT W - C STIM Trigger TGR[7] TGR[6] TGR[5] TGR[4] TGR[3] TGR[2] TGR[1] TGR[0] 00h


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Document: ASIC Specification For CSI 040 ECN: 097 Revision: 2.2 Effective: 26Mar2020 CONFIDENTIA L Page 56 of 59 BITS 0 - 7 (TGR[7:0]) When TGR[7:0] = AAh the programmed stimulation therapy pulses for all channels start simultaneously. This register is cleared immediately after it has been written to. While therapy sessions are in progress, a write to this register is ignored. General Purpose Registers ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT Note 13 R/W GPRx GP[7] GP[6] GP[5] GP[4] GP[3] GP[2] GP[1] GP[0 ] 00h * Note 13: this description applies to all 12 General Purpose Registers BITS 0 - 7 ( GP [7:0]) These 12 registers are for general use and can be utilized for future functions. Part Identification Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT h R Part ID 0 0 1 0 1 0 0 0 28 h BITS 0 - 7 (28h) This register is set to 28h = 40d to identify the part as CSI040. Revision Register ADDR R/W REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 DEFAULT h R Revision 0 0 0 0 0 0 0 0 00h BITS 0 - 7 (00h) This register indicates the revision of the part. 4.4.9. Test Modes Testing of the digital block shall be implemented using scan to minimize test time and achieve high test coverage. An analog test mux shall be used for testing and trimming the bandgap reference. It is also used for testi ng STIM channel parameters such as reference currents and current DAC outputs.