Rev A Locked Architecture Details
Run AD5940 datasheet limits review only.
Do not modify schematic wiring.
Do not add components.
Do not change nets.
Review the AD5940 placeholder against datasheet/application-circuit requirements and identify what must be locked before PCB layout.
Check:
- Rail requirements:
- AVDD valid voltage range
- DVDD valid voltage range
- IOVDD / digital I/O rail requirement
- REG_1V8 role
- whether DVDD_AD5940 may remain tied to MCU_3V3: yes/no/uncertain
- whether separate 1.8 V rail placeholder is required: yes/no/uncertain
- SPI/logic compatibility:
- whether STM32L552 3.3 V SPI can directly connect to AD5940: yes/no/uncertain
- whether level shifting may be required: yes/no/uncertain
- BioZ/EIS pins:
- map placeholder nets to likely AD5940 pins/functions: AD5940_I_PLUS_PATH AD5940_I_MINUS_PATH AD5940_V_PLUS_PATH AD5940_V_MINUS_PATH AD5940_CURRENT_SENSE_P AD5940_CURRENT_SENSE_N AD5940_EXC_MON AD5940_AIN_MON
- Application-circuit blockers:
- required external references
- required RTIA/RLOAD/RCAL components
- required clock/crystal if any
- required decoupling not already represented
- required reset/interrupt/control pins
- Pre-layout decision: Choose one: A. Keep AD5940 as placeholder only B. Add separate 1.8 V LDO placeholder C. Add level-shifter placeholder only D. Split DVDD_AD5940 from MCU_3V3 E. Need human datasheet review before schematic changes
Report only:
- AD5940 rail blockers
- SPI/logic blockers
- missing application-circuit components
- recommended next schematic action
- whether current AD5940 section is safe for PCB layout: yes/no
Thought for 7 sec
I’ll run a read-only AD5940 datasheet-limits review against the current placeholder section, check rails, SPI logic, pin-role mapping, and application-circuit gaps, then report only the blockers and next action.
Worked for 1 min 10 sec
STOP
Sorry for the wait — almost done...
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J_ELECTRODE_DOCK Pin Table
J_ELECTRODE_DOCK is the premium front-panel electrode/phantom dock placeholder.
Connector class:
Premium keyed medical/test-grade push-pull circular connector, LEMO/REDEL or equivalent.
Do not use cheap screw terminal as the primary connector.
Pin table:
1 E1
2 E1_GUARD
3 E1_SHIELD_AGND
4 E2
5 E2_GUARD
6 E2_SHIELD_AGND
7 E3
8 E3_GUARD
9 E3_SHIELD_AGND
10 E4
11 E4_GUARD
12 E4_SHIELD_AGND
13 E5
14 E5_GUARD
15 E5_SHIELD_AGND
16 E6
17 E6_GUARD
18 E6_SHIELD_AGND
19 E7
20 E7_GUARD
21 E7_SHIELD_AGND
22 E8
23 E8_GUARD
24 E8_SHIELD_AGND
25 CAL_COM_SHIELD_AGND
26 GUARD_DRV_COMMON
Rules:
- CAL_COM itself is internal and is not exposed as an electrode pin.
- E1-E8 are live external electrode inputs.
- Each electrode supports signal, guard, and shield.
- Guard/shield behavior will be defined later.
- Final connector manufacturer part number is not locked yet.
- Do not modify schematic wiring.
- Do not add new components.
