Rev A Locked Architecture Details
Run AD5940 datasheet limits review only.
Do not modify schematic wiring.
Do not add components.
Do not change nets.
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
flux
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
Thought for 4 sec
1/4 Read current AD5940 placeholder connectivity, rails, and support components in the schematic
Read current AD5940 placeholder connectivity, rails, and support components in the schematic
Extract AD5940 rail, I/O, and application-circuit requirements from datasheet/application references
Map current placeholder nets to likely AD5940 functions and identify blockers
Report only the requested AD5940 datasheet-limits conclusions
Accessed knowledge for the next task.
Thought for 8 sec
Read ad5940.html.
Read an-1557.html.
Read pdf.html.
Reading schematic details for U_AD5940, U_MCU_STM32L552, U_LDO_ANALOG_AVDD and 5 more.
Thought for a moment
flux
The response is taking longer than expected.
STOP
Thinking this through...
