Pi Zero Replacement Discussion
Worked for 3 mins 49 sec
Execution is now blocked because there are no available ACUs.
What I accomplished:
- Started manual reconstruction from the verified BOM/CPL/PDF/Gerber references.
- Chose to reconstruct the original Pi Zero baseline first, then migrate that verified baseline to CM4/native Ethernet.
- Added the original power input / regulator block components:
U10power input connectorF1input fuseD4SMCJ58A TVS equivalentU7LMR33630 5V buckU16AP63300 buckU8/U9/U15PMEG4030ER Schottky diodesL1/L2inductors- Power capacitors/resistors around the buck regulators
- Wired much of the input protection and 5V buck section:
VCC_INPWR_GNDPROTECTED_12V+5VU7_SWU7_BOOTU7_FBU7_VCCU7_PG
- Consulted datasheets for the AP63300 and LMR33630 regulator topology before wiring.
Important caveat:
- Work stopped mid-power-block. The AP63300 / 12V distribution section is not fully wired or validated yet.
- I also added four 10uF capacitors intended as
C14-C17, but because of existing designator conflicts they were assigned asC14,C9,C10, andC11. These need to be renamed/fixed when ACUs are available.
Current state:
- The schematic is partially reconstructed.
- Do not proceed to layout yet.
- Next step is to finish wiring and validating the power block, then continue block-by-block: Pi Zero header, W5500 Ethernet, RS-485 muxed OSDP, MCP23017 I/O, opto inputs, and relays.
Fix power block
Run ERC review
AP63300 wiring gaps
Pi header next
Waiting for input
