ESP32-P4 Board Design Inquiry
Thought for 5 sec
I’ll tighten the placement around the ESP32-P4, flash, DSI connector, and SD socket to shorten the unrouted flash/DSI/SD nets, then rerun the relevant DRC/airwire check.
Worked for 10 mins 46 sec
The first placement pass shortened the flash/DSI/SD paths, but it introduced a visible overlap around the SD socket and a Wi‑Fi edge warning. I’m correcting those before reporting the final check results.
Thought for 9 sec
Placement pass completed around the ESP32-P4: flash was pulled closer to U1, the DSI connector was moved closer to the ESP32-P4, display power stayed near it, and the SD socket was moved closer to reduce SD/DSI/flash airwire length.
Open items:
- I’m blocked now because there are no available ACUs.
- The placement pass introduced issues that still need cleanup: SD socket overlap, Wi‑Fi module edge/outside-board warning, and new overlapping-copper warnings.
- DRC/airwire checks still need to be rerun after that cleanup.
Suggested next steps:
- Add ACUs, then ask me to fix the SD/Wi‑Fi placement issues.
- Rerun DRC and airwire checks.
- Resume routing once placement is clean.
Fix and rerun checks
Fix placement issues
Rerun checks
Show copper overlaps
Optimize ESP32 cluster
Refine this doc
Ask about this doc
Key specs
- Display: 4-inch IPS capacitive touchscreen
- Resolution: 720 × 720
- Display interface: DSI / MIPI 2-lane when used with ESP32-P4-NANO
- Display IC: JD9365
- Touch IC: GT928
- Refresh: up to 60 Hz
- Touch: ten-point capacitive
- Glass: optical bonding, toughened glass, up to 6H hardness
Power
- Input voltage: 4.75 V min, 5.00 V nominal, 5.30 V max
- Input current: 0.3 A nominal; supply should support at least 0.3 A
- This confirms the gauge controller needs a regulated 5 V display rail, separate from 3.3 V logic.
ESP32-P4 notes
- Waveshare indicates ESP32-P4-NANO drives this display over MIPI 2-lane.
- ESP-IDF component/driver:
waveshare/esp_lcd_jd9365 - Backlight brightness can be controlled by I2C write 0x00–0xFF to device 0x45, register 0x96.
Connector notes
- Wiki mentions Raspberry Pi 22-pin and 15-pin DSI cable variants depending host board.
- The scraped wiki content does not expose a signal-by-signal connector pinout table.
- Before final PCB layout, use Waveshare’s 2D/3D mechanical files and/or schematic for exact FFC connector pinout, orientation, and mating height.
Design implications
- Keep the 5 V display rail budget at ≥0.3 A plus margin; the existing TPS54302 3 A buck is sufficient for display + controller overhead if thermals/layout are good.
- Keep MIPI DSI as controlled-impedance differential routing from ESP32-P4 to display connector.
- Add I2C connection for display/touch/backlight control once the exact connector pinout is confirmed.
Key specs
Power
ESP32-P4 notes
Connector notes
Design implications
