Schematic Design Assistance
Thought for 42 sec
Read-only verification completed; I did not modify the schematic.
Table
| ESP32-C3 pin | Net name | Connected component pins on that net |
|---|---|---|
| GPIO3 | IRQ_SHARED_GPIO3 | U1:GPIO3, U2:IRQ, U5:~{INT} |
| GPIO4 | I2C_SDA_GPIO4 | U1:GPIO4, U2:SDA, U3:SDA, U4:SDA_OUT, U5:SDA, OLED1:SDA, R6:P2 |
| GPIO5 | I2C_SCL_GPIO5 | U1:GPIO5, U2:SCL, U3:SCL, U4:SCL_OUT, U5:SCL, OLED1:SCL, R7:P2 |
| GPIO6 | RGB_DATA_GPIO6 | U1:GPIO6, R21:P1 |
| GPIO7 | FP_TOUCHOUT_GPIO7 | U1:GPIO7, J1:8 |
| GPIO8 | STATUS_LED_GPIO8 | U1:GPIO8 |
| GPIO10 | GPIO10_SPARE_TP | U1:GPIO10 |
| GPIO20 | FP_UART_TX_TO_ESP_RX_GPIO20 | U1:GPIO20, J1:5 |
| GPIO21 | FP_UART_RX_FROM_ESP_TX_GPIO21 | U1:GPIO21, J1:4 |
| 3V3 | 3V3 | U1:3V3, U2:VDD, U2:ADDR, U3:VDD, U3:VDD_NC, U3:EN, U4:3.3v power, U4:RESET, U5:VCC, J1:6, J1:7, LED1:VDD, LED2:VDD, LED3:VDD, LED4:VDD, OLED1:5V, R6:P1, R7:P1, R22:P1, R23:P1, R24:P1, R25:P1, R26:P1, C5:P1, C7:P1, C9:P1, C10:P1, C11:P1, C12:P1, C13:P1, C14:P1 |
| GND | GND | U1:GND, U2:VSS, U3:GND, U4:SPGND, U5:GND, U5:A0, U5:A1, U5:A2, J1:1, J1:2, J1:9, J1:10, J1:11, J1:12, LED1:GND, LED2:GND, LED3:GND, LED4:GND, OLED1:GND, SW1:P2, SW2:P2, SW3:P2, SW4:P2, R8:P2, C5:P2, C6:P2, C7:P2, C8:P2, C9:P2, C10:P2, C11:P2, C12:P2, C13:P2, C14:P2 |
Confirmations:
- ✅ Fingerprint FPC
J1:5UART_TX connects to ESPGPIO20;J1:4UART_RX connects to ESPGPIO21. - ⚠️ Fingerprint OTP
J1:3is isolated from MCU/other circuitry, but current netlist shows onlyJ1:3onFP_OTP_TP_ONLY; I do not see a test pad connected. - ✅ MPR121
ADDRis tied to3V3. - ⚠️ BNO055 ADR cannot be verified from this selected BNO055 sublayout; no ADR pin is exposed. Address-low/open is therefore an assumption, not netlist-confirmed.
- ⚠️ MPR121
IRQand TCA9534A~INTshareIRQ_SHARED_GPIO3to ESPGPIO3, but I do not see an external pullup on that IRQ net.
Please fix exactly these two issues and nothing else: 1) Add a test pad component on net FP_OTP_TP_ONLY so fingerprint OTP J1:3 has an actual test pad, as originally specified. 2) Add a 10 kOhm pullup resistor from net IRQ_SHARED_GPIO3 to 3V3, since MPR121 IRQ and TCA9534A INT are open-drain and the line currently has no pullup. Do not change any GPIO assignments, nets, or other components. BNO055 ADR is fine as-is (module handles addressing internally). After the fixes, re-run ERC and confirm both changes.
Thought for 6 sec
I’ll make only those two schematic fixes: add an OTP test pad to
FP_OTP_TP_ONLY and add a 10 kΩ pullup from IRQ_SHARED_GPIO3 to 3V3, then rerun ERC.Worked for 1 min 42 sec
Done — made only the two requested schematic changes.
Confirmed:
- Added
TP37to fingerprint OTP netFP_OTP_TP_ONLY; it is associated withJ1:3/ OTP test-only connectivity. - Added
R31 = 10kΩpullup:R31:P1→3V3R31:P2→IRQ_SHARED_GPIO3IRQ_SHARED_GPIO3containsU1:GPIO3,U2:IRQ,U5:~{INT}, andR31:P2.
ERC re-run result: no
ERROR, WARNING, or OPEN checks returned.Review, document, layout
Run schematic review
Update project notes
Start PCB placement
Check BOM availability
