ESP32 to BQ76952 Connection Guide

  • Connected U2:GPIO3, U1:SDA, R1:P1, C6:P1 to ^SDA
  • Connected R1:P2, U3:VOUT, U2:3V3 to ^3V3
  • Connected C6:P2, U3:GND, U2:GND, U2:GND__1 to ^GND
nets { net Net 2 = U1:SCL; net SDA = U2:GPIO3, C6:P1, R1:P1, U1:SDA; net 3V3 = R1:P2, U2:3V3, U3:VOUT; net GND = C6:P2, U2:GND, U2:GND__1, U3:GND; }

Checked ERC and found missing power errors

0:25

Started: Running ERC review for wiring validation.
Checking 12 design areas.

Task unable_to_complete.

0:15

Started: Fetching existing power wiring context from schematic.
Reading schematic for J3, U3, U4.
Work done
  • Connected U2 GPIO3 to U1 SDA and labeled the net as SDA.
  • Added pull-up R1 (4.7 kΩ) between SDA and 3V3.
  • Added shunt capacitor C6 (100 nF) between SDA and GND.
Success criteria review
  • ✅ ESP32 GPIO3 is connected to BQ76952 SDA
  • R1 is connected between 3V3 and SDA
  • C6 is connected between SDA and GND
  • ❌ ERC is not clean: project has existing "Missing Power" ERC errors (e.g., J3 VBUS, U3 VIN, U4 VBAT pins are not powered)
Next steps If you want ERC fully clean, I can fix those pre-existing power-net issues by wiring the intended power sources (or adding power flags if appropriate). Tell me what should feed U3 VIN (USB VBUS via J3, battery via J1/J2, etc.) and whether U4 should be populated/used in this design.
U3
R1 P2 - U3 VOUT
C6 P2 - U3 GND
U2 GPIO3 - U1 SDA
U2 GPIO3 - U1 SDA
U2 GPIO3 - U1 SDA
U2 GPIO3 - U1 SDA
R1 P2 - U3 VOUT
C6 P2 - U3 GND
C6 P2 - U3 GND
R1 P2 - U3 VOUT
R9
R5
Resistance
10kΩ
C5
U5
C6
Capacitance
100nF
C11
C12
Capacitance
0.1uF
F1
R4
Resistance
10kΩ
C13
Capacitance
0.1uF
C2
Capacitance
Capacitance
R7
Resistance
10kΩ
J3
C1
Capacitance
Capacitance
R1
Resistance
4.7kΩ
C9
C10
R6
Resistance
10kΩ
R8
U2
J2
D4
U6
U4
D3
J1
Q1
C3
Capacitance
10uF
C4
Capacitance
10uF
D1
D2
D5
U1

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