Before ordering, verify that your firmware BSP (Board Support Package) includes the device tree overlay for the V4’s new ADC reference voltage chip. V3 firmware will run, but analog accuracy will drop from 12-bit to 10-bit effective.
A visual guide used for locating physical components (resistors, capacitors, ICs) on the board surface during repairs. C3E MB PCB V4 Documentation | PDF - Scribd c3e-mb-pcb-v4
If you are designing the physical board, this is the text that would appear printed on the circuit board itself: Before ordering, verify that your firmware BSP (Board
: Includes a USB Type-C connector for power and communication, alongside onboard UART/JTAG functionality. C3E MB PCB V4 Documentation | PDF -
Result: Brownouts eliminated. Quiescent current dropped from 80µA (V3) to 15µA (V4)—extending battery life from 9 months to 2 years.
Features the WTR2965 transceiver and power amplifiers like the QPA8685 for cellular connectivity.