🔋 The Battery...Which Xiao and Why?

[msfujino]

Hi PJ,
The information on the ESP32C3 charge controller seems to be different from earlier lots. Have you confirmed this in any way?

ESP32-C3 XIAO Battery Charging IC

Does anyone know the IC used for for the battery charging circuit? The schematic just labels it as U1 and does not give a part number. I want to use a secondary 4.5V power supply (not a battery) to power the board when USB is not plugged in, so I planned on connecting it to the battery pads. This is higher than a battery’s typical voltage, so I just want to make sure it’s safe to do so. The 3.3V LDO regulator circuit looks like it would work with a 4.5V power supply, but I can’t confirm that t…

Charging characteristics of XIAO_nRF52840 and XIAO_ESP32C3

XIAO_nRF52840 and XIAO_ESP32C3 have a built-in charging function, but since the circuit diagram was not disclosed, I assumed that they have the same circuit. I was curious and measured the charging characteristics. They are completely different, XIAO_nRF52840’s charging current can be set to 50mA or 100mA by firmware, but XIAO_ESP32C3’s is fixed and very large at 370mA, so I need to be very careful when using small capacity batteries. [XIAO_Charge]