Xiao ESP32-C3 and ESP32-S3 deep sleep current high

[msfujino]

I think the low battery voltage is causing the built-in 3.3V regulator to consume more current.
I tried it with C3 and it was about 50uA when 3.8V was applied from the battery pad and 80uA when 3.3V or lower. With S3 10uA and 300uA.

Please also refer to the following links.

Comparison of Sleep Currents for XIAO ESP32C6, S3, and C3

Now that I have three different XIAO ESP32s (C3, S3, and C6), compared their sleep currents. I hope this will be helpful when considering low-power applications. First, I analyzed the schematic and datasheet as a reference. A 3.3V analog regulator XC6210 is used in C3, and this regulator’s quiescent current of 35uA accounts for most of the C3 sleep current. However, a diode NSR0520 is used, which has low reverse current, giving it an advantage in this area compared to S3 and C6. The power sup…

Although not related to sleep current, note the following when using C3 and S3.

1. It is dangerous to supply power from USB-C while a non-LiPo battery is connected to the battery pad.
2. At least 3.3V is required from the battery batts, as it passes through a regulator.
3. When powering from the 3V3 pin, the minimum operating voltage of 3.0V or higher is required for C3 and S3.
4. When using a radio, a battery capable of supplying a peak current of more than 200mA is required.