2024-10-21 09:10 AM
I want to monitor my 4.2V battery and cant find any MCU which can convert such high voltage . It will be even better if it has differential ADC [can do 1.5-4.5].Previously tries STM32F303C8T6 but all the ADC pins are only 3.3V Tolerant. Its my first time posting so really don't know if i'm posting in the right page.
2024-10-21 09:14 AM
No, but there are resistors, so you may make simple voltage divider... :)
2024-10-21 09:18 AM
Generally no, you'd need to condition externally. Perhaps via a battery monitoring / charging IC?
I vaguely recollect one that can measure VBAT/2
2024-10-21 09:23 AM
@Soothertion wrote:I want to monitor my 4.2V battery
4.2V suggests lithium?
Note that terminal voltage is a rather poor indicator of state-of-charge for lithium batteries.
As @Tesla DeLorean suggested, a proper battery monitor chip would do better.
For just terminal voltage, as @gbm said, you can use a simple potential divider - but beware that will put a drain on the battery...