Part Number: BQ25756
Hi,
I’m using BQ25756 in my design (schematic attached).
We previously had a working version where charging could stop normally when battery voltage reached the set threshold. But in the current version, charging no longer stops at the voltage limit.
After checking, it looks like EN_PFM is default high (PFM mode enabled). In the datasheet (page 23), it says PFM should be disabled when termination current is below 2A.
So I think the issue is related to PFM mode affecting charge termination behavior.
Normally I would disable EN_PFM via host I2C register, but in our current system there is no MCU connected yet, so we cannot modify registers.
My questions:
- Is EN_PFM always default enabled at power-up?
- Is there any hardware way (pin / resistor / configuration) to force-disable PFM without MCU?
- Can PFM mode prevent charge termination at CV stage?
- Or is there something else in BQ25756 config that could cause this behavior?
Thanks!
