Hello,
We have a problem of charge with the BQ25892 when the battery is too low.
The product is directly supplied by the output (vsyst) of the charger including the host. The problem sometimes happens when the product is only supplied by the battery and when the charge of the battery is becoming too low (below than 3V). When we tried to plug in a usb on vbus, nothing happens the battery doesn't charge. The charger is stuck. The product stays power supplied by the battery until it's too low.To renable the charge, we have to unplug the battery to reset the BQ.
We have made different measures at this moment (usb plug in). We have 800 mV on vsyst.
Here is the curve of REGN. It’s look like the LDO tried to start every 1s.
Here is the states of all the registers :
Register 0 : 0x52
Register 1 : 0x06
Register 2 : 0x5D
Register 3 : 0x10
Register 4 : 0x08
Register 5 : 0x10
Register 6 : 0x5A
Register 7 : 0x8D
Register 8 : 0x03
Register 9 : 0x44
Register A : 0x73
Register B : 0x02
Register C : 0x80
Register D : 0x12
Register E : 0x00
Register F: 0x00
Register 10 : 0x00
Register 11 : 0x00
Register 12 : 0x00
Register 13: 0x12
Register 14: 0x05
Thanks in advances.
Best Regards
Clement RUFFIER