Other Parts Discussed in Thread: BQ77915,
Hi,
Hope you are doing good.
We have 3s 2p configuration of li-ion batteries(ncr18560B).
as of now, we have a 3.3V (MIC5205-3.3YM5)regulator connected at the load point. When the battery pack is connected without the presence of an adapter, the regulator out measures 3.3 V (BATDRV measures -3.86V)
when an adapter is connected, we observed that the ACFET AND RBFET (Q2A) don't turn on and the battery doesn't charge.
We connected a DC source at the adapter terminals and measured the following voltages:
(all the voltages are measured with respect to ground)
battery voltage = 11.05V ( between Bat+ and Bat-)
adapter voltage= 15.5V
ACDRV= 2.83V
ACDET= 2.4V
CMSRC= 2.30V
ACOK= 3.25V
IOUT=0V
BATDRV= 0.82V
LODRV= 0V
HIDRV= 11.06V
VCC=18.25V
REGN= 6.05V
PHASE=11.05V
BTST= 10.78V.
The register settings are as follows:
charge options= 0x8144h
charge voltage=0x3130h
Min system voltage= 0x2400h
charge current = 0x1000h
input current= 0x0c80
I am attaching the schematic below.
Can you please help me out in knowing what might be the reasons for the battery not charging?
Thank-you
Warm Regards
Harini Krishna