The charging chip is bq25883,
When the device is shut down, the plug-in adapter will light up the green light first, and then the red light (the measured stat has 800ms high level);
The problem is that normally, the red light should always be on. Why does the stat have 800ms high level, causing the green light to flash
1.
CHA_ After the pull-up of stat is changed to VREF, when the adapter is inserted, Cha_ The stat will still have a high level of about 16ms, resulting in the green light flashing, but it is much shorter than the original 800ms
2.
Hi Kevin,
Is R1242 DNP in the schematic? If so, then how is CHA_RED pulled down in order to turn on the red LED?
Please capture a waveform showing VBUS, VSYS, STAT, and SW on the same graph. The STAT pin conditions are shown in Table 7. It will be helpful to see the STAT waveform.
Best regards,
Angelo
