Other Parts Discussed in Thread: BQ25890
Hello,
Our customer's tablet project using BQ25896 for battery charging, but encountered a problem during the debugging, that is, after the PE fast charging 9V3A was turned on, there would be regular low pulses with a time interval of about 45s.
The waveform diagram is shown in the figure below (note that the yellow is the voltage waveform and the blue is the current waveform):
The customer tried to find the software problem, by setting the input limit current to 3200mA gear, and setting the input current to 2944mA gear. It was found that the current limit register and the charging current register did not change when the problem occurred during the charging process.
The software initialization settings are as follows:
bq25890_wd_reset(1); bq25890_otg_en(0); bq25890_en_chg_timer(1); bq25890_set_iterml(0x2); bq25890_set_vreg(0x22); bq25890_set_VBAT_clamp(0x7); bq25890_set_VBAT_IR_compensation(0x4); bq25890_config_interface(bq25890_CON9, 1, 0x1,4); bq25890_set_batlowv(0x1); bq25890_set_iprechg(0x1); bq25890_set_ichg(0x20); bq25890_set_iinlim(0x3F); bq25890_set_FORCE_VINDPM(1); bq25890_set_VINDPM(0x13); bq25890_set_en_hiz(0x0);
The charging current limit register value is 0x7e and did not change.
The charging current register value is 0x2e and did not change.
Can you help analyze the cause of the regular low pulse phenomenon?
Thanks,
Best Regards
