BQ25601: the charging current would decrease to 1A after rising to 2A for a period of time

Chen,

A few things come to mind

- The JEITA charge profile could be reducing the charge current. JEITA_ISET can be set to 0 to reduce charge current to 50% of ICHG (Is the battery thermistor between 0C to 10C?) Please check REG09[2:0]

- Is there a transient system load that could have activated and reduced the charge current through DPM? Please check REG0A[6:5]

- Is the adapter (VBUS) crashing or reducing power output for safety reasons?

Thanks,

Ricardo

Hi Ricardo

Today, a program was changed to output the value of the register, and it was found that there was a current from 2a->, 1a->, 2A process to summarize the value of REG08 into three stages:

1, the prophase is 0x75;

The middle of the 2 is 0x75, and 0x74 repeats for about 5 minutes.(as shown in the screenshot on the left)

3 the anaphase is 0x74;

4 the left log screenshot is the value of reg00-reg0b, and the right screenshot is the battery charging curve.

Please help to analyze the situation and remind us of the matters needing attention in use.

Chen,

Based on the REG08 map, it looks like the device is going into VSYSMIN regulation when the charging current drops. This occurs when the device is trying to maintain the minimum system voltage on the SYS node and the battery is less than VSYSMIN. Is this an actual battery being charged or are you simulating a battery with bench equipment?

Thanks,

Ricardo