Hi
The customer design with BQ25792, and set the charging current 1.5A, when the battery is 3V, then start to charge, but charge current sometimes100mA, sometimes 300mA, sometimes 1.5A.
Attached the register setting:
| REG00 0x04 |
| REG01 0x1A4 |
| REG03 0x96 |
| REG05 0x2F |
| REG06 0x12C |
| REG08 0xC3 |
| REG09 0x05 |
| REG0A 0x23 |
| REG0B 0xDC |
| REG0D 0xBB |
| REG0E 0x39 |
| REG0F 0x22 |
| REG10 0x80 |
| REG13 0x01 |
| REG14 0x1E |
| REG17 0x7A |
| REG18 0x14 |
Schematic as below:
The waveform as below:
1. Battery voltage 3.1V: ch1:VSYS ch2:Vbat ch3:Ibat
2, When the battery voltage is charged to 3.16V, change a battery with 4.1V to confirm the charging current, the waveform is as follows:
3, Re-insert the battery that has just been charged to 3.16V, the charging current is 1.46A, repeatedly plugging in and out the USB and the battery, the charging current is always about 1.5A, there is no abnormality, at this time the VSYS voltage is about 4.2V
Please give some suggestion with this query.
Thanks
Star
