BQ25620: BQ25620RYKR/WQFN_18

Hello, 

Thank you for reaching out via E2E. Please see my comments below. 

Firstly, I can confirm that if VINDPM register is set to 7.04V and you are using a 5V adapter then the device will not charge. This is expected behavior when VINDPM setting is > VBUS voltage. 

On BQ25620 device VINDPM power on default configuration is 4.6V and will not change on its own. If VINDPM value is 7.04V that means your I2C host wrote to REG0x08 and changed the setting. I recommend you double check your firmware implementation. 

Additionally, as confirmation of VINDPM setting in your test what is the hex (or binary) value you read from REG0x08 and REG0x09? 

Best Regards,

Garrett 

The following is the value read out from the register.
reg 0 ff
reg 1 ff
reg 2 40
reg 3 6
reg 4 20
reg 5 d
reg 6 40
reg 7 6
reg 8 0
reg 9 16
reg a 20
reg b 3
reg c c0
reg d f
reg e 0
reg f b
reg 10 50
reg 11 0
reg 12 a0
reg 13 0
reg 14 6
reg 15 5d
reg 16 a3
reg 17 4f
reg 18 4
reg 19 c0
reg 1a 3f
reg 1b 25
reg 1c 3f
reg 1d 4
reg 1e b
reg 1f 0
reg 20 4
reg 21 9
reg 22 80
reg 23 0
reg 24 0
reg 25 0
reg 26 30
reg 27 0
reg 28 0
reg 29 0
reg 2a 0
reg 2b 0
reg 2c 0
reg 2d 0
reg 2e 0
reg 2f 0
reg 30 0
reg 31 0
reg 32 0
reg 33 0
reg 34 0
reg 35 0
reg 36 0
reg 37 0
reg 38 2

After the equipment malfunctioned, the values read out were all 7.04.Given this situation, if we want to test whether it is the I2C host causing this anomaly, are there any suggested testing methods?