We have ADC reading questions for VIN, IIN and ICHG. Customer use meter to measure actual value to compare with ADC measurement as below. But we don't know why the actual value and ADC reading value cannot match. Could you please provide your suggestion if there is any wrong calculation? Thanks.
- VBAT voltage – 3.586v
- VBAT ADC value – 0x9915 = 3587.8mV
BQ25155_RegRead address:0x42 data:0x99
BQ25155_RegRead address:0x43 data:0x15
- ICHG current – mean 13mA
- ICHG ADC value – 0x00fb, We cannot understand the formula in page 21 of datasheet.
BQ25155_RegRead address:0x46 data:0x0
BQ25155_RegRead address:0x47 data:0xfb
- VIN voltage – 4.615v
- VIN ADC value – 0x6613 = 2392mV, the result is different with actual value.
BQ25155_RegRead address:0x4a data:0x66
BQ25155_RegRead address:0x4b data:0x13
- IIN current – 380mA
- IIN ADC value – 0x1559 = 62.5mA, , the result is different with actual value.
BQ25155_RegRead address:0x4e data:0x15
BQ25155_RegRead address:0x4f data:0x59