ZHCSCE2I October 2013 – March 2022 BQ76920 , BQ76930 , BQ76940
PRODMIX
A 16-bit integrating ADC, commonly referred to as the coulomb counter (CC), provides measurements of accumulated charge across the current sense resistor. The integration period for this reading is 250 ms.
The CC may be operated in one of two modes: ALWAYS ON and 1-SHOT.
To enable a 1-SHOT reading, ensure [CC_EN] = 0 and set [CC_ONESHOT] = 1.
The fullscale range of the CC is ± 270 mV, with a max recommended input range of ± 200 mV, thus yielding an LSB of approximately 8.44 μV.
The following equation shows how to convert the 16-bit CC reading into an analog voltage if no board-level calibration is performed:
| 16-Bit CC Result | ADC Result in Decimal | CC Reading (in μV) |
|---|---|---|
| 0x0001 | 1 | 8.44 |
| 0x2710 | 10000 | 84,400 |
| 0x7D00 | 32000 | 270,080 |
| 0x8300 | –32000 | –270,080 |
| 0xC350 | –15536 | –131,123.84 |
| 0xFFFF | –1 | –8.44 |