ZHCSI54A September 2016 – May 2018 BQ25890H
PRODUCTION DATA.
With battery charging is enabled (CHG_CONFIG bit = 1 and CE pin is low), the device autonomously completes a charging cycle without host involvement. The device default charging parameters are listed in Table 4. The host can always control the charging operations and optimize the charging parameters by writing to the corresponding registers through I2C.
| DEFAULT MODE | bq25890 | bq25892 |
|---|---|---|
| Charging Voltage | 4.208 V | 4.208 V |
| Charging Current | 2.048 A | 2.048 A |
| Pre-charge Current | 128 mA | 128 mA |
| Termination Current | 256 mA | 256 mA |
| Temperature Profile | JEITA | JEITA |
| Safety Timer | 12 hour | 12 hour |
A new charge cycle starts when the following conditions are valid:
The charger device automatically terminates the charging cycle when the charging current is below termination threshold, charge voltage is above recharge threshold, and device not in DPM mode or thermal regulation. When a full battery voltage is discharged below recharge threshold (threshold selectable via VRECHG bit), the device automatically starts a new charging cycle. After the charge is done, either toggle CE pin or CHG_CONFIG bit can initiate a new charging cycle.
The STAT output indicates the charging status of charging (LOW), charging complete or charge disable (HIGH) or charging fault (Blinking). The STAT output can be disabled by setting STAT_DIS bit. In addition, the status register (CHRG_STAT) indicates the different charging phases: 00-charging disable, 01-precharge, 10-fast charge (constant current) and constant voltage mode, 11-charging done. Once a charging cycle is completed, an INT is asserted to notify the host.