BQ24193: charge timer

Kuramoto,

If the charger device is in DPM regulation or thermal regulation during charging, the actual charging current will be less than the programmed value. In this case, termination is temporarily disabled and the charging safety timer is counted at half the clock rate.

Referring to 8.3.3.6 Charging Safety Timer on the d/s:

The following actions restart the safety timer: • At the beginning of a new charging cycle • Toggle the CE pin HIGH to LOW to HIGH (charge enable) • Write REG01[5:4] from 00 to 01 (charge enable) • Write REG05[3] from 0 to 1 (safety timer enable) • Write REG01[7] to 1 (software reset)

During input voltage/current regulation or thermal regulation, the safety timer counts at half clock rate since the actual charge current is likely to be below the register setting. For example, if the charger is in input current regulation (IINDPM) throughout the whole charging cycle, and the safety time is set to 5 hours, the safety timer will expire in 10 hours. This feature can be disabled by writing 0 to REG07[6].

Thanks,

Ning.

Kuramoto,

Referring to 8.3.3.6 Charging Safety Timer on the d/s, In default mode, the device keeps charging the battery with 5-hour fast charging safety timer regardless of REG05[2:1] default value.

Thanks,

Ning.