SLUSD89B February 2019 – November 2019 BQ25887
PRODUCTION DATA.
After REGN LDO powers up, the device checks the current capability of the input source. The input source has to meet the following requirements in order to start the boost converter.
If VBUS_OVP is detected (condition 1 above), the device automatically retries detection once the over-voltage fault goes away. If a poor source is detected (condition 2 above), the device repeats poor source qualification routine every 2 seconds. After 7 consecutive failures, the device sets VBUS_STAT[2:0] = '0b100', EN_HIZ = 1, and goes to HIZ mode. On BQ25887 adapter re-plugin and/or EN_HIZ bit toggle is required to restart device operation. The EN_HIZ bit is cleared automatically when the adapter is plugged in. If the fault is not removed, the part will enter HIZ mode again after the 7 consecutive failures.