SLUSDL9A June 2019 – January 2021 BQ25125
The input overvoltage protection protects the device and downstream components connected to PMID, SYS, and BAT against damage from overvoltage on the input supply. When VIN > VOVP an OVP fault is determined to exist. During the OVP fault, the device turns the battery discharge FET on, sends a single 128-µs pulse on INT, and the FAULT bits are updated over I2C. Once the OVP fault is removed, after the deglitch time, tDGL_OVP, STAT and FAULT bits are cleared and the device returns to normal operation. The FAULT bits are not cleared until they are read in from I2C after the OVP condition no longer exists. The OVP threshold for the device is set to operate from standard USB sources.
The input under-voltage status indication is used to notify the host or other device when the input voltage falls below a desired threshold. When VIN < VUVLO, after the deglitch time tDGL_UVLO, a UVLO fault is determined to exist. During the VIN UVLO fault, the device sends a single 128-µs pulse on INT, and the STAT and FAULT bits are updated over I2C. The FAULT bits are not cleared until they are read in from I2C after the UVLO condition no longer exists.