BQ25708 datasheet(25/77 Pages) TI2

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PROCHOT

Independent

Comparator

1.2 V

bq25708

CMPIN

VSYS

Voltage

(

VSRN ± VSRP)

Voltage

bq25708

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SLUSCU2 – NOVEMBER 2017

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Figure 10. PROCHOT Low Power Mode Implementation

8.3.7.2 PROCHOT Status

REG0x21[6:0] reports which event in the profile triggers PROCHOT by setting the corresponding bit to 1. The

status bit can be reset back to 0 after it is read by host, and current PROCHOT event is no longer active.

Assume there are two PROCHOT events, event A and event B. Event A triggers PROCHOT first, but event B is

also active. Both status bits will be HIGH. At the end of the 10ms PROCHOT pulse, if PROCHOT is still active

(either by A or B), the PROCHOT pulse is extended.

8.3.8 Device Protection

8.3.8.1

Watchdog Timer

The charger includes watchdog timer to terminate charging if the charger does not receive a write

MaxChargeVoltage() or write ChargeCurrent() command within 175 s (adjustable via REG0x12[14:13]). When

watchdog timeout occurs, all register values are kept unchanged except ChargeCurrent() resets to zero. Battery

charging is suspended. Write MaxChargeVoltage() or write ChargeCurrent() commands must be re-sent to reset

watchdog timer and resume charging. Writing REG0x12[14:13] = 00 to disable watchdog timer also resumes

charging.

8.3.8.2

Input Overvoltage Protection (ACOV)

The charger has fixed ACOV voltage. When VBUS pin voltage is higher than ACOV, it is considered as adapter

over voltage. CHRG_OK will be pulled low, and converter will be disabled. As system falls below battery voltage,

BATFET will be turned on. When VBUS pin voltage falls below ACOV, it is considered as adapter voltage returns

back to normal voltage. CHRG_OK will be pulled high by external pull up resistor. The converter will resume if

enable conditions are valid.

8.3.8.3

Input Overcurrent Protection (ACOC)

If the input current exceeds the 1.25× or 2× (REG0x31[2]) of ILIM2_VTH (REG0x33[15:11]) set point, converter

stops switching. After 300 ms, converter will start switching again.

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