BQ25708 datasheet(30/94 Pages) TI2

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PROCHOT

Independent

Comparator

1.2 V

BQ25713/BQ25713B

CMPIN

VSYS

Voltage

Figure 9-3. PROCHOT Low Power Mode Implementation

9.3.9.2 PROCHOT Status

REG0x22[7:0] and REG0x23[0] reports which event in the profile triggers PROCHOT if the corresponding bit is

set to 1. The status bit can be reset back to 0 after it is read by host, when the current PROCHOT event is not

active any more.

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 10 ms PROCHOT pulse, if any of the PROCHOT

event is still active (either A or B), the PROCHOT pulse is extended.

9.3.10 Device Protection

9.3.10.1 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 REG0x01[6:5]). 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 REG0x01[6:5] = 00 to disable watchdog timer also resumes

charging.

9.3.10.2 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 is pulled high by external pull up resistor. The converter resumes if enable

conditions are valid.

9.3.10.3 Input Overcurrent Protection (ACOC)

If the input current exceeds the 1.33× or 2× (REG0x32[2]) of ILIM2_VTH (REG0x37[7:3]) set point, converter stops

switching. After 300 ms, converter starts switching again.

9.3.10.4 System Overvoltage Protection (SYSOVP)

When the converter starts up, BQ25713/BQ25713B reads CELL pin configuration and sets MaxChargeVoltage()

and SYSOVP threshold (1s – 5 V, 2s – 12 V, 3s/4s – 19.5 V). Before REGx05/04() is written by the host, the

BQ25713, BQ25713B

SLUSD83C – JUNE 2018 – REVISED MAY 2023

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BQ25708 Folha de dados(PDF) 30 Page - Texas Instruments