BQ25713 datasheet(36/111 Pages) TI2

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Below lists the register setting to enable PROCHOT monitoring system voltage in low power mode.

• EN_LWPWR = 1b to enable charger low power mode.

• REG0x38[7:0] = 00h

• REG0x30[6:4] = 000b

• Independent comparator threshold is always 1.2 V

• When EN_PROCHOT_LPWR = 1b, charger monitors system voltage. Connect CMPIN to voltage

proportional to system voltage. PROCHOT triggers from HIGH to LOW when CMPIN voltage falls below

1.2 V.

PROCHOT

Independent

Comparator

1.2 V

CMPIN

VSYS

Voltage

Figure 8-5. PROCHOT Low Power Mode Implementation

8.3.20.2 PROCHOT Status

report 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 the 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.

8.3.21 Device Protection

8.3.21.1 Watchdog Timer

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

write ChargeVoltage() or write ChargeCurrent() command within 175s (default value and adjustable via

WDTMR_ADJ). When watchdog timeout occurs, all register values are kept unchanged except ChargeCurrent()

resets to 0 A . Write ChargeVoltage() or write ChargeCurrent() commands must be resent to reset watchdog

timer. Writing WDTMR_ADJ = 00b to disable watchdog timer or update new watchdog timer values can also

reset watchdog timer. New non-zero charge current value has to be written to ChargeCurrent() register to

resume charging after watchdog timer expires.

8.3.21.2 Input Overvoltage Protection (ACOV)

The charger has fixed ACOV voltage threshold with hysteresis. When VBUS pin voltage is higher than

VACOV_RISE for more than 100 μs, it is considered as adapter overvoltage. CHRG_OK pin will be pulled low

by the charger, and the converter will be disabled. As system falls below battery voltage, BATFET will be turned

BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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BQ25713 Datasheet(PDF) 36 Page - Texas Instruments