BQ25708 datasheet(24/77 Pages) TI1

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IADP

IDCHG

Ref_DCHG

Ref

CMPOUT

20 µs

Deglitch

10 ms

Debounce

VSRP

INOM

Adjustable

Deglitch

PROCHOT

ICRIT

CELL_BATPRESZ

(one shot on pin falling edge)

10 ms

1.05V

<0.3V

50 Ω

CHRG_OK

(one shot on pin falling edge)

bq25708

SLUSCU2 – NOVEMBER 2017

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•

ICRIT: adapter peak current, as 110% of ILIM2

•

INOM: adapter average current (110% of input current limit)

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IDCHG: battery discharge current

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VSYS: system voltage on VSYS

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Adapter Removal: upon adapter removal (CHRG_OK pin HIGH to LOW)

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Battery Removal: upon battery removal (CELL_BATPRESZ pin goes LOW)

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CMPOUT: Independent comparator output (CMPOUT pin HIGH to LOW)

The threshold of ICRIT, IDCHG or VSYS, and the deglitch time of ICRIT, INOM, IDCHG or CMPOUT are

programmable through SMBus. Each triggering event can be individually enabled in REG0x34[6:0]. When any

event in PROCHOT profile is triggered, PROCHOT is asserted low for minimum 10 ms programmable in

0x33[4:3]. At the end of the 10 ms, if the PROCHOT event is still active, the pulse gets extended.

Figure 9. PROCHOT Profile

8.3.7.1 PROCHOT During Low Power Mode

During low power mode (REG0x12[15]=1), the charger offers a low quiescent current (~150 uA) Low power

PROCHOT function uses the independent comparator to monitor battery discharge current and system voltage,

and assert PROCHOT to CPU.

Below lists the register setting to enable PROCHOT during low power mode.

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REG0x12[15]=1

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REG0x34[5:0]=000000

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REG0x30[6:4]=100

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Independent comparator threshold is always 1.2V

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When REG0x30[14]=1, charger monitors discharge current. Connect CMPIN to voltage proportional to IBAT

pin. PROCHOT triggers from HIGH to LOW when CMPIN voltage falls below 1.2V.

•

When REG0x30[13]=1, charger monitors system voltage. Connect CMPIN to voltage proportional to system.

PROCHOT triggers from HIGH to LOW when CMPIN voltage rises above 1.2V.

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