AS3715 datasheet(60/159 Pages) AMSOSRAM

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Page 59

[v1-03] 2015-Aug-10

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AS3715 − Detailed Description – System Functions

Power OFF

To put the chip into ultralow power mode, write ‘1’ into

power_off. The chip stays in power OFF mode until it gets a

wakeup signal from either the ON pin or from a charger insert.

For more details see the start-up flowchart (Figure 56). The bit

power_off is automatically cleared by this reset cycle. During

power_off state all circuits are shut-off except the Low Power

LDO (V2_5). Thus the current consumption of AS3715 is

reduced to about 13μA (if only supplied via VIBAT ). The digital

part is supplied by V2_5, all other circuits are turned OFF in this

mode, including references and oscillator. Except the reset

control registers all other registers are set to their default value

after power-ON.

Below table show the behavior of the PMIC in terms of USB

pre-regulator and battery switch operation supplying VSUP

when putting the PMIC into power_off state by setting

power_off=1

Figure 60:

Pre-Regulator and Battery Switch Operation

Pre-Regulator and Battery Switch Operation: Shows the VSUP behavior under different supply conditions and

settings when setting power_off=1.

Software Forced Reset

Writing ‘1’ into the register bit force_reset immediately starts a

reset cycle. The bit force_reset is automatically cleared by this

reset.

External Triggered Reset

If the pin XRES is pulled from high to low by an external source

(e.g. microprocessor or button) a reset cycle is started as well.

Over-temperature Reset

The reset cycle can be started by over-temperature conditions.

(see Supervisor)

Battery

USB

Present

chg_pwr_off_en

States of VSUP_CHG

don’t care

YES

PMIC enter power_off mode. Pre-regulator

powered down, VSUP_CHG not powered

don’t care

YES

PMIC enter power_off mode and power ON again.

VSUP_CHG powered by the pre-regulator

IBAT

attached

don't care

PMIC enter power_off mode. VSUP_CHG connected

to VIBAT via the internal battery switch

EBAT

attached

don’t care

PMIC enter power_off mode. VSUP_CHG not

powered

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