AS3701 datasheet(44/110 Pages) AMSOSRAM

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[v1-11] 2016-Dec-14

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AS3701 − Detailed Description – System Functions

Power OFF

During power OFF state all circuits are shut-OFF. Thus the

current consumption of AS3701 is reduced to about 1

μA. Except

the reset control registers, all other registers are set to their

default value after power-ON.

The chip stays in power OFF mode until

• The external pin ON is pulled high

• The charger is inserted or

• The VPOR level is touched to start a complete reset cycle.

The AS3701 can be set into Power OFF if one of the following

conditions occur:

• ResVoltFall was reached (VSUP < ResVoltFall [Battery_

voltage_monitor])

• Software forced power OFF (power_off [ResetControl] = 1)

• ON-key long press

• auto_off [Startup_Control] is enabled (VSUP rising from

the scratch)

Voltage Detection

If VSUP falls below ResVoltFall for longer than 500ms and the

bit power_off_at_vsuplow [Startup_Control] is set to “1”, the

PMIC enters the Power Off mode.

Figure 51:

Voltage Detection Power OFF

Software Forced Power OFF

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

[ResetControl]. In ON-key-switch configuration the AS3701 will

startup immediately again, if the switch is in ON position.

The bit power_off bit is automatically cleared by a startup and

its associated reset cycle.

SupResEn

power_off_at_vsuplow = 1

A power-down is initiated, if VSUP < 2.7V.

If enabled, an interrupt is executed at ResVoltFall.

Restart only possible with ON key or charger insertion, if VSUP > ResVoltRise.

A power-down is initiated, if VSUP < ResVoltFall.

Restart only possible with ON key or charger insertion, if VSUP > ResVoltRise.

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