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[v1-03] 2015-Aug-10

AS3715 − Detailed Description – System Functions

Reset Reasons

Reset can be activated from 8 different sources:

• VPOR has been reached (VSUP/VBAT rising from scratch)

• VSUP low, ResVoltFall (2.5V) has been reached

• Software forced reset by force_reset

• ONKEY or ENx long press has been detected

• External triggered through the pin XRES

• Over-temperature T140 (die)

• Over-temperature T140 SD4 (sub die)

• Watchdog

Voltage Detection:

There are two types of voltage dependent resets: VPOR and

VRESRISE. VPOR monitors the voltage on V2_5 and VRESRISE

monitors the voltage on VSUP. The linear regulator for V2_5 is

always ON and uses the voltage VUSB/VBAT/VSUP as its source.

The pin XRES is only released if V2_5 is above VPOR, VSUP is

above ResVoltRise.

VRESFALL is only accepted if the reset condition is longer than

VRESMASK. This guard time is used to avoid a complete reset of

the system in case of short drops of VBAT.

Figure 59:

VSUP Supervision

VSUP Supervision: Describes the behavior of the PMIC when VSUP drops below ResVoltFall depending on OTP

bit settings.

SupResEn

power_off_at_vsuplow

auto_off

Behavior if VSUP<ResVoltFall

LowBat interrupt is generated

Reset cycle is initiated, PMIC will move to “VSUP

debonce” state and start-up if

VSUP>ResVoltRise

Reset cycle is initiated, PMIC will move to “VSUP

debonce” state and try to start-up if

VSUP>ResVoltRise, if not it will go to the “Power

OFF” state

Reset cycle is initiated, PMIC will move to

“Power OFF” state

AS3715 数据表(PDF) 59 Page - ams-OSRAM AG

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