AS3709 datasheet(27/74 Pages) AMSCO

27 / 74 page

ams Datasheet, Confidential: 2013-Aug [1-02]

AS3709 – 27

Detaile d Desc rip t ion - S y st em Fu nc tions

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.

Long ON-key Press

When applying a high level on the ON input pin for 4s/8s

(depending on on_reset_delay) a reset is initiated. This is

thought as a safety feature when the SW hangs up.

Parameter

Figure 35:

XRES Input Characteristics

Figure 36:

RESET Levels

Symbol

Parameter

Note

Min

Typ

Max

Unit

VXRES_IL

RESET Low Level Voltage

0.4

VXRES_IH

RESET High Level Voltage

1.4

Symbol

Parameter

Note

Min

Typ

Max

Uni

VPOR

Overall Power On Reset

Monitor voltage on

V2_5

power on reset for

all internal functions

1.5

2.0

2.3

VRES_RISE

RESET Level for VSUP rising

Monitor voltage on

VSUP rising level

ResVoltRise (1)

VRES_FALL

RESET Level for VSUP

falling

Monitor voltage on

VSUP falling level

2.7

if SupResEn = 1 only

ResVoltFall (2)

AS3709 Datasheet(PDF) 27 Page - ams AG

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