AS3709 datasheet(25/74 Pages) AMSCO

25 / 74 page

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

AS3709 – 25

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

Figure 34:

Start-up Flowchart

Start-Up

VSUP connected

1. V2_5 power up

2. Readout ROM fuse

auto_off

= 1

POWER OFF state

V2_5 power up

Quiescent current < 10uA

Pin ON

debounce time=20msec

on_input

= 1

auto_off

= 1 or

power_off_at_vsuplow

VSUP debounce state

Measuring VSUP

Quiesent current ~200uA

VSUP > ResVoltRise

for more than 5ms

on_input

= 1

VSUP < ResVoltFall

for more than 500ms

power_off

= 1

OFF delay

wait off_delay

Reset all Registers

Switch off Regulators

reset registers and reload

fuses expect:

pwr_off_at_vsuplow

RUN startup sequence

regulator startup sequence GPIO

programming during sequence

startup delay programmable

RESET Timer

regulator startup executed

waiting time to release XRES pin

2..160ms

ACTIVE state

XRES = 1

standby_mode_on

= 1

or GPIOx = 1

if gpiox_iosf = 6

OFF delay

wait off_delay

STAND-BY state

V2_5 power up

all regulators with

sdX_stby_on

= 1 or

ldoX_stby_on

= 1 enabled

any

interrupt applied or

on_input

= 1

force_reset

= 1

or (XRES is low

if stdby_reset_disable = 0)

or VSUP < ResVoltFall or

tco_140_a

= 1

remove stand-by

force off of all

regulators

Die temp > 140°C

(tco_140_a = 1)

power_off

= 1

or force_reset = 1

or XRES is low or

VSUP < ResVoltFall or

tco_140_a

= 1 or

ON long-press

Die temp > 110°C

(tco_110_a = 1)

any state

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