AS3715 datasheet(55/160 Pages) AMSCO

55 / 160 page

ams Datasheet, Confidential

Page 55

[v1-00] 2014-Sep-10

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AS3715 − Detailed Description – System Functions

Start-up

Figure 55:

Start-up flow chart

Start-up flow chart: Shows the main state transitions during start-up.

Detailed Description – System

Functions

power _off=1 OR

(VSUP<ResVoltFall &&

power _off_at_vsuplow ) OR

(onkey _lpress_reset=0 &&

ONKEY lpress )

OFF delay

wait off_delay

Reset all Registers

Switch off Regulators

reset registers and reload

fuses 0xA0 to 0xAB except:

pwr_off_at_vsup_low

RUN startup sequence

regulator startup sequnece GPIO

programming during sequence

startup delay programmable

set sdX_sequ_on=1 or

ldoX _sequ_on=1 if regulator

selected during startup

RESET Timer

regulator startup executed

waiting time to release XRES pin

10..150ms

ACTIVE state

XRES=1

standby _mode_on=1

or GPIOx =1 if

GPIOx _iosf=6

OFF delay

wait off_delay

Sequence Down

force off all regulators

not in the sequence;

sequence down inverse to

start-up sequence;

STAND-BY state

V2_5 stays active,

all regulators with

regX _stby_on=1 enabled

any

interrupt applied or

ONKEY=1 or

ENx=1

force_reset=1

or (XRES is low

if stdby _reset_disable=1)

or VSUP<ResVoltFall or

Die temp>140 °C

remove „stand -by force off“

of all regulators

Die

temp>140 °C

power_off=1

or force _reset=1

or XRES is low or

ONKEY lpress

OFF delay

wait off_delay

die temp

>110°C

any state

Start-Up

Battery or Charger insertion

1. V2_5 power up

2. Readout ROM fuse

auto _off=1

POWER OFF state

V2_5 power up

Quiescent current < 10uA

Pin ONKEY

debounce time=20msec

ONKEY=RISING OR

ENx=RISING OR

(chdet =1 && chg_pwr_off_en=0)

OR (chdet_rise &&

chg_pwr_off_en=1)

VSUP debounce state

Measuring VSUP

Quiesent current ~200uA

5ms &&

VSUP>ResVoltRise

auto_off=1 or

power _off_at_vsuplow =1

ONKEY=1 or

Charge detect =1

VSUP<ResVoltFall

for more than 500 ms

VSUP<ResVoltFall

or Die temp>140°C or

SD4 overtemp

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