AS3722 datasheet(49/199 Pages) AMSOSRAM

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[v1-01] 2015-Sep-07

AS3722 − Detailed Descriptions- System Functions

Start-Up

Figure 48:

Start-Up Flow Chart 1/2

Start-Up Flow Chart 1/2: Shows the main state transitions during start-up

Detailed Descriptions-

System Functions

Start-Up

VBAT rising

1. V2 _5 power up

2. Readout ROM fuse

wait 200ms for RTC startup ,

if RTC_ON =1

skip with any I 2C command

auto _off=1

POWER OFF state

V2_ 5 power up

RTC running if enabled

Quiescent current < 10uA

Pin ONKEY, LID, AC_OK

debounce time=20 msec

Exit power _off state ,

if vbat_is_alive=1

only

ONKEY=1 OR

RTC alarm OR

(LID =1 and lid _pwr_on and li _rising_en=0)

OR (lid_rise/fall and lid _pwr_on=1) OR

OR (ac_ok_rise/fall and ac _ok_pwr_on=1) OR

(AC _OK=1 and ac _ok _pwr_on and

ac_ok_rising_en=0)

OR RTC wakeup

bg_pd is 1 if

vbat_is_alive=0

Die Temp > 110°C

OR THERM =1

VSUP debounce state

Measuring VSUP , VBAT

Quiesent current ~200uA

NOBAT state

vbat_is not alive

vbat_is_alive

VBAT >ResVoltRise

VSUP>VSUP_min

auto _off=1 or

power _off_at_vsuplow =1

ON=1 or AC_OK=1

VBAT <ResVoltFall

or VSUP <VSUP_min for

more than 500ms

DCDC calibrate

calibrate currentsense

of SD0, SD1 and SD6

VBAT <ResVoltRise

VSUP<VSUP_min

once during calibrate

wait 1ms

Run startup sequence

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