AS3722 datasheet(49/198 Pages) AMSCO

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ams Datasheet

Page 49

[v1-01] 2015-Sep-07

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AS3722 − Detailed Descriptions- System Functions

Figure 49:

Start-Up Flow Chart 2/2

Start-Up Flow Chart 2/2: Shows the main state transitions during operation and stand-by

power_off=1 OR

Die temp>140°C

OR THERM=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 expect:

ac_ok_pwr, rtc_on,

lid_pwr_on,

pwr_off_at_vsu p_low

RUN startup sequence

regulator startup sequnece GPIO

programming during seque nce

star tup de lay pro grammable

set sdX_sequ_on=1 or

ldoX_sequ_on=1 if regulator

selecte d d uring startup

RESET Timer

regulator startup executed

waiting time to release XRE S pin

10..150ms

ACTIVE state

XRES=1

soft_reset=1

XRES is low

or force_reset=1 or

VSUP<VSUP_min or

VBAT<ResVoltFall or

emergency_pd=1 or

ONKEY lpress or

standby_mode_on=1

or GPIOx=1 if GPIOx_iosf=6

or (ENABLE1=0 and

enable1_deepsleep=1)

OFF delay

wait off_delay if

ena ble1_ena ble=0 or wait

until (ENABL E1=0 if

ena ble1_dee psl eep=1)

force_reset=1 or

or (XRES is low

if stdby_reset_disable=0)

or VBAT<ResVoltFall or

VSUP<VSUP_min or

emergency_pd=1

power down

Sequence Down

has to be written to E0-F3h

before entering stand-by;

reg0_select_stby to

reg9_select_stby

keep regu lators on if

regX_stby_on=1,

force re gulator vo ltage to

regX_voltage_stby;

„force o ff“ all othe r re gulators

STAND-BY state

V2_5 power up

all regu lators with

regX_stby_on=1 ena lbed

power

down?

power

down?

any

interrupt applied or

if enable1_deepsleep=1

(ENALBE1=1 or lid_int

or ac_ok_int)

power

down?

VSUP debounce state

XINT=0

if an interrupt occured

remove „stand-by force off“

of all regulators

Sequence Up

reg9_select_stby to

reg0_select_stby

remove regX_voltage_stby

force (orig inal voltag e selection

used)

Sequence Down

Switch OFF regulators

where sdX_sequ_on=0 or

ldoX_sequ_on=0 then

write 00h to registers

add ressed by reg17_sel down

to reg0_sel

Power Off state

THERM=1

Die temp>140°C

VSUP_lo_deb=1

VBAT_lo_deb=1

bat_ov_deb=1

emergency power down

em_shutdown

_direct = 1

emergency

power down?

emergency

power down?

power_off=1

emergency_pd=1

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