L9679P datasheet(29/279 Pages) STMICROELECTRONICS

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DS11627 Rev 7

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L9679P

Start-up and power control

278

6.2

Power mode control

Start-up and power down of the L9679P are controlled by the WAKEUP pin, VBATMON pin,

VIN pin, device status and the SPI interface. There are four main power modes: power-off,

sleep, active and passive mode.

Each power mode is described below and represented in the state flow diagram shown in

Figure 4. The descriptions include references to conditions and sometimes nominal values.

The absolute values for each condition are listed in the electrical specifications section.

Figure 4. Power control state flow diagram

GAPGPS02250

ACTIVE MODE

POWER-OFF MODE

(All supplies disabled)

PASSIVE MODE

SLEEP MODE

POWER

OFF

state

WAKEUP

MONITOR

state

AWAKE

State

WAKEUP >

WU_on

STARTUP

state

RUN

state

WAKEUP>

WU_mon

WAKEUP <

WU_mon

[(WAKEUP < WU_off) AND

(WakeUpFilt = 0)]

WakeUpFilt= 1

AND

VIN>VINGOOD

WakeUpFilt= 0

VIN<VINBAD

Twakeup > 9ms

WakeUpFilt= 1

AND

VIN<VINGOOD)

POWERMODE

SHUTDOWN

state

WakeUpFilt = 0

AND

SPI_SYS_CTL(SPI_OFF=1)

VIN < VINGOOD

WakeUpFilt = 0

AND SPI_SLEEP

WakeUpFilt = 0

AND SPI_SLEEP

WakeUpFilt= 1

AND

VIN>VINGOOD

POR

From

any state

Twakeup Timer: Cleared if (State = WAKEUP MONITOR or AWAKE ) and WakeUpFilt=0

VBATmon > VBGOOD

(blanking time 10ms)

VINGOOD

blanking

state

WakeUpFilt = 0

AND SPI_SLEEP

T > Tvingood_blk

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