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L9679P bảng dữ liệu(PDF) 29 Page - STMicroelectronics

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L9679P bảng dữ liệu(HTML) 29 Page - STMicroelectronics

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DS11627 Rev 7
29/279
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
ER
state
WAKEUP>
WU_mon
WAKEUP <
WU_mon
[(WAKEUP < WU_off) AND
(WakeUpFilt = 0)]
WakeUpFilt= 1
AND
VIN>VINGOOD
WakeUpFilt= 0
OR
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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