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L9678P датащи(PDF) 22 Page - STMicroelectronics

номер детали L9678P
подробное описание детали  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P датащи(HTML) 22 Page - STMicroelectronics

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Start-up power control
L9678P, L9678P-S
22/216
DS11626 Rev 9
4.2
Power mode control
Start-up and power down of the L9678P 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 3. The descriptions include references to conditions and sometimes nominal values.
The absolute values for each condition are listed in the electrical specifications section.
Figure 3. Power control state flow diagram
ACTIVE MODE
POWER-OFF MODE
(all supplies disabled)
PASSIVE MODE
SLEEP MODE
WAKE_UP >
WU_on
POWER
OFF
state
WAKEUP
MONITOR
state
AWAKE
State
STARTUP
state
RUN
state
ER
state
WAKEUP >
WU_mon
From any state
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
POWER
MODE
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
TwakeupTimer: cleared if (State = WAKEUP MONITOR or AWAKE) and WakeUpFilt=0
VBATmon > VBGOOD
(blanking time 10ms)



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