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L9788 Datasheet(PDF) 28 Page - STMicroelectronics

Part # L9788
Description  Multifunction IC for automotive engine management system
PDF  264 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9788 Datasheet(HTML) 28 Page - STMicroelectronics

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Operation behavior
L9788
28/264
DS12308 Rev 4
3
Operation behavior
3.1
Power up/down
3.1.1
Power up/down state diagram chart
The power up/down sequences are shown as state diagram in the following figure:
Figure 4. Power up state diagram
3.1.2
Power up sources and actions summary
KEY_DET=0 and WAKE_IN_DET=0 and WAKE_UP_EOT_DET=0 and WAKE_UP_CAN_DET=0 and PHOLD_TIMEOUT=OFF
or
or
or
or
or
OFF
POWER
UP
ON
POWER
DOWN
POWER ON RESET RELEASE
VPRE and VDD5
UNDERVOLTAGE
DETECTION OF
or
or
WAKE_UP_EOT (end of the counting of the EOT2 function gives WAKE_UP_EOT_DET=1)
or
WAKE_UP_CAN (pattern validated at CAN pins gives WAKE_UP_CAN_DET=1)
KEY=0
WK_IN=0
MRD_TIMEOUT EXPIRED (when system is not powered up by KEY)
KEY_DET=0 and
KEY=1 (high level on KEY pin after Key_Tfilter gives KEY_DET=1)
(low to high level on WK_IN pin gives WAKE_IN_DET=1)
MSC_WAKE_IN_RST=1 and WAKE_UP_EOT_DET=0 and WAKE_UP_CAN_DET=0 and PHOLD_TIMEOUT=OFF
KEY_DET=0 and
MSC_WAKE_UP_EOT_RST=1 and WAKE_UP_CAN_DET=0 and PHOLD_TIMEOUT=OFF
KEY_DET=0 and WAKE_IN_DET=0 and
PHOLD_TIMEOUT(EOT3)=EXPIRED
KEY_DET=0 and WAKE_IN_DET=0 and WAKE_UP_EOT_DET=0 and WAKE_UP_CAN_DET=0 and
(WAKE_IN_DET=1 or WAKE_UP_EOT_DET=1 or WAKE_UP_CAN_DET=1) and FIN_WAKE EXPIRED and PHOLD_TIMEOUT=OFF
KEY_DET=0 and
3V3 digital supply -derived from VB_IN -is present
MSC_WAKE_UP_CAN_RST=1
KEY_DET=0 and WAKE_IN_DET=0 and WAKE_UP_EOT_DET=0 and
and PHOLD_TIMEOUT=OFF
Watchdog PWR_CNT>7
GADG2411161158PS
Table 8. Power up sources and actions summary
KEY_IN
WK_IN
EOT
CAN_FD
VB_IN
MRD
Actions
active
-
-
-
not permanent
on
MRD on by KEY_IN pin
active
-
-
-
permanent
on
MRD on by KEY_IN pin
active
-
-
not permanent
on
MRD on by WK_IN pin
-
active
-
-
permanent
off
MRD used as normal low-side driver (is
controlled by MSC)
-
-
active
-
not permanent
on
MRD on by EOT
-
-
active
-
permanent
off
MRD used as normal low-side driver (is
controlled by MSC)



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