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L9788 Datasheet(PDF) 249 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) 249 Page - STMicroelectronics

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background image
DS12308 Rev 4
249/264
L9788
Device behavior
263
A.4
Main relay scenario
Figure 102. Overcurrent OVC removed before VB present with KEY_IN high and Overcurrent OVC
removed before VB present with KEY_IN stays high
Figure 103. Overcurrent OVC permanent after VB present with KEY_IN high
GADG1512161248PS
KEY_IN
WK_IN_DET
WAKE_UP_EOT_DET
WAKE_UP_CAN_DET
PHOLD
MRD out
FAULT
Internal OVC flag
VB_IN
Power On Reset
VPRE
t
OVC removed before VB present with KEY_IN high
Key_Tfilter
I_LS_ovc_flt
KEY_IN
WK_IN
WAKE_UP_EOT_DET
WAKE_UP_CAN_DET
PHOLD
MRD out
FAULT
Internal OVC flag
VB_IN
Power On Reset
VPRE
t
OVC removed before VB present with KEY_IN stays high
Key_Tfilter
I_LS_ovc_flt
T_res
OVC flag keeps MRD off
during restart time
OVC flag keeps MRD off until
KEY_OFF and KEY_ON again
V
UV_VB_CP_OFF
V
UV_VB_IN
V
UV_VB_CP_OFF
V
UV_VB_IN
SCENARIO 12 - MRD -Overcurrent
SCENARIO 13 - MRD -Overcurrent
OVC
OVC
GADG1512161501PS
KEY_IN
WK_IN_DET
WAKE_UP_EOT_DET
WAKE_UP_CAN_DET
PHOLD
MRD out
FAULT
Internal OVC flag
VB_IN
Power On Reset
VPRE
t
OVC permanent after VB present with KEY_IN high
OVC
Key_Tfilter
I_LS_ovc_flt
T_res
T_res
I_LS_ovc_flt
V
UV_VB_CP_OFF
V
UV_VB_IN
V
UV_VB_CP_OFF
V
UV_VB_IN
SCENARIO 14 - MRD - Overcurrent



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