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L9788 Datasheet(PDF) 244 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) 244 Page - STMicroelectronics

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Device behavior
L9788
244/264
DS12308 Rev 4
A.3
Power up/down scenarios
Figure 92. Power up and power down with deglitch concept (not permanent battery)
Figure 93. Power up and power down with boost (permanent battery)
GADG1512160955PS
KEY_IN
WK_IN_DET
WAKE_UP_EOT_DET
WAKE_UP_CAN_DET
PHOLD
MRD out
VB_IN
Power On Reset
VPRE
VDD5
VTRK
RSTN
t
SCENARIO 1 - POWER UP by KEY detection
(with deglitch concept)
not permanent battery
Key_Tfilter
V
UV_VB_CP_OFF
Td_uv_rst
Vuv_vpre
Vuv_vdd5
Tuv_filter_vdd5
Tuv_filter_vpre
V
UV_VB_IN
t
(with deglitch concept)
not permanent battery
Note*: Power On Reset is activated at the end of power down sequence
without waiting for
V
UV_VB_CP_OFF
Vuv_vpre
Vuv_vdd5
Tuv_filter_vdd5
Tuv_filter_vpre
Key_Tfilter
KEY_IN
WK_IN
WAKE_UP_EOT_DET
WAKE_UP_CAN_DET
PHOLD
MRD out
VB_IN
Power On Reset
VPRE
VDD5
VTRK
RSTN
SCENARIO 2 -POWER DOWN during KEY detection
t
permanent battery
Key_Tfilter
Td_uv_rst
Vuv_vpre
Vuv_vdd5
Tuv_filter_vdd5
Tuv_filter_vpre
KEY_IN
WK_IN_DET
WAKE_UP_EOT_DET
WAKE_UP_CAN_DET
PHOLD
MRD out
VB_IN
Power On Reset
VPRE
VDD5
VTRK
RSTN
t
permanent battery
Vuv_vpre
Vuv_vdd5
Tuv_filter_vdd5
Tuv_filter_vpre
Key_Tfilter
KEY_IN
WK_IN
WAKE_UP_EOT_DET
WAKE_UP_CAN_DET
PHOLD
MRD out
VB_IN
Power On Reset
VPRE
VDD5
VTRK
RSTN
SCENARIO 3B - POWER DOWN during KEY detection
SCENARIO 3A - POWER UP by KEY detection
GADG1512160957PS



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