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L9788 Datasheet(PDF) 12 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) 12 Page - STMicroelectronics

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List of figures
L9788
12/264
DS12308 Rev 4
List of figures
Figure 1.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 2.
Pin connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 3.
Thermal simulation set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 4.
Power up state diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 5.
Timing for Wake Up Timer - driver by MSC start/stop commands . . . . . . . . . . . . . . . . . . . 33
Figure 6.
Timing for Wake Up Timer - activated (started) by KEY negative edge . . . . . . . . . . . . . . . 33
Figure 7.
Wake up timer block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 8.
Power hold diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 9.
Impulse timer clear WAKE_IN_DET after time out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 10.
Impulse timer disabled before time out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 11.
Timer enabled for a new detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 12.
SEO delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 13.
Reset table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 14.
Reset circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 15.
Reset matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 16.
RSTN/RSTC after run reset timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 17.
WDA block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 18.
WDA state flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 19.
Monitoring cycle diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 20.
Main relay low-side driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 21.
Power supply block diagram with pre-boost regulator and MRD . . . . . . . . . . . . . . . . . . . . 62
Figure 22.
Power supply block diagram with pre-boost regulator permanent VBAT . . . . . . . . . . . . . . 63
Figure 23.
Power supply block diagram with charge pump without pre-boost . . . . . . . . . . . . . . . . . . . 63
Figure 24.
Power supply block diagram with charge pump and MRD without pre-boost. . . . . . . . . . . 64
Figure 25.
Pre-boost block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 26.
Boost threshold comparator's schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 27.
Power up charge pump behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Figure 28.
Power down charge pump behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Figure 29.
Clock monitor block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Figure 30.
Low-side driver OFF state diagnosis schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 31.
Low-side driver OFF state diagnosis load thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 32.
Low-side driver OFF state fast pull up current behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 33.
Low-side driver OFF state diagnosis timings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Figure 34.
INJECTOR LowSide driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Figure 35.
O2 heater LowSide driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Figure 36.
O2 Heater LowSide driver current sense block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Figure 37.
Solenoid valves LowSide driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Figure 38.
Relay LowSide driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Figure 39.
LED LowSide driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Figure 40.
Configurable high/low -side Driver block schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Figure 41.
OFF state diagnostic HS config block schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Figure 42.
OFF state diagnostic HS config . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Figure 43.
High-side driver OFF state fast pull down current behavior . . . . . . . . . . . . . . . . . . . . . . . 110
Figure 44.
OFF state diagnostic high-side, timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Figure 45.
DELAY_OFF timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Figure 46.
DELAY_OFF timing terminated by MSC off command. . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Figure 47.
Safety switch off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Figure 48.
LS External MOSFET Pre-Driver Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122



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