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L9912 Datasheet(PDF) 7 Page - STMicroelectronics

Part # L9912
Description  Automotive vehicle conform car alternator regulator IC
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9912 Datasheet(HTML) 7 Page - STMicroelectronics

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DocID029639 Rev 2
7/84
L9912
List of figures
7
List of figures
Figure 1.
Low-side configuration 12 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 2.
High-side configuration 12 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 3.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4.
Pin connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5.
Internal resistor ladder on pin A+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 6.
VB overvoltage protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 7.
Internal resistor ladder on pin SENSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 8.
LIN/BSS transmit, receive timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 9.
External MOS short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 10.
High-side configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 11.
L interface in lamp drive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 12.
Lamp driver overcurrent protection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 13.
Flow chart of soft L switch-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 14.
Example of soft L switch-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 15.
Fault indicator lamp drive in alarm condition and key engaged . . . . . . . . . . . . . . . . . . . . . 35
Figure 16.
External high current lamp pre-driver circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 17.
RC pin connection on alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 18.
Squared signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 19.
Internal voltage reference for ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 20.
Temperature sensor output voltage vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 21.
Timing diagram of watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 22.
Typical watchdog refresh sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 23.
Persistent watchdog failure diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 24.
Thermal shutdown diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 25.
SPI timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Figure 26.
TQFP44 (10x10x1.0 mm exp. pad down) package outline. . . . . . . . . . . . . . . . . . . . . . . . . 80
Figure 27.
TQFP44 (6X6 pad size) PCB soldering pad footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81



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