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L9912 Datasheet(PDF) 52 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) 52 Page - STMicroelectronics

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Thermal shutdown
L9912
52/84
DocID029639 Rev 2
8
Thermal shutdown
Thermal shutdown is automatically accomplished by the Smart Power logic when the
junction temperature reaches 200 degrees.
The system is brought in a safe condition and the microcontroller is powered off for a tTSD
time interval to allow the system temperature to decrease
After the delay the microcontroller is powered again and will find bit 5 of SPI read register
0x12 set.
After 6 trials the system is definitively powered off and can be resumed, if possible, only with
a Power On Reset; the thermal shutdown reset counter can be read and cleared through the
relevant SPI register.
A thermal shutdown condition should never occur and the device SW should keep under
control the junction temperature and take the appropriate actions.
Figure 24. Thermal shutdown diagram
Table 34. Thermal shutdown electrical characteristics
#
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
1
Tsd
Thermal shutdown
Guaranteed by design
185
200
215
°C
2
Thyst
Hysteresis
-
3
6
9



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