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L9679E Datasheet(PDF) 94 Page - STMicroelectronics

Part # L9679E
Description  Automotive battery cut-off circuit and airbag system expansion IC
PDF  127 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679E Datasheet(HTML) 94 Page - STMicroelectronics

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11
Temperature sensor
The L9679E provides an internal analog temperature sensor. The sensor is aimed at having a reference for the
average junction temperature on the silicon surface. The sensor is placed far away from power dissipating stages
and squib/pyroswitch deployment drivers. The output of the temperature sensor is available via SPI through ADC
conversion, as shown in Table 14. Diagnostics control register (DIAGCTRLx). The formula to calculate
temperature from ADC reading is the following one:
T(°C)=180− 2201.652 × ADCREF
2ADCRES×DIAGCTRLn(ADCRESn) −0.739 @DIAGCTRLn(ADCREQn)=0Aℎex
All parametric requirements for this block can be found in specification tables.
L9679E
Temperature sensor
DS12485 - Rev 8
page 94/127



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