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L9678P Datasheet(PDF) 170 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 170 Page - STMicroelectronics

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Temperature sensor
L9678P, L9678P-S
170/216
DS11626 Rev 9
14
Temperature sensor
The L9678P provides an internal analog temperature sensor. The sensor is aimed athaving
a reference for the average junction temperature on 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 11.
The formula to calculate temperature from ADC reading is the following one:
@ DIAGCTRLn(ADCREQn) = 0Ahex
All parametric requirements for this block can be found in specification tables.
T C
180
220
1.652
---------------
ADCREF_hi
2
ADCRES
------------------------------- DIAGCTRLn ADCRESn
0.739
–
–
=



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