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L9678P Datasheet(PDF) 30 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag IC
PDF  203 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 30 Page - STMicroelectronics

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Start-up power control
L9678P, L9678P-S
30/203
DocID029274 Rev 3
4.3.3
ER switch and COVRACT pin
L9678P has an integrated circuit that can operate as a crossover switch with Rds(on) = 1.5 Ω
nominal. The ER switch is automatically activated upon entering the PASSIVE mode.
Voltage difference between VIN and VER is monitored in order to prevent VER back-feeding
when VIN exceeds VER by 0.1V max. The ER switch is automatically deactivated upon the
above mentioned overvoltage detection. The ER control implements a thermal protection
and a current limitation guard to avoid in-rush charge current at ER switch enabling or at
fault condition for short to ground. During PASSIVE mode the discrete digital output pin
COVRACT is activated to allow for external optional cross-over switch control.
Figure 13. ER switch control behaviour



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