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L9679P Scheda tecnica(PDF) 41 Page - STMicroelectronics

Il numero della parte L9679P
Spiegazioni elettronici  Automotive advanced airbag IC for mid/high end applications
PDF  272 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P Scheda tecnica(HTML) 41 Page - STMicroelectronics

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L9679P
Start-up and power control
271
Figure 14. ER discharge state diagram
6.5
ER CAP diagnostic
The L9679P IC contains a full integrated solution to check the connection, value and series
resistance of energy reserve capacitor independent from ER Cap leakage current and Boost
Voltage level.
6.5.1
ER CAP measurement
The IC contains two current generators used to charge and discharge the energy reserve
capacitor connected on ER pin. The simplified block diagram is shown in the figure below.
Figure 15. ER CAP measurement block diagram
To obtain an accurate ER CAP measurement, the VER voltage conversion must be required
when both current generators are off, namely no current flows through ER cap permits to
avoid ESR error contribution.



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