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L9679P データシート(PDF) 44 Page - STMicroelectronics

部品番号 L9679P
部品情報  Automotive advanced airbag IC for mid/high end applications
PDF  272 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P データシート(HTML) 44 Page - STMicroelectronics

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Start-up and power control
L9679P
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DocID029275 Rev 1
Figure 18. ER ESR measurement timing diagram
The ER CAP ESR can be calculated according to the following formula:
ESRERCAP
VC VB
–
GER_ESR IER_DISCHARGE_HIGH
-----------------------------------------------------------------------------------------
OFFER_ESR
+
=
6.6
ER switch and COVRACT pin
L9679P allows the system to run out of the reserve capacitor energy stored on VER node by
means of the charging boost regulator. In this way, an extended operation can take place
even in case of battery lost. The ER switch implements a connection from the VER pin to
the VIN node, supply input for the SYNCBOOST regulator and for internal power supplies.
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 VER_SW_OV_TH. The ER switch is automatically deactivated upon the
above mentioned overvoltage detection.
During PASSIVE mode the discrete digital output pin COVRACT is activated to allow for
external optional cross-over switch control (except during VINGOOD blanking state, where
the COVRACT is deactivated).



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