L9679P datasheet(189/272 Pages) STMICROELECTRONICS

Teilenummer	L9679P

Bauteilbeschribung	Automotive advanced airbag IC for mid/high end applications

PDF	272 Pages

Scroll/Zoom	100%

Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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189 / 272 page

DocID029275 Rev 1

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L9679P

DC sensor interface

271

Another control (DCS_PAD_V bit in SYS_CFG register) is preprogrammed to select either a

voltage measurement or a current measurement on DCS0 for this purpose.

The automated control of the PSINHINT signal occurs when the microcontroller runs

diagnostic testing of the DCS0 interface. A 1 second timer is included to ensure the

diagnostic test is run periodically. When the timer expires (down-counts to 0), the PSINHINT

signal is asserted. When the measurement of the DCS0 voltage or DCS current (as selected

by the DCS_PAD_V bit) is taken, and the value falls within the preprogrammed window, the

timer will be reloaded. If the measurement is outside the window, the timer will not be

reloaded, and it will continue to count down until it expires, resulting in activation of

PSINHINT. For testing purposes, the PSINHINT can be controlled directly via SPI while in

DIAG state using the Diag State Test Selection (DSTEST) register.

L9679P Datenblatt(PDF) 189 Page - STMicroelectronics