L9680 datasheet(195/277 Pages) STMICROELECTRONICS

Part #	L9680

Description	Automotive advanced airbag IC for mid/high end applications

PDF	277 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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195 / 277 page

DocID029257 Rev 1

195/277

L9680

DC sensor interface

276

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.

L9680 Datasheet(PDF) 195 Page - STMicroelectronics