L9678P datasheet(121/203 Pages) STMICROELECTRONICS

No. de pieza	L9678P

Descripción Electrónicos	Automotive user configurable airbag IC

PDF	203 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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DocID029274 Rev 3

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L9678P, L9678P-S

Deployment drivers

202

Figure 27. Deployment timer diagnostic sequence

Loop diagnostics control and results registers

Diagnostic tests and channels for each test are controlled through the Loop Diagnostic

Request Register (LPDIAGREQ), diagnostic results are stored in the Loop Diagnostic

Status Register (LPDIAGSTAT).

6.5.2

High level diagnostic approach

In this approach, the test steps described in the sections below are coded into a dedicated

state machine that helps reducing the user intervention to a minimum.

The high-level diagnostic commands are contained in the LPDIAGREQ, LOOP_DIAG_SEL,

and LOOP_DIAG_CHSEL registers. These settings are described in the SPI Table for these

commands in Read/write register.

The high-level diagnostic response is available in the LPDIAGSTAT register. These are

described in the SPI Table for this command in Read/write register.

The concept is depicted in the following figures.

L9678P Datasheet(PDF) 121 Page - STMicroelectronics