L9662 datasheet(45/80 Pages) STMICROELECTRONICS

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L9662

Functional description

TX – 0x5901 – ARM Channel 0

RX – 0x5901

TX – 0x5901 – ARM Channel 0

RX – 0x5901

TX – 0x6001 – Firing on Channel 0 is started on if FEN is active

RX – 0x5901

TX – 0x6001 – Command ignored – sequence is not allowed

RX – 0x6001

TX – 0x6001 – Command ignored

RX – 0xD005

Alternatively, if the sequence is broken the response shall be as in the following example

FENx active

TX – 0x5901 – ARM Channel 0

RX – Based on previous command

TX – 0x2000 – Read of Register Mode 1

RX – 0x5901

TX – 0x6001 – Command ignored – sequence is not allowed

RX – contents of register

TX – 0x6001 – Command ignored – sequence is not allowed

RX – 0xD005

If, for example, channel 0 and 1 bits are set in the Arm command and channel 0 and 7 bits

are set in the fire command then the result will be the drivers on channel 0 will be activated

(assuming FEN function is active) and there will be no effect on channel 7.

During a deployment, any commands directed to the channel that are in deployment are

ignored and the response shall be 0xD009.

Diagnostic commands

Diagnostic Mode 1

Diagnostic mode main functions are as follows:



Normal Squib Resistance Diagnostics



High Squib Resistance Diagnostics



Squib short to battery/ground diagnostics



Loop to loop diagnostics



High side safing diagnostics



VRESx measurement



LS and HS FET Test

The SPI message definition for MOSI commands and MISO responses in Diagnostic Mode

are defined below.

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