L9660 datasheet(36/49 Pages) STMICROELECTRONICS

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Functional description

L9660

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DocID024714 Rev 2

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 is 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 2 bits

are set in the fire command then the drivers on channel 0 are activated (assuming FEN

function is active) and there are no effect on channel 2.

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

ignored and the response shall be 0xD009.

Diagnostic commands

Diagnostic Mode

Diagnostic mode main functions are as follows:



Squib short to battery/ground diagnostics



Loop to loop diagnostics



Normal Squib Resistance Diagnostics



High Squib Resistance 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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