L9660 datasheet(31/49 Pages) STMICROELECTRONICS

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L9660

Functional description

The squib circuits can be reset over when sending the appropriate configuration commands

via SPI.

Configuration commands

Configuration mode 1

Configuration mode 1 main functions are as follows:



Set Deployment current for all channels. All channels are either set to 1.2A/2ms,

1.5A/2ms (Maximum VRESx Voltage limited to 25V) 1.75A/1ms or 1.75A/0.65ms



Perform a software reset

The SPI message definition for MOSI commands and MISO responses in this mode are

defined below.

Table 15. Command description summary

Command/mode

Description

Mode bits

D15 D14 D13 D12 D11 D10 D09 D08 D07 - D00

Configuration commands

Config. Mode 1

Current limit programming and

software reset

Config. Mode 2

FEN latch time Programming

Deployment commands

Deployment Mode 1 Arming Command

1001

Deployment Mode 2 Firing Command

0000

Diagnostic commands

Diagnostic Mode 1

Disable Diagnostic

Diagnostic Mode 2

Short to battery & ground

diagnostics Short between loop

diagnostics

001

Diagnostic Mode 3

VRESx voltage diagnostics

Diagnostic Mode 4

High Side Safing diagnostics

Diagnostic Mode 5

Squib Resistance Diagnostics

Diagnostic Mode 6

High Squib Resistance Diagnostics

Diagnostic Mode 7

LS driver diagnostics

Diagnostic Mode 8

HS driver diagnostics

Monitor commands

Monitor Mode 1

Deployment status

Monitor Mode 2

Channel current limit measurement

information

Monitor Mode 3

FENx function status and active

current limit status

Monitor Mode 4

Revision and

L9660 ID

P = Parity bit – all commands and responses use this bit to achieve odd parity

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