L9659 datasheet(37/51 Pages) STMICROELECTRONICS

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L9659

Functional description

Doc ID 022048 Rev 2

37/51

The Deploy Status becomes ‘1’ when there is a valid fire sequence. Once active it will

become ‘0’ when the time out has expired waiting FEN activation or when squib driver has

turned off for fire completion. The same information is available when receiving a response

from Monitor Mode 1.

For the drivers to be fire capable the command mode 1 (Arming) must be sent followed by

command mode 2 (Firing). With this sequence valid and FEN active then firing will begin. A

break in the sequence will require the process to be restarted. All other bit patterns for D12-

D8 wil be ignored and the L9659 will respond with $D005.

To begin a deployment 2 consecutive commands need to be sent along with the FEN active

(external or internal latch). An example of a firing sequence for channel 0 would be as

follows

FENx active or inactive

TX – 0x5901 – ARM Channel 0

RX – Based on previous command

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 will 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

Channel 2 Idle (default)

Internal Deploy Status

Deploy Channel 2

Channel 1 Idle (default)

Internal Deploy Status

Deploy Channel 1

Channel 0 Idle (default)

Internal Deploy Status

Deploy Channel 0

Table 19.

Deployment mode 2 bit definition

Bit

MOSI command

MISO response

State

Description

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