L9662 datasheet(44/80 Pages) STMICROELECTRONICS

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Functional description

L9662

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DocID028325 Rev 1

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 shall be ignored.

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

Table 20. Deployment mode 2 bit definition

Bit

MOSI command

MISO response

State

Description

D15

Mode bits

See above

D14

See above

D13

Odd Parity – Includes all 16 bits

D12 – D8

Arm pattern

See above

Channel 7 Idle (default)

Internal Deploy Status

Arm Channel 7

Channel 6 Idle (default)

Internal Deploy Status

Arm Channel 6

Channel 5 Idle (default)

Internal Deploy Status

Arm Channel 7

Channel 4 Idle (default)

Internal Deploy Status

Arm Channel 4

Channel 3 Idle (default)

Internal Deploy Status

Arm Channel 3

Channel 2 Idle (default)

Internal Deploy Status

Arm Channel 2

Channel 1 Idle (default)

Internal Deploy Status

Arm Channel 1

Channel 0 Idle (default)

Internal Deploy Status

Arm Channel 0

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