L9660 datasheet(35/49 Pages) STMICROELECTRONICS

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L9660

Functional description

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

‘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 begins. A

break in the sequence requires the process to be restarted. All other bit patterns for D12-D0

are ignored and the L9660 responds 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

Channel 0 Idle (default)

Internal Stored Value Arm bit

Arm Channel 0

Table 19. 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

Fire pattern

See above

Channel 3 Idle (default)

Internal Deploy Status

Deploy Channel 3

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 18. Deployment mode 1 bit definition

Bit

MOSI command

MISO response

State

Description

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