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L9662 Datasheet(PDF) 44 Page - STMicroelectronics

Part # L9662
Description  Octal squib driver and quad Manchester/PSI5 encoded sensor
PDF  80 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9662 Datasheet(HTML) 44 Page - STMicroelectronics

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Functional description
L9662
44/80
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
0
Mode bits
See above
D14
1
See above
D13
Odd Parity – Includes all 16 bits
Odd Parity – Includes all 16 bits
D12 – D8
Arm pattern
See above
D7
0
Channel 7 Idle (default)
Internal Deploy Status
1
Arm Channel 7
D6
0
Channel 6 Idle (default)
Internal Deploy Status
1
Arm Channel 6
D5
0
Channel 5 Idle (default)
Internal Deploy Status
1
Arm Channel 7
D4
0
Channel 4 Idle (default)
Internal Deploy Status
1
Arm Channel 4
D3
0
Channel 3 Idle (default)
Internal Deploy Status
1
Arm Channel 3
D2
0
Channel 2 Idle (default)
Internal Deploy Status
1
Arm Channel 2
D1
0
Channel 1 Idle (default)
Internal Deploy Status
1
Arm Channel 1
D0
0
Channel 0 Idle (default)
Internal Deploy Status
1
Arm Channel 0



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