33797 Datasheet, PDF (24/34 Pages) Freescale Semiconductor, Inc – Four Channel Squib Driver IC

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 8. Command Programming and Diagnostic Bit Definitions
Hex
Code
Command
Description
3X ^Current
Measurement
Register Reset
Command for
Squib X
Current 1 = ON
Command Programming Input and Diagnostic Data Out (Available on Next Command) ⁽²¹⁾
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
1
1
SQB_2B SQB_2A SQB_1B SQB_1A
Data / Timer Data / Timer Data / Timer Data / Timer
Reset
Reset
Reset
Reset
DATA OUT
0
0
1
1
SQB_2B SQB_2A SQB_1B SQB_1A
Squib X Current
Data / Timer Data / Timer Data / Timer Data / Timer
Register Reset
Reset
Reset
Reset
Reset
Status
80 ^{Unlock for FEN 1}
1
0
0
0
0
0
0
0
Counter Registers
Programming.
Response DATA
1
0
0
0
0
0
0
0
Output: Command
Echoed
XX ^Programming
Command for
FEN 1 Counter
1 = ON
FEN1 CNT FEN1 CNT FEN1 CNT FEN1 CNT
BIT 7
BIT 6
BIT 5
BIT 4
MSB
FEN1 CNT
BIT 3
FEN1 CNT FEN1 CNT FEN1 CNT
BIT 2
BIT 1
BIT 0
LSB
Response DATA
OUT
FEN 1 Counter
Programming
Status
FEN1 CNT FEN1 CNT FEN1 CNT FEN1 CNT
BIT 7
BIT 6
BIT 5
BIT 4
MSB
FEN1 CNT
BIT 3
FEN1 CNT FEN1 CNT FEN1 CNT
BIT 2
BIT 1
BIT 0
LSB
81 Unlock for FEN 2
1
0
0
0
0
0
0
1
Counter Registers
Programming
Response DATA
1
0
0
0
0
0
0
1
Output: Command
Echoed
Notes
21 The second byte for command programming will be treated as a NOP if any FET is firing. The programming commands have to be
sequential or they will be treated as a NOP.
33797
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Analog Integrated Circuit Device Data
Freescale Semiconductor