OPERATIONAL MODES The second write is to ac" />
參數(shù)資料
型號(hào)： MCZ33797EKR2
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 15/36頁(yè)
文件大?。?/td> 0K
描述： IC SQUIB DRIVER 2CHAN 32-SOIC
標(biāo)準(zhǔn)包裝： 1,000
系列： *
應(yīng)用： *
接口： *
電源電壓： *
封裝/外殼： 32-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 32-SOIC
包裝： 帶卷 (TR)
安裝類型： 表面貼裝
Analog Integrated Circuit Device Data
22
Freescale Semiconductor
33797
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
The second write is to actually fire the desired driver. The four
most significant bits of the second write are used to establish
a parity with the four most significant bits of the first write. The
four least significant bits are the data bits, and each bit
represents a squib driver or squib driver pair. If there is a
parity mismatch of the four most significant bits, the data bits
will be ignored and the squib drivers will not have their status
changed. The 2-byte write sequence must then be started
again. During the first write, when the drivers are armed, all
diagnostic functions are cleared.
Once fired, a driver can only be turned off by one of the
following:
Sending a valid 2-byte write sequence through the shift
register.
Having the reset pin pulled low.
Having the thermal shutdown limit exceeded (once
minimum firing duration requirement has been met;
refer to Note (4) in Maximum Ratings).
Having the FEN pin pulled low. Note that the code
sequences allow any combination of drivers to be
turned on or off.
Once fired, the current limit measurement register
increments when the squib current is measured and is above
the IMEAS threshold during the timer activation.
The FEN_1 or FEN_2 pin must be high to enable firing of the
drivers. If fire command is active and the FEN (1 or 2) pin is
pulled low, the FET drivers will turn off (assuming the latch
and hold function is not in effect; refer to paragraph entitled
Command)). If fire command is active and the FEN (1 or 2)
pin is pulled high, the FET driver will turn on.
During the firing of a squib, significant IR losses may occur,
which could cause a voltage shift across a circuit board trace.
It is recommended that current paths for discharging the firing
supply storage capacitors through the squib be kept as short
as possible and isolated from logic and diagnostic grounds.
Table 7. Squib Firing Commands
Hex Code
Command Description
A0 ARM Squib Drivers 1A and 1B
A1 ARM Squib Drivers 2A and 2B
Byte #1
Byte #2
Squib B
High Side
Squib B
Low Side
Squib A
High Side
Squib A
Low Side
Squib 2B
Squib 2A
Squib 1B
Squib A1
A0
ARM Squib Drivers 1A and 1B
A1
ARM Squib Drivers 2A and 2B
A2
ARM Squib Drivers 1A, 1B, 2A, 2B
50
OFF
51
OFF
ON
OFF
ON
52
OFF
ON
OFF
ON
OFF
53
OFF
ON
OFF
ON
54
OFF
ON
OFF
ON
OFF
55
OFF
ON
OFF
ON
OFF
ON
OFF
ON
56
OFF
ON
OFF
ON
OFF
57
OFF
ON
OFF
ON
58
ON
OFF
ON
OFF
59
ON
OFF
ON
OFF
ON
5A
ON
OFF
ON
OFF
ON
OFF
ON
OFF
5B
ON
OFF
ON
OFF
ON
5C
ON
OFF
ON
OFF
5D
ON
OFF
ON
OFF
ON
5E
ON
OFF
ON
OFF
5F
ON
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