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參數(shù)資料
| 型號： | MC33797 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Four Channel Squib Driver IC |
| 中文描述： | 四通道爆管驅(qū)動IC |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 639K |
| 代理商： | MC33797 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
27
33797
FUNCTIONAL DESCRIPTION
PROTECTION AND DIAGNOSIS FEATURES
pulled above the maximum threshold, a “Short to Battery” will
be indicated.
SQUIB SHORT-TO-BATTERY/GROUND
DIAGNOSTIC DATA RESULTS
If SQB_LO_XX, SQB_HI_XX, or SENSE_XX terminal is
shorted to battery, the bit NO_SH_BATT will be set to “0”. If
a SQB_LO_XX, SQB_HI_XX, or SENSE_XX terminal is
shorted to ground, the bit NO_SH_GND will be set to “0”.
During standard operation, both NO_SH_BATT and
NO_SH_GND will be set to “1”.
Note This diagnostic circuit uses an internal 2.7 mA
current source connected to the SQB_HI_XX terminal as a
bias. If the SQB_LO_XX and SQB_HI_XX terminals have
any capacitance (due to discrete capacitors or parasitic
loading), the diagnostic condition will require a settling time
based on the RC time constant.
SQUIB HARNESS SHORT-TO-BATTERY/GROUND
DIAGNOSTICS WITH AN OPEN SQUIB ($C3
COMMAND)
This diagnostic function is to be used with no squib present
(open squib condition) in the wiring harness. For an open
squib condition, the function must monitor the voltage on the
SQB_HI_XX and SQB_LO_XX terminals for “Short to
Ground” and “Short to Battery” conditions.
This function monitors the voltage on the SENSE_XX
terminals. The voltage is compared to two thresholds
(minimum and maximum) and will provide two bits of data to
indicate if the terminal voltage is above, below, or in between
the predetermined threshold levels.
When enabled, a pair of opposing N-channel CMOS
transistors are activated, creating roughly a 500
resistance
between the SQB_HI_XX and SQB_LO_XX terminals
together.
A 2.7 mA current source located in the SQB_HI_XX
terminal is activated, sourcing current from the SQB_HI_XX
to the SQB_LO_XX terminal to the SENSE_XX terminal.
When resistive measurement legs to comparators located in
the SENSE_XX terminal are activated, a short to BAT/GND
fault can easily be detected. An external current path that
causes the SQB_LO_XX, SQB_HI_XX, or SENSE_XX
terminal to be pulled below the minimum threshold, will be
indicated as a “Short-to-Ground”.
If the SQB_LO_XX, SQB_HI_XX, or SENSE_XX terminal
has an external current path that causes the terminal to be
pulled above the maximum threshold, a “Short-to-Battery” will
be indicated.
SQUIB SHORT-TO-BATTERY/GROUND
DIAGNOSTIC DATA RESULTS
If SQB_LO_XX, SQB_HI_XX, or SENSE_XX terminal is
shorted to battery, the bit OPEN NO_SH_BATT will be set to
“0”. If a SQB_LO_XX, SQB_HI_XX, or SENSE_XX terminal
is shorted to Ground, the bit OPEN NO_SH_GND will be set
to “0”. During standard operation, both OPEN NO_SH_BATT
and OPEN NO_SH_GND will be set to “1”.
Notes
1. This diagnostic circuit uses an internal 2.7 mA current
source connected to the SQB_HI_XX terminal as a
bias. If the SQB_LO_XX and SQB_HI_XX terminals
have any capacitance (due to discrete capacitors or
parasitic loading) the diagnostic condition will require a
settling time based on the RC time constant.
2. With an OPEN NO_SH_GND or OPEN_NO_SH_BATT
indicated, the SQB_HI_XX or SQB_LO_XX line
contains the fault condition. The standard squib short-
to-battery/ground diagnostics ($C1) can be executed
to determine if the fault condition is on the SQB_HI_XX
terminal or the SQB_LO_XX terminal.
CONTINUITY TEST for the LOW-SIDE DRIVER
SQB_LO_XX CONNECTION ($C2 COMMAND)
(LOW-SIDE DRIVER CONTINUITY STATUS)
Low-side driver continuity is checked during the continuity
test diagnostics. This function is used to check continuity at
the SQB_LO_XX terminal connection. When enabled, a
2.0 mA current source located in the SQB_HI_XX terminal is
activated sourcing current from the SQB_HI_XX to the
SQB_LO_XX terminal.
For a standard connection, the SQUIB_LO_XX_CON bit
will be set to “1”. With an open circuit connection, the
SQUIB_LO_XX bit will be set to “0”. The driver continuity
information will be cleared after the information is transmitted
on the next valid SPI command.
SQUIB RESISTANCE DIAGNOSTICS ($D0–$D3
COMMAND)
This function monitors squib resistance. When enabled, a
diagnostic current derived from R_DIAG is passed through
the selected squib. The resulting voltage across the squib is
amplified and passed to an 8-bit voltage level detector. The
eight bits of data will indicate if the selected squib has a
resistance value above or below predetermined thresholds.
The value of R_DIAG can be varied to allow the detection
range to be altered. Increasing the value of R_DIAG will
reduce the diagnostic current; thus, a higher squib resistance
will be needed to reach the same RTH points. In the case that
R_DIAG is a short-to-ground, the diagnostic current through
the squib resistance will typically be less than 50 mA.
SQUIB RESISTANCE DIAGNOSTIC DATA
RESULTS
A comparator result bit set to “1” indicates that the input
voltage is above the threshold resistance for that bit. Thus an
open squib would cause all bits to be set to “1”; likewise, a
shorted squib will cause all bits to be set to “0”.
Squib resistance tests are disabled during firing.
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