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參數(shù)資料
| 型號(hào)： | 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(dòng)IC |
| 文件頁數(shù)： | 8/32頁 |
| 文件大?。?/td> | 639K |
| 代理商： | MC33797 |
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Analog Integrated Circuit Device Data
16
Freescale Semiconductor
33797
FUNCTIONAL DESCRIPTION
FUNCTIONAL TERMINAL DESCRIPTION
SQUIB DIAGNOSTIC 2A AND 2B (VDIAG_2)
Diagnostic terminals for the high-side safing sensors for
squibs 2A and 2B, as well as the VFIRE supply voltage.
SQUIB SENSE XX (SENSE_XX)
The Sense terminals are used exclusively for diagnostics
related to the squib, driver FETs, or harness. Commands
using the Sense terminals include:
C1, C2, C3, C9
D<3:0>
E<3:0>
E9
82/1x
83/2x
Independent of the system configuration, normal or cross
coupled, the Sense terminal, xx and SquibHi, xx of a single
IC are always connected to the same squib with the SquibHi
pin connected to the high terminal of the squib and the Sense
pin connected to the low terminal of the squib. A cross
coupled configuration is achieved by only cross coupling the
STANDARD APPLICATIONS
In the standard mode, the $C2 (SQUIB_LO_XX_CONT)
command will be used to check continuity of the low-side
driver from the SQB_LO_XX terminal to the high-side driver
FET (see Figure 7).
CROSS-COUPLED APPLICATIONS
Used during cross-coupling applications involving two
four-channel squib driver ICs (squib driver IC #1 and squib
driver IC #2). SENSE_XX terminals from squib driver IC #1
are connected to their respective squib minus terminals
(Squib Low/SQB_LO_XX) from squib driver IC #2 (Figure 8).
SENSE_XX terminals are used to feed diagnostic signals
back to squib driver IC #1 for determining squib resistance,
short-to-battery/ground, and squib loop-to-loop short
conditions. During a fire event, the fire current passes from
squib driver IC #1 high-side driver though the squib to squib
driver IC #2 low-side driver (Figure 8). In the cross-coupled
mode, the squib driver IC #2 $C2 (SQUIB_LO_XX_CONT)
command will be used to check continuity of the low-side
driver from the SQB_LO_XX terminal to the low-side driver
FET.
DESIGN NOTES
Diagnostics always have the form of a forcing function and
a measurement or sense function. In a cross couple
configuration, most diagnostics are unaffected and are single
commands except for $C2 Low Side FET Continuity and
$E<3:0> Harness Shorts, and 83/2x Low- Side FET test. This
command must be sent to each IC to be executed. For these
three diagnostics, two commands are required because the
forcing function and sensing function are on separate ICs.
Harness Shorts Diagnostics: Force using $E<3:0> on
IC#1, Sense $E8 on IC2
Low-Side FET Continuity: Force using $C1 on IC#1,
Sense using $C2 on IC#2
Low-Side FET Test: Force using $C1 on IC#1, Sense
using $C2 on IC#2
An active 600
A current sink is located in the SENSE_XX
terminal. The sink current is used to pull the charge off of the
external EMC/filter caps after a diagnostic measurement has
been made.
SQUIB HI XX (SQB_HI_XX)
Squib high terminals for squibs 1A, 1B, 2A, and 2B. These
terminals are connected to the sources of the high-side FET
drivers, as well as the diagnostic circuitry.
SQUIB LOW XX (SQB_LO_XX)
Squib low terminals for squibs 1A, 1B, 2A, and 2B. These
terminals are connected to the drains of the low-side FET
drivers, as well as the diagnostic circuitry.
SQUIB FIRING SUPPLY XX (VFIRE_XX)
Firing supply terminals for squibs 1A, 1B, 2A, and 2B.
These terminals are connected to the drains of the high-side
FET drivers. Feedback for high-side safing for squibs 1A and
1B will be referenced from VFIRE_1A and squibs 2A and 2B
from VFIRE_2A. For high-side safing, VFIRE_1B should be
connected to VFIRE_1A terminal and VFIRE_2B to
VFIRE_2A terminal.
SQUIB FIRE POWER GROUND (VFIRE_RTN)
Return for squibs 1A, 1B, 2A AND 2B. The terminals are
tied to the source terminals of both low-side FET drivers, as
well as the diagnostic circuitry. The RTN terminals are tied
internally.
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