参数资料
型号: TLE6712
厂商: INFINEON TECHNOLOGIES AG
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO24
封装: PLASTIC, DSO-24
文件页数: 5/48页
文件大小: 386K
代理商: TLE6712
TLE 6712
Company Confidential
13
V 1.61 2001-07-13
Figure 6
Precise Squib Resistance Measurement: Functional Schematic
2.4.1.2 Squib Measurement with Safing Sensor and Buckle Switch
There is another way to measure
R
Squib, if a mechanical safing sensor (SS) with a resistor
(
R
S) are used in parallel. Instead of activating the higher measurement current the high-
side switch of a squib driver can be switched on via SPI: 7XXX
H. Now a current
determined by the resistor
R
S flows through the squib and is reported to MO and MSR.
For buckle switch measurement, an amplifier with a fixed gain of 2 is provided for
applications where a buckle switch with an internal 2 k
to 5 k resistor in parallel is
connected in series with the pretension squib. To detect a broken/failed buckle switch,
AES02722
I
MC A
SPI command
4XXX
H and
6XXX
H
V
Bo o s t
-
+
-
+
Low Side
OFF
High Side
ON/OFF
C
Sto re
15 to 33 V
FV12
Buckle
Switch
2-5 k
Squib
+
-
+
16
15
MCA
SQHx
SQLx
GNDLx
MO
MSR
5
10
V
CC5
R
MC A
4-6 k
Saving
Sensor
R
S
8 V
MUX
SPI command
6XXX
H
I
Bia s = 5 x I MC A
I
Ma in = M x I MC A
M = 16, 32 or 40
OpAmp1
A
1 =10 or 30
OpAmp3
OpAmp1
OpAmp2
A
2 =2
R
MSR
50
R
Sq u ib
Saving
Sensor
S
S
V
BAT
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