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參數(shù)資料
| 型號： | TLE6712 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | PLASTIC, DSO-24 |
| 文件頁數(shù)： | 2/48頁 |
| 文件大小： | 386K |
| 代理商： | TLE6712 |
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TLE 6712
Company Confidential
10
V 1.61 2001-07-13
2.4
Measurements
2.4.1
Squib Resistance Measurement
The squib resistance measurement module consists of several circuits and can be
addressed by the SPI commands 4XXX
H, 6XXXH and 7XXXH.
2.4.1.1 Precise Squib Resistance Measurement with the SPI Command
4XXX
H and 6XXXH
For a precise measurement the commands 4XXX
H and 6XXXH are used.
With the command 4XXX
H, two bias point measurements can be done. The combination
of the other two measurement eleminates the offset voltages of the OpAmp. The
command activates a bias current source of
I
Bias =5 x I
MCA. This current flows through
pin SQLx over the external resistor
R
MSR (Measurement Sense Resistor) to ground. The
pin SQLx is regulated to 8 V with the bias current.
The first measurements are used to eliminate the offset of OpAmp 1. Therefore bit b3
must be set to 0 and b2 to 0 (gain of OpAmp 1 is set to
A
1 = 10) or bit 3 to 0 and bit 2 to
1 (gain
A
1 = 30), see Chapter 3.4.1. Both inputs of the OpAmp 1 are set to its bias point
of 8 V, so that no current flows through the squib. The offset voltage
V
IO1 of OpAmp 1 is
amplified with the chosen gain factor
A
1 and reported to pin MO (Measurement Out), this
is illustrated in Figure 6.
The second measurement is done by the C A/D converter connected to the MSR pin to
determine the measurement current.
With the next two measurements the precise evaluation of the squib resistance will be
completed. In this case the SPI command 6XXX
H is used. The command 6XXXH
activates the second measurement current
I
Main. This current, IMain = M x IMCA (M = 16,
32 or 40 (set by the bits b6 and b5) see Chapter 3.4.1) flows through the squib
resistance. At the pin SQLx the currents
I
Bias and IMain are added and flow together
through the resistor
R
MSR to ground.
I)
10:
30:
V
IO1 offset voltage of OpAmp 1
A
1 gain of OpAmp 1 (10 or 30)
II)
VMO1
0.89
VCC5
×
() VIO1
–
A1
×
=
VMO1
0.86
VCC5
×
() VIO1
–
A1
×
=
VMSR1 IBias RMSR
×
=
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