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參數(shù)資料
| 型號： | A3054 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Multiplexed Two-Wire Hall Effect Sensor(多路復用2線霍爾效應(yīng)傳感器) |
| 中文描述： | 復用兩線霍爾效應(yīng)傳感器（多路復用2線霍爾效應(yīng)傳感器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 87K |
| 代理商： | A3054 |
3054
MULTIPLEXED
TWO-WIRE
HALL-EFFECT SENSOR ICs
Bus Driver
It is recommended that the bus be controlled
by microprocessor-based hardware for the
following reasons:
Sensor address information may be stored
in ROM in the form of a look-up table.
Bus faults can be pinpointed by the
microprocessor by comparing the diagnos-
tic response to the expected response in
the ROM look-up table.
The microprocessor, along with an A/D
converter, can also be used to self cali-
brate the quiescent currents in the bus and
hence be able to easily detect a signal
response.
The microprocessor can also be used to filter out random line noise
by digitally filtering the bus responses.
The microprocessor can easily keep track of the signal responses
and initiate the appropriate action (e.g., light a lamp or sound an
alarm, and also pinpoint the location of the signal).
Optimally, the microprocessor is used to control bus-driving
circuitry that will accept TTL-level inputs to drive the bus and will return
an analog voltage representation of the bus current.
Interface Schematic
The bus driver is easily designed using a few operational amplifi-
ers, resistors, and transistors. Figure 4 shows a schematic of a
recommended bus driver circuit that is capable of providing 6 V to 9 V
transitions, resetting the bus, and providing an analog measurement of
the bus current for the A/D input of the microprocessor.
FIGURE 4
BUS INTERFACE SCHEMATIC
50 k
R
8
Dwg. EH-003A
1
3
2
1
3
2
+15 V
1 k
10 k
9 V
Z
1
20 k
R
5
5 k
5 k
ADDRESS
RESET
1 k
50
50 k
R
7
100 k
100 k
R
10
NC
SWITCH
BUS SUPPLY
BUS RETURN
X
X
ANALOG OUT
0.001
μ
F
R
9
R
6
Q
1
Q
2
R
4
OP
1
OP
2
Q
3
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