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參數(shù)資料
| 型號(hào)： | A3054 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Multiplexed Two-Wire Hall Effect Sensor(多路復(fù)用2線霍爾效應(yīng)傳感器) |
| 中文描述： | 復(fù)用兩線霍爾效應(yīng)傳感器（多路復(fù)用2線霍爾效應(yīng)傳感器） |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 87K |
| 代理商： | A3054 |
3054
MULTIPLEXED
TWO-WIRE
HALL-EFFECT SENSOR ICs
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
In Figure 4, the ADDRESS input provides a TTL-compatible input
to control the bus supply. A HIGH (5 V) input switches Q
1
ON and sets
the bus voltage to 6 V through the resistor divider R
4
, R
5
, and Zener
Z
1
. A LOW input switches Q
1
OFF and sets the bus voltage to 9 V
(Z
1
). This voltage is fed into the positive input of the operational
amplifier OP
1
and is buffered and made available at BUS SUPPLY (or
sensor supply). Bus reset control is also available in the form of a TTL-
compatible input. When the RESET input is HIGH, Q
2
is switched ON
and the positive input of the operational amplifier is set to the satura-
tion voltage of the transistor (approximately 0 V). This resets the bus.
A linear reading of the bus current is made possible by amplifying
the voltage generated across R
6
(which is I
BUS
R
6
). The amplifier,
OP
2
, is a standard differential amplifier of gain R
9
/R
7
(provided that R
7
= R
8
, R
9
= R
10
). The gain of the total transim-pedance amplifier is
given by:
V
OUT
= I
BUS
R
6
R
9
/R
7
This voltage is available at the ANALOG OUT terminal.
Bus Control Software
The processing of the bus current (available at ANALOG OUT) is
best done by feeding it into the A/D input of a microprocessor. If the
flexibility provided by a microprocessor is not desired, this signal could
be fed into threshold detection circuitry; e.g., comparator, and the
output used to drive a display.
Related References
1. G. AVERY, “Two-Terminal Hall Sensor,” ASSIGNEE: Sprague
Electric Company, North Adams, MA, United States. Patent number
4,374,333; Feb. 1983.
2. T. WROBLEWSKI and F. MEISTERFIELD, “Switch Status
Monitoring System, Single-Wire Bus, Smart Sensor Arrangement
There Of,” ASSIGNEE: Chrysler Motor Corporation, Highland Park, Ml,
United States. Patent number 4,677,308; June 1987.
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