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参数资料
| 型号： | US1881LUA-AAA-000-BU |
| 厂商： | Melexis Technologies NV |
| 文件页数： | 30/46页 |
| 文件大小： | 498K |
| 描述： | IC LATCH CMOS MP TO-92UA |
| 产品目录绘图： | UA-92 Series Side |
| 标准包装： | 1,000 |
| 传感范围： | 9.5mT 跳闸，-9.5mT 释放 |
| 类型： | 双极卡锁 |
| 电源电压： | 3.5 V ~ 24 V |
| 电流 - 电源： | 5mA |
| 电流 - 输出（最大）： | 50mA |
| 输出类型： | 数字式，开漏极 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | TO-226-3，TO-92-3 短体 |
| 供应商设备封装： | TO-92UA |
| 包装： | 散装 |
| 产品目录页面： | 2792 (CN2011-ZH PDF) |
| 其它名称： | US1881LUA US1881LUA-ND |
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Measuring Flux Density
The Melexis Hall-Effect design kit is supplied with a linear Hal-Effect sensor which has been calibrated
to 1mV/G, making it very easy to build a circuit which will measure flux density. This is done with the
fully programmable MLX90215, programmed in this case to deliver exactly 2.5V at zero magnetic field
rising 1mV for every 1 Gauss applied.
If a field of 100 Gauss is applied, the output will increase 100mV. Similarly, if a field of -100 Gauss is
applied, the output will decrease 100mV. It is very important to maintain a regulated supply voltage of
5V because the output has no internal regulator and is ratiometric. The Hall IC's output is exactly V
DD
/2,
so if the supply voltage changes the output voltage also changes.
Figure 15, Flux Measurement
Figure 9 shows a circuit which allows the Voltmeter to be calibrated to read in units of Gauss. Shifting the
ground reference of the Voltmeter to exactly the quiescent voltage of the Hall IC makes the 2.5V VOQ
appear to be zero. The potentiometer allows this to be set to exactly zero. When a magnetic field is
applied, the DVM will display units of Gauss in a range of +/- 2000 Gauss. The resistor network is to
divide the output voltage by 10 so it can be measured by
200mV meter. If your meter is 2V range, this divider is not
used. This circuit can be built into a small case with a battery
and voltage regulator for a very inexpensive flux measuring
device.
With no divider used:
Full Scale: (2.00V)
+/-2000 Gauss
+/-200 mT
1 Gauss = 1mV
1 mT = 0.1mV
With 1/10 divider used:
Full Scale: (200mV)
+/-2000 Gauss
+/-200 mT
1 Gauss = 0.1mV
1 mT = 0.01mV
1mT = 10Gauss, exactly
Section 3 - Applications
3-16
MLX
90215
2501000
5V
+
1%
200 &
Potentiometer
2k
2k
zero adjust
9k*
1k*
Attach to
Voltmeter
1礔
.1礔
A-17
1/10
divider
(optional)
Output Voltage vs. Magnetic Flux Density
-200 -100 0 100 200
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
5.0
t
Flux Density (mT)
MLX
90215
2501000
DVM
2.00V Scale
.1礔
.1?F
5V
A-16
Figure 16, Flux
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