產品說明0
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Grove - ±5A DC/AC Current Sensor 直流/交流電流傳感器 (ACS70331) (101020615)
DESCRIPTION
The Grove - ±5A DC/AC Current Sensor (ACS70331) is a high precision DC/AC current sensor based on ACS70331. The ACS70331EESATR-005B3 is Allegro’s high sensitivity,current sensor IC for <5 A current sensing applications. It incorporates giant magneto-resistive (GMR) technology that is 25 times more sensitive than traditional Hall-effect sensors to sense the magnetic field generated by the current flowing through the low resistance, integrated primary conductor.
The Grove - ±5A DC/AC Current Sensor (ACS70331) can measure both the DC current and the AC current up to 5A with a base sensitivity of 200mV/A.
Danger
The human body is forbidden to touch the module during the test, otherwise there is danger of electric shock.
危險
試驗期間禁止人體接觸模塊,否則有觸電危險。
FEATURES
- Support DC and AC load
- 1 MHz bandwidth with response time <550 ns
- Low noise: 8 mA(rms) at 1 MHz
- 1.1 mΩ primary conductor resistance results in low power loss
- High DC PSRR enables use with low accuracy power supplies or batteries (3 to 4.5 V operation)
- Analog output
Specification
Parameter | Value |
Supply voltage | 3.3V / 5V |
Operating ambient temperature | -40 – 85℃ |
Storage temperature | - 65°C – 125°C |
Working Voltage | <100V |
Current sensing range | 0 – 5A |
Sensitivity | 200mV/A(Typ.) |
Output interface | Grove Analog |
Input interface | Screw terminal |
Working Principle
There are two types of current sensing: direct and indirect. Classification is mainly based on the technology used to measure current.
Direct sensing:
Indirect seneing:
- Faraday's Law of Induction
- Magnetic field sensors
- Faraday Effect
The Grove - ±5A DC/AC Current Sensor (ACS70331) uses magnetic field sensors technology. And there are three kinds of Magnetic field sensors technology:
- Hall effect
- Flux gate sensors
- Magneto-resistive current sensor
The Grove - ±5A DC/AC Current Sensor (ACS70331) is based on the Magneto-resistive current sensor priciple, which is also known as GMR. A magneto-resistor (MR) is a two terminal device which changes its resistance parabolically with applied magnetic field. This variation of the resistance of MR due to the magnetic field is known as the Magnetoresistive Effect.
The internal construction of the ACS70331 QFN package is shown in Figure 2. The die sits above the primary current path such that magnetic field is produced in plane with the GMR elements on the die. GMR elements 1 and 2 sense field in the +X direction for positive IP current flow, and GMR elements 3 and 4 sense field in the –X direction for positive IP current flow. This enables differential measurement of the current and rejection of external stray fields.
The four GMR elements are arranged in a Wheatstone bridge configuration as shown in Figure 2 such that the output of the bridge is proportional to the differential field sensed by the four elements, rejecting common fields.
Pinout