Product description: current sensor ACS714
The module consists of a printed circuit board made for the system Allegro ACS714LLCTR-05B-T. The sensor operates based on the Hall effect. The chip can be powered from a voltage in the range: 4.5 V to 5.5 V.
Connection method of the current sensor ACS714
The sensor requires a supply voltage in the range from 4.5 V to 5 V, connected to the pins designated as VCC (+) and GND (ground). The output is a voltage signal proportional to the intensity of the measured current. When the voltage VCC is equal to 5 V, the output is centered on the half, that is 2.5 V. The output value increases by 66 mV at 1 A when the strength of the measured current is positive, otherwise, it decreases.
The main characteristics of the current sensor ACS714
- The system is designed for current flowing in both directions (from -30A to 30A)
- Due to the low resistance of the system (1.2 mΩ) and channeling, the power losses are very small.
- Through the use of Hall effect, the current paths are isolated from the logic part.
- The bandwidth is up to 80 kHz with the possibility of reduction by adding an additional condenser
- Precision of 1.5% at room temperature.
The chip has an internal resistance filter of 1.7 kΩ, the board has the condenser with the value of 1nF, which together form a low pass filter with cut-off frequency of 90 kHz. The user can change the filter when the capacitor is output onis called "filter". The limit frequency can be calculated by the formula:
F = 1 / (2πRC) = 1 / (11kΩ * (1 nF + Cf))
where Cf is the capacitance of the capacitor soldered into the "filter" pins.
Technical characteristics of the current sensor ACS714
- Supply voltage of the logic part: 4.5 V to 5.5 V
- Current consumption of the logic part: 13 mA
- Sensitivity for power supply of 5 V: 0,066 V/A
- Weight of the module - 1.3 g
- Dimensions: 18 x 20.5 mm