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.
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 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.
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