| MR003-006.2 | 1 |
This board carries the Allegro's ACS714ELCTR-05B-T hall effect-based linear current sensor, which offers a low-resistance (~1.2mΩ) current path and electrical isolation up to 2.1kV RMS.
The sensor operates at 5V and its analog voltage output has a sensitivity of 185mV/A centered at 2.5V with a typical error of ±1.5% and a 80kHz bandwidth.
Optimized bidirectional current range is from -5A to +5A, but its robustness allows survival of the device at up to 5× overcurrent conditions. Top silkscreen shows the direction that is interpreted as positive current flow.
The IC has an internal filter resistance of 1.7kΩ, and the carrier board includes a 1nF filter capacitor, which produces a low-pass RC filter with a 93,6kHz cutoff frequency.
You can improve sensing system accuracy for low-frequency sensing applictations by adding a capacitor in parallel with the integrated 1nF capacitor across the component pads labeled as CF (see notes on datasheet).
| Supply voltage | +5V |
| Supply current | 10mA typ. (13mA max.) |
| Current range | from -5A to +5A |
| Internal resistance | 1.2mΩ |
| Sensitivity | 185mV/A |
| Typical output error | ±1.5% |
| Operating temperature | -40°C / +85°C |
| Interface | Analog |
| Dimensions | 1.1” x 0.8”(27.9 x 20.3 mm) |
| Weight | 0.12 oz (3.5 g) |
±5A Linear Current Sensor test sketch
