This board is a simple carrier of Broadcom’s bidirectional ±30A ACHS-7123 Hall effect-based linear current sensor, which offers a low-resistance (~0.7 mΩ) current path and electrical isolation up to 3 kV RMS. This version accepts a bidirectional current input with a magnitude up to 30 A and outputs a proportional analog voltage (66 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 V to 5.5 V and is intended for use in 5 V systems.
The conductive path internal resistance is typically 0.7 mΩ, and the PCB is made with 2-oz copper, so very little power is lost in the board.
Use of a Hall effect sensor means the IC is able to electrically isolate the current path from the sensor’s electronics (up to 3 kV RMS), which allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
80 kHz bandwidth that can optionally be decreased by adding a capacitor across the board pins marked “filter”.
High accuracy and reliability: typical total output error of ±1.5% at room temperature with factory calibration, an extremely stable output offset voltage, and almost zero magnetic hysteresis.
Robust sensor IC can tolerate 100 ms transient current spikes up to 100 A.
Wide operating temperature range of -40°C to 110°C.
Current sense: 0.066 V/A (when Vcc is 5V)
Minimum logic voltage: 4.5 V
Maximum logic voltage: 5.5 V
Supply current: 15 mA
Version: -30A to +30A