MIKROE Hall Current 10 Click is a compact add-on board that provides economical and precise AC or DC current sensing solutions. This board features the ACHS-7194, a fully integrated Hall-effect-based isolated linear current sensor designed for the current range of ±40A from Broadcom Limited. Inside ACHS-7194 is a precise, low-offset, linear Hall circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field that the differential Hall sensors convert into a proportional voltage, where after that, the user is given the option to process the output voltage as an analog or digital value. This Click board™ is suitable for AC or DC current-sensing in industrial, commercial, and communications systems.

Hall Current 10 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

DO NOT TOUCH THE BOARD WHILE THE EXTERNAL POWER SUPPLY IS ON!

Note: This Click board™ needs to be used by trained personnel only while applying high voltages. Special care should be taken when working with hazardous voltage levels.

Hall Current 10 Click as its foundation uses the ACHS-7194, a Hall-effect current sensor that sends an analog voltage proportional to the magnetic field intensity caused by the current flowing through the primary input conductor from Broadcom Limited. Without a magnetic field, the output voltage is half of the supply voltage. The ACHS-7194 can detect both DC and AC designed for the current range of ±40A. Device accuracy is optimized across the operating ambient temperature through the close proximity of the magnetic signal to the Hall sensors.

The thickness of the copper conductor allows the survival of the device at high overcurrent conditions. The terminals of the conductive path are electrically isolated from the signal leads. This feature enables the ACHS-7194 to be used in applications requiring electrical isolation without optoisolators or other costly isolation techniques.

The ACHS-7194 also has a ratiometric output that means it changes proportionally to the supply voltage. Just like that, the output voltage, analog signal, can be converted to a digital value using MCP3221, a successive approximation A/D converter with a 12-bit resolution from Microchip, using a 2-wire I2C compatible interface, or can be sent directly to an analog pin of the mikroBUS™ socket labeled as AN. Selection can be performed by onboard SMD jumper labeled as ADC SEL to an appropriate position marked as AN and I2C.

With the MCP3221, data transfers at rates of up to 100kbit/s in the Standard and up to 400kbit/s in the Fast Mode. Also, maximum sample rates of 22.3kSPS with the MCP3221 are possible in a Continuous-Conversion Mode with a clock rate of 400kHz.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VIO SEL jumper. This way, it allows both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

• Interface: Analog, I²C
• Compatibility: mikroBUS™
• Dimensions: 57.15 x 25.4mm
• Input Voltage: 3.3V or 5V
• Input Current Range: Min. -40A, Max. +40A
• Sensitivity: 50 mV/A
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +110°C

• Schematic
• ACHS-7194 Datasheet
• MCP3221 Datasheet
• mikroSDK
• GitHub