Accurately measure bidirectional current flows with MCR1101-20-5 and PIC18F57Q43

AMR Current Click is based on the MCR1101-20-5, an AMR-based integrated current sensor from ACEINNA. The device has superior range and accuracy (0.6% typical total error at 25°C) and 2.0% max error over temperature. It also features a Superior Frequency Response - 1.5 MHz (typically 3dB BW) and a Fast output response time (300ns typical) with a Low Primary Resistance (0.9 mΩ). The MCR1101-20-5 current sensor is factory-calibrated to achieve low offset error and provide a precise analog voltage output that is linearly proportional to the conduction current (AC or DC) with sensitivity (mV/A) compatible with A/D converters and analog control loops in power systems. The VOC pin is connected directly to VOC (Reset) pin on mikroBUS™. The voltage on this pin defines the overcurrent detection OCD threshold level. Briefly driving this pin to VCC resets and rearms OCD circuit. The AMR sensor device structure is designed to eliminate sensitivity to stray and common mode magnetic fields. Anisotropic magnetoresistance (AMR) uses a common material, Permalloy, to act as a magnetometer. Permalloy is an alloy containing roughly 80% nickel and 20% iron. The alloy's resistance depends on the angle between the magnetization and the direction of current flow. In

a magnetic field, magnetization rotates toward the direction of the magnetic field, and the rotation angle depends on the external field's magnitude. In a current sensor application, two of these resistors are connected in a Wheatstone bridge configuration to permit the measurement of the magnitude of the magnetic field produced by the current. AMR properties are well-behaved when the film's magnetic domains are aligned in the same direction. This configuration ensures high sensitivity, good repeatability, and minimal hysteresis. The film is deposited during fabrication in a strong magnetic field that sets the magnetization vector's preferred orientation, or "easy" axis, in the Permalloy resistors. AMR has better sensitivity than other methods and reasonably good temperature stability. The AMR sensor has a sensitivity that is approximately a linear function of temperature. The AMR Current has fast and accurate overcurrent fault detection circuitry. The overcurrent fault threshold (I ) is user-configurable via an external resistor divider (FLT INT) and supports a range of 120% to 200% of the full-scale primary input (IP). The sensor resistors are biased to the VCC supply voltage and produce a ratiometric differential voltage to VCC. This configuration is suited to applications where the

A-to-D or other circuitry receiving the current sensor output signals are biased by and ratiometric to the same supply voltage as the current sensor. The ratiometric configuration provides increased gain and resolution compared to fixed gain. The Click board detects the current by measuring the magnetic field generated by that current. Therefore it's important to consider the effect of externally generated magnetic fields, whether from another current flowing in the system, a magnet, or an electromagnetic component. The AMR Current click also features the MCP3221 AST, an A/D converter with a 12-bit resolution. This device provides one single-ended input with low power consumption. The AMR Current click can directly transfer the input from analog to digital because it contains the A/D converter. Also featured on the AMR Current click is the R7 resistor, which can be used if the communication goes directly to the mikroBUS™ device and is not used if you use the A/D converter (MCP3221 AST). This Click can be used for various purposes, including server, telecom & industrial PWR supplies, power aggregation, over-current protection, motor balance, remote device monitoring, and home automation control & IOT remote sensing.

PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive

mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI

GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.