MIKROE Power Monitor Click is a compact add-on board that represents an ultra-precise power monitoring solution. This board features the INA228, a digital power monitor with a 20-bit delta-sigma ADC specifically designed for current-sensing applications from Texas Instruments. The INA228 reports current, bus voltage, temperature, power, energy, and charge accumulation while employing a precision ±0.5 % integrated oscillator, all while performing the needed calculations in the background. It can measure a full-scale differential input of ±163.84mV or ±40.96mV across a resistive shunt sense element, with common-mode voltage support up to +85V. This Click board™ is suitable for current-sensing applications in DC-DC converters, power inverters, telecom equipment, industrial measurements, and many more.

Power Monitor Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Power Monitor Click at its foundation uses the INA228, ultra-precise digital power monitor with a 20-bit delta-sigma ADC and I2C digital interface from Texas Instruments. It measures shunt voltage, bus voltage, and internal temperature while calculating the current, power, energy, and charge necessary for accurate decisions in precisely controlled systems. It can measure a full-scale differential input of ±163.84mV or ±40.96mV across a resistive shunt sense element connected on the onboard IN terminal alongside with common-mode voltage support up to +85V, which makes it well suited for both high-side and low-side current measurements.

The INA228 also measures the bus supply voltage through the VBUS terminal and temperature through the integrated ±1°C accurate temperature sensor, helpful in monitoring the ambient system temperature. Calculations for power, charge, and energy are performed in the background and do not add to the overall ADC conversion time. Also, the very low offset voltage and noise allow for use in mA to kA sensing applications and provide a wide dynamic range without significant power dissipation losses on the sensing shunt element.

Power Monitor Click communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting a Fast Mode operation up to 400kHz. The INA228 also allows the selection of its I2C peripheral address using the two SMD cross-shape jumpers labeled as A0 and A1. One cross-shape jumper has four positions for select address pin, which can be connected to GND, VS, SCL, or SDA pins. This way, the INA228 provides the opportunity of the 16 possible different I2C addresses by positioning the SMD jumper to an appropriate position.

Besides, the INA228 also includes the multipurpose alert(interrupt) pin, labeled as ALR and routed to the INT pin of the mikroBUS™ socket, used to report multiple diagnostics or as an indicator that the ADC conversion is complete when the device is operating in both triggered and continuous conversion mode. The diagnostics such as shunt over/under voltage limit, bus over/under voltage limit, or temperature or power over-limit are constantly monitored and reported through the ALR pin whenever the monitored output value crosses its associated out-of-range threshold.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the I2C 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: I²C
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 3.3V or 5V, External
• Supply Voltage VCC: Min. 3.3V, Max. 5V
• Common-mode input Range VBUS: Min. 0V, Max. 85V
• Shunt Voltage Input Range IN: Min. -40.96mV / -163.84mV, Max. +40.96mV / +163.84mV
• Output Current: 10mA
• ADC Resolution: 20 bits
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +125°C

• Schematic
• INA228 Datasheet
• mikroSDK
• LibStock