VCT Monitor Click is a compact add-on board that contains a highly integrated monitoring solution without compromising accuracy. This board features the LTC2990, an I2C configurable high-performance temperature, voltage, and current monitor from Analog Devices. The LTC2990 incorporates a 14-bit ADC and a 10ppm/°C voltage reference to provide sub-millivolt voltage resolution, as well as +1°C accuracy internally and +0.5°C accuracy remotely when making temperature measurements. This Click board™ is suitable for applications like supply voltage monitoring and remote diode temperature measurement, e.g., in industrial systems where thermal management is crucial for maximizing performance.

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

VCT Monitor Click is based on the LTC2990, a high-performance temperature, voltage, and current monitor with the I2C serial interface from Analog Devices. The LTC2990 can be configured to measure many combinations of internal temperature, remote temperature, remote voltage or current, and internal VCC with single or repeated measurements. It fits in systems needing sub-millivolt voltage resolution, 1% current measurement, and 1°C temperature accuracy or any combination of the three.

The input signals are selected with an input MUX, controlled by the control logic block. The control logic uses the mode bits in the control register to manage the sequence and types of data acquisition. The control logic also controls the variable current sources during remote temperature acquisition. The ADC performs the necessary conversion(s) and supplies the data to the control logic for further processing in the case of temperature measurements or routing to the appropriate data register for voltage and current measurements.

Remote measurements are performed on terminals labeled as TEMP and LOAD using multiple ADC conversions and source currents to compensate for sensor series resistance. The LTC2990 is calibrated to yield the correct temperature for a remote diode with an ideality factor of 1.004.

This Click board™ is designed to be operated with both 3.3V and 5V logic voltage levels that can be selected via VCC SEL jumper. This allows for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the Click board™ comes equipped with a library that contains 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
• Supply Voltage: Min. -0.3V, Max. 6V
• Accuracy (Local): ±3.5°C
• Accuracy (Remote): ±1.5°C
• Resolution: 14 bits
• Operating Temperature Range: Min. 0°C, Max. 70°C

• Schematic
• mikroSDK
• LibStock