Thermo 23 Click is a compact add-on board that provides an accurate temperature measurement. This board features the TMP144, a high-precision digital temperature sensor from Texas Instruments. The temperature sensor in the TMP144 is the chip itself, that houses temperature sensor circuitry, 12-bit analog-to-digital converter (ADC), a control logic, and a serial interface block in one package. Characterized by its high accuracy (up to ±0.5°C typical) and high resolution of 0.0625°C, this temperature sensor provides temperature data to the host controller with a configurable interface which can be seen as both UART or SMAART Wire™ interface. This Click board™ is appropriate for thermal management of various consumer, industrial, and environmental applications with many temperature measurement zones that need to be monitored.

Thermo 23 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Thermo 23 Click as its foundation uses the TMP144, a digital temperature sensor optimal for thermal management and thermal profiling applications from Texas Instruments. This temperature sensor is characterized by high accuracy; a temperature range of -10°C to +100°C provides typical ±0.5°C accuracy. The temperature sensing device for the TMP144 is the chip itself. A bipolar junction transistor inside the chip is used in a band-gap configuration to produce a voltage proportional to the chip temperature. The voltage is digitized and converted to a 12-bit temperature result in degrees Celsius, with a resolution of 0.0625°C.

The TMP144 possesses several operational modes: Continuous-Conversion mode (CC), Shutdown, One-shot mode, and Extended Temperature mode, which increases the temperature-measurement range from -40°C to +120°C. In the CC mode, ADC performs continuous temperature conversions and stores each result to the temperature register, overwriting the result from the previous conversion, while Shutdown modes reduce power consumption in the TMP75C when continuous temperature monitoring is not required, typically less than 0.5μA. Also, while the TMP144 is in Shutdown mode, it can perform a one-shot temperature measurement and return to the Shutdown state after the single conversion.

Thermo 23 Click communicates with MCU using the UART interface with commonly used UART RX and TX pins as its communication protocol operating at 115200bps by default configuration to transmit and exchange data with the host MCU. This interface can also be seen as both UART and SMAART Wire™ interface, supporting daisy-chain configurations. Besides, the interface also supports Multiple Device Access (MDA) commands that let the host communicate with multiple devices on the bus simultaneously.

This sensor's special and equally important feature is its software interrupt, a temperature alert function that monitors the device temperature and compares the result to the values stored in the temperature limit registers to determine if the device temperature is within these set limits. The TMP144 does not issue future interrupts until the user writes sets the interrupt enable bit in the configuration register to re-enable future interrupts.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.

• Interface: UART
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V
• Temperature Accuracy: Typ. ±0.5°C, Max. ±0.1°C
• Temperature Resolution: 0.0625°C
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +120°C

• Schematic
• TMP144 Datasheet
• mikroSDK
• LibStock