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Traditionally, thermistors are used as temperature-sensing element in some applications. Nowadays, digital temperature sensors are widely used and eventually have replaced thermistors due to its high accuracy. This reference design uses TMP107 digital output temperature sensor that supports a total of 32 daisy-chained devices. Each sensor has a unique 5-bit address stored in electrically erasable programmable memory (EEPROM). The TMP107 is capable of reading temperatures with a resolution of 0.015625°C, and is accurate to within ±0.4°C in the range from –20°C to +70°C.

This reference design is specifically made for evaluating the performance of TMP107. This can be powered by a voltage supply within the range of 3.3V to 5.5V. It operates within a temperature range of –55°C to +125°C. This kit includes an USB-to-SMAART Wire interface and four TMP107 devices to evaluate in a daisy chain. The SMAART wire interface is a bidirectional UART, so only 3 conductors are needed between devices, which the TMP107EVM provides. The computer interface board has a solderless 3-lead connector to the cable so the included cable can be removed and a custom cable with up to 31 devices can be inserted with ease.

This device is very suitable to applications that require temperature sensing. Few of these include battery thermal protection, servers, telecommunication systems, building automation, HVAC, medical devices, and industrial process control. The TMP107 is ideal for extended temperature measurement in a variety of industrial, instrumentation, communication, and environmental applications.