Temp Probe Click Board™

Product Code: MIKROE-4301

How Does The Temp Probe Click Board™ Work? The Temp Probe Click Board™ is based on the LTC2986, a high accuracy thermocouple temperature monitoring system with 0.1°C accuracy and 0.001°C resolution from Analog Devices. The LTC2986 simultaneously measures the thermocouple output and the cold junction temperature and performs all required calculations to report the thermocouple temperature in °C or °F. It combines high accuracy with the simple operation composed of five states: Start-Up, Channel Assignment, Initiate Conversion, Conversion, and Read Results. It works with ground-referenced sensors without the need for amplifiers, negative supplies, or level shift circuitry where signals are simultaneously digitized with three, high accuracy, 24-bit Δ-Σ ADCs using an internal 15ppm/°C reference. Thermocouples can measure temperatures from –265°C to more than 1.800°C, generating a voltage as a function of the temperature difference between the tip (thermocouple temperature) and the electrical connection on the circuit board (cold junction temperature).

In order to determine the thermocouple temperature, an accurate measurement of the cold junction temperature is required, known as cold junction compensation. The LTC2986 preforms automatic thermocouple cold junction compensation using any type of external sensor. The onboard PCC-SMP connector is a perfect solution for bringing thermocouple probes to the PCB, suitable for all K-type probes. To use the Temp Probe Click Board™ you need to connect the appropriate K-type thermocouple probe, which is not included in the package, into the PCC-SMP connector. Type-K thermocouple with glass braid insulation, available in our store, is used for precision measurements of high temperatures allowing this Click board™ to measure temperature up to 480°C (900°F). The Temp Probe Click Board™ communicates with MCU using the SPI serial interface with a maximum SPI frequency of 2 MHz. The interrupt pin routed on the INT pin of the mikroBUS™ socket is utilized by LTC2986 to signal when the device is busy either during Start-Up or while a conversion cycle is in progress. Alongside this feature, this Click board™ also has a Reset function routed on the RST pin of the mikroBUS™ socket that will put the LTC2986 into the reset state by driving the RST pin LOW. Once this pin is returned HIGH, the device initiates its Start-Up sequence. The Temp Probe Click Board™ is designed to operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. It allows for both 3.3V and 5V capable MCUs to use the SPI communication lines properly. However, the Click board™ comes equipped with a library that contains easy to use functions and an example code which can be used, as a reference, for further development. SPECIFICATIONS Type Temperature & humidity Applications Can be used for temperature-monitoring applications such as direct thermocouple measurements. On-board modules The Temp Probe Click Board™ is based on the LTC2986, a high accuracy thermocouple temperature monitoring system with 0.1°C accuracy and 0.001°C resolution from Analog Devices. Key Features High accuracy, directly digitizes, automatic thermocouple cold junction compensation, short-circuit and fault detection, and more. Interface SPI Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the Temp Probe Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NC Reset RST 2 RST INT 15 INT Interrupt SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC SPI Data OUT SDO 5 MISO SCL 12 NC SPI Data IN SDI 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground