Thermo 14 Click uses the STTS22H digital temperature sensor and thermal watchdog, which can measure temperature measurements between -40°C and +125°C so that the temperature measurement data can be processed by the host MCU. Thermo 14 Click provides an accuracy of ±0.5°C in the range from -10°C to 60°C. The sensor used on this Click board™ has a great combination of features that make it a perfect choice for any temperature measurement application: low temperature drift, low power consumption, programmable alert engine, compact sensor size, critical temperature warnings, and more. The sensor itself requires almost no external components, which simplifies the design, reducing the cost and cutting the time to market.
Thermo 14 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
The active temperature sensing component on Thermo 14 Click is the STTS22H, a high accuracy temperature sensor IC with the 2-Wire interface, from STMicroelectronics. The sensor operating mode is user-configurable and allows selecting between different ODRs (down to 1 Hz) or the one-shot mode for battery saving. In one-shot mode, the sensor current consumption falls to 1.75 µA.
The Click board™ itself has a reasonably small number of components because most of the measurement circuitry is already integrated on the STTS22H sensor. The I2C / SMBus 3.0 compatible serial interface lines, along with the INT pin, which also works in the open drain configuration, are pulled up by the onboard resistors. The 2-Wire lines are routed to the respective I2C lines of the mikroBUS™ (SCK and SDA), while the INT pin is routed to the INT pin of the mikroBUS™.
The STTS22H INT pin is asserted (low) whenever the temperature is equal to or exceeds the high limit or is below the low limit. Once asserted, the output will remain asserted until the STTS22H receives an SMBus Alert Response Address (ARA) from the host and acknowledges with its peripheral address.
The I2C address can be selected with the ADDR SEL onboard SMD jumper. The I2C address can be changed by this jumper, allowing for more than one of these Click boards to be used on a system, each with the different I2C address.
This Click board™ is designed to be operated only with 3.3V logic level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with logic levels of 5V.
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