The active temperature sensing component on the Thermo 14 Click Board™ 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 Thermo 14 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 slave 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 Board™s to be used on a system, each with the different I2C address.
The Thermo 14 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.
| Type | Temperature & humidity |
| Applications | can be used for a rapid development and testing of various applications based on wereable devices, smart home automation, smartphones, HVAC, refrigerators, white goods, thermostats… |
| On-board modules | Thermo 14 Click Board™ uses the STTS22H IC, a high accuracy temperature sensor, from STMicroelectronics. |
| Key Features | Low temperature drift, low-power consumption, programmable alert engine, compact sensor size, critical temperature warnings |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click Board™ size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V |
This table shows how the pinout on the Thermo 14 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 | ||
| NC | 2 | RST | INT | 15 | INT | Interrupt | |
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | ADDR SEL | Left | Communication interface selection: left position 0, right position 1 |
We provide a library for the Thermo 14 Click Board™ on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The library covers all the necessary functions that enables the usage of the Thermo 14 Click Board™. It holds functions that allow full control of the device to the user. User can calibrate the device, read temperature or read raw values if necessary.
float thermo14_get_temperature ( ); - Function is used to get the temperature.float thermo14_raw_to_celsius ( int16_t temp_raw ); - Function is used to perform necessary calculacion in order to get temperature freom raw data.int16_t thermo14_temp_raw_get ( ); - Function is used to get the raw value.The application is composed of three sections :
void application_task ( )
{
temp_val = thermo14_get_temperature( );
mikroBUS_logWrite( " Temperature: ", _LOG_TEXT );
log_display( temp_val );
mikroBUS_logWrite( deg_cel, _LOG_LINE );
mikroBUS_logWrite( "----------------------", _LOG_LINE );
Delay_ms( 3000 );
}
Additional Functions :
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
Depending on the development board you are using, you may need a USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
The Thermo 14 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click Board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
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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."}]},{"type":"paragraph","children":[{"type":"text","value":""}]},{"type":"paragraph","children":[{"type":"text","value":" "}]},{"type":"paragraph","children":[{"type":"text","value":"The "},{"type":"text","value":"Thermo 14 Click Board™","bold":true},{"type":"text","value":" 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."}]},{"type":"paragraph","children":[{"type":"text","value":"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 slave address."}]},{"type":"paragraph","children":[{"type":"text","value":"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 Board™s to be used on a system, each with the different I2C address."}]},{"type":"paragraph","children":[{"type":"text","value":"The "},{"type":"text","value":"Thermo 14 Click Board™","bold":true},{"type":"text","value":" 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."}]},{"type":"heading","level":3,"children":[{"type":"text","value":"SPECIFICATIONS"}]},{"type":"paragraph","children":[{"type":"text","value":"Type\nTemperature & humidity\nApplications\ncan be used for a rapid development and testing of various applications based on wereable devices, smart home automation, smartphones, HVAC, refrigerators, white goods, thermostats…\nOn-board modules\nThermo 14 Click Board™ uses the STTS22H IC, a high accuracy temperature sensor, from STMicroelectronics.\nKey Features\nLow temperature drift, low-power consumption, programmable alert engine, compact sensor size, critical temperature warnings\nInterface\nI2C\nCompatibility\nmikroBUS\nClick Board™ size\nS (28.6 x 25.4 mm)\nInput Voltage\n3.3V"}]},{"type":"paragraph","children":[{"type":"text","value":" "}]},{"type":"heading","level":3,"children":[{"type":"text","value":"PINOUT DIAGRAM"}]},{"type":"paragraph","children":[{"type":"text","value":"This table shows how the pinout on the "},{"type":"text","value":"Thermo 14 Click Board™","bold":true},{"type":"text","value":" corresponds to the pinout on the mikroBUS socket (the latter shown in the two middle columns)."}]},{"type":"paragraph","children":[{"type":"text","value":"Notes\nPin\nPin\nNotes\nNC\n1\nAN\nPWM\n16\nNC\nNC\n2\nRST\nINT\n15\nINT\nInterrupt\nNC\n3\nCS\nRX\n14\nNC\nNC\n4\nSCK\nTX\n13\nNC\nNC\n5\nMISO\nSCL\n12\nSCL\nI2C Clock\nNC\n6\nMOSI\nSDA\n11\nSDA\nI2C Data\nPower Supply\n3.3V\n7\n3.3V\n5V\n10\nNC\nGround\nGND\n8\nGND\nGND\n9\nGND\nGround"}]},{"type":"heading","level":3,"children":[{"type":"text","value":""},{"type":"text","value":"ONBOARD SETTINGS AND INDICATORS"}]},{"type":"paragraph","children":[{"type":"text","value":"Label\nName\nDefault\n Description\nLD1\nPWR\n-\nPower LED Indicator\nJP1\nADDR SEL\nLeft\nCommunication interface selection: left position 0, right position 1"}]},{"type":"heading","level":3,"children":[{"type":"text","value":" "}]}]} - summary:The Thermo 14 Click Board™ 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. The Thermo 14 Click Board™ provides an accuracy of ±0.5°C in the range from -10°C to 60°C.
The sensor used on the Thermo 14 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.