Temp&Hum 20 Click

How does it work?

Temp&Hum 20 Click as its foundation uses the CC2D23, a highly accurate, fully-calibrated relative humidity and temperature sensor from Amphenol. The humidity can be measured within a range of 0 to 100 %RH, while the temperature sensor is designed for a range of -40 to +125 °C. The typical accuracy for humidity is ±2 %RH in the measuring range of 20 up to 80 %RH at ambient temperature, and ±0.3 °C for its operating temperature range with very low power consumption.

Temp&Hum 20 Click communicates with MCU using the standard I2C 2-Wire interface to read data supporting Standard Mode operation with a clock frequency up to 100kHz, providing factory-calibrated 14-bit data to the host controller. This Click board™ also possesses enabling function managed by SiP32431DN, a high side switch with reverse blocking capability. The Enable pin, labeled as EN and routed to the CS pin of the mikroBUS™ socket, activates the SiP32431DN, allowing and powering the main IC the CC2D23 (used for power ON/OFF purposes), and thus enables optimizes power consumption.

It also comes with alarm features, labeled as ALH and ALL and routed to the AN and PWM pins of the mikroBUS™ socket, for preset control at a minimum and maximum humidity, and additional data-ready signal routed on the INT pin of the mikroBUS™ socket indicating that new data is ready for the host.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

This table shows how the pinout on Temp&Hum 20 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
High Humidity Alarm	ALH	1	AN	PWM	16	ALL	Low Humidity Alarm
	NC	2	RST	INT	15	INT	Interrupt
Enable	EN	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	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Temp&Hum 20 Click electrical specifications

Software Support

We provide a library for the Temp&Hum 20 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Temp&Hum 20 Click driver.

Key functions

• temphum20_write_command This function writes a desired command data to the selected command byte.

• temphum20_get_measurement This function waits for the data to be ready, and then reads the temperature and humidity data and converts them to Celsius and Percents, respectively.

• temphum20_set_operating_mode This function sets the device operating mode.

Example Description

This example demonstrates the use of Temp & Hum 20 Click board™.

 void application_task ( void ) 
 { 
     float humidity, temperature = 0; 

     if ( TEMPHUM20_OK == temphum20_get_measurement ( &temphum20, &temperature, &humidity ) ) 
     { 
         log_printf ( &logger, " Temperature: %.3f Crn", temperature ); 
         log_printf ( &logger, " Humidity: %.3f %%rnn", humidity ); 
     } 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.TempHum20

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.

mikroSDK

This 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.

For more information about mikroSDK, visit the official page.