Thermo 17 Click

How does it work?

Thermo 17 click is a Click board™ equipped with the TMP451-Q1 sensor IC, 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 remote temperature sensors are typically low-cost discrete NPN or PNP transistors, or substrate thermal transistors or diodes that are integral parts of microprocessors, microcontrollers, or FPGAs.

The temperature is represented as a 12-bit digital code for both the local and the remote sensors, giving a resolution of 0.0625°C. The temperature accuracy is ±1°C (maximum) in the typical operating range for the local and the remote temperature sensors. The two-wire serial interface accepts the SMBus communication protocol. Advanced features such as series resistance cancellation, programmable nonideality factor (ηfactor), programmable offset, programmable temperature limits, and a programmable digital filter are combined to provide a robust thermal monitoring solution with improved accuracy and noise immunity. The TMP451-Q1 device is ideal for multi-location, high-accuracy temperature measurements in a variety of automotive sub-systems. The device is specified for operation over a supply voltage range of 1.7 V to 3.6 V and a temperature range of –40°C to 125°C.

Because of its main features, this Click is perfect for automotive infotainment systems, ECU processor temperature monitoring, TCM processor temperature monitoring, BCM processor temperature monitoring and LED headlight thermal control.

The TMP451-Q1 device operates only as a slave device on either the two-wire bus or the SMBus. Connections to either bus are made using the open-drain I/O lines, SDA and SCL. The SDA and SCL pins feature integrated spike suppression filters and Schmitt triggers to minimize the effects of input spikes and bus noise.

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.

Specifications

Pinout diagram

This table shows how the pinout on Thermo 17 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Termal shutdown	AN	1	AN	PWM	16	NC
	NC	2	RST	INT	15	INT	Interrupt output
	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

Onboard settings and indicators

Software Support

We provide a library for the Thermo 17 Click 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.

Library Description

Library probides functions for reading from and writing to device, and additional function for reading temperature value from sensor.

Key functions:

• void thermo17_generic_write ( uint8_t reg_adr, uint8_t write_data ) – Function for writing data
• uint8_t thermo17_generic_read ( uint8_t reg_adr ) – Function for reading data
• float thermo17_read_temp ( uint8_t temp_macro ) – Function for reading temperature from device

Examples description

The application is composed of three sections :

• System Initialization – Initialization of I2C module and setting int and an pin to input
• Application Initialization – Check id status
• Application Task – Appliction measures temp value every 1000ms and logs it

void application_task ( )
{
    float read_data;
    char txt_out[ 30 ];

    read_data = thermo17_read_temp( THERMO17_TEMPERATURE_LOCAL );
    FloatToStr( read_data, txt_out );
    mikrobus_logWrite( " - LOCAL: ", _LOG_TEXT );
    mikrobus_logWrite( txt_out, _LOG_LINE );

    Delay_ms( 100 );

    read_data = thermo17_read_temp( THERMO17_TEMPERATURE_REMOTE );
    FloatToStr( read_data, txt_out );
    mikrobus_logWrite( " - REMOTE: ", _LOG_TEXT );
    mikrobus_logWrite( txt_out, _LOG_LINE );
    
    Delay_ms( 100 );
    mikrobus_logWrite( " ******************** ", _LOG_LINE );
    Delay_ms( 1000 );
}

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

• I2C
• UART
• Convesions

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

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.