How does it work?

The sensor IC used on the Temp-Log 5 click is CAT34TS02 from ON semiconductor that combines a JC42.4 compliant Temperature Sensor (TS) with 2 Kb of Serial Presence Detect (SPD) EEPROM. Temperature sensor measures and stores temperatures at least 10 times in second, allowing it to be retrieved by the host MCU via the I2C interface. The result can be compared to critical limits, stored into internal registers. This allows the sensor to reduce the processing workload of the host MCU by employing the trigger limits mechanism: by asserting the EVENT line to a LOW logic level, the CAT34TS02 is able to wake up the host MCU, reducing the power consumption. The EVENT pin is routed to the INT pin of the mikroBUS™. The CAT34TS02 IC can be configured to trigger an EVENT in three different modes: Interrupt mode, Comparator mode, and Critical Temperature mode.

When set in the Interrupt Mode, the EVENT output will be asserted every time the temperature crosses one of the alarm limits. Once the temperature exceeds the critical limit, the EVENT remains asserted as long as the temperature stays above the critical limit. The EVENT can be cleared by setting a bit in a corresponding register (must be cleared by the software). However the pin will remain asserted as long as the temperature exceeds the critical limits.

In the Comparator mode, the EVENT pin is asserted whenever the temperature is outside the predefined limit values, and deasserted as soon as the temperature drops under the limit (no need to clear the bit by the software). If set in the Critical Temperature Mode, the EVENT pin will be asserted only if the temperature exceeds a critical threshold limit. The limit values can be programmed via the corresponding registers.

CAT34TS02 IC uses the I2C/SMBus protocols to communicate with the host MCU. Its I2C bus pins are routed to the mikroBUS™ I2C pins and are pulled to a HIGH logic level by the onboard resistors. The I2C slave address of the CAT34TS02 IC can be selected by ADDR pins A0, A1 and A2: LOW logic level clears the corresponding address bit (GND), while HIGH logic level sets the bit (VCC). This can be done using a group of onboard jumpers, positioned under the label ADDR SEL.

The provided click board™ library contains simple and easy to use functions, which simplify configuring and reading of the measurement data. These functions are demonstrated in the included example application and can be used as a reference for custom projects. These functions can be used in mikroC, mikroBasic and mikroPascal compilers for all MCU architectures, supported by MikroElektronika.

Specifications

Pinout diagram

This table shows how the pinout on Temp-Log 5 click 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 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

Temp-Log 5 click electrical specifications

Onboard settings and indicators

Software support

We provide a library for the Temp-Log 5 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

The library initializes and defines the I2C bus driver and drivers that offer a choice for writing data in TS register and read data form TS register. The library contains function for reading Temperature data, functions for writing and reading EEPROM, functions for reading Interrupt status and temperature status. The library provides full control of all the registers that the modules contain.

Key functions:

• float templog5_getTemperature() - Temperature Data
• void templog5_writeEEPROM(uint8_t start_addr, uint8_t *dataIn, uint8_t nByte) - Write EEPROM
• void templog5_readEEPROM(uint8_t start_addr, uint8_t *dataOut, uint8_t nByte) - Read EEPROM

Examples description

The application is composed of the three sections :

• System Initialization - Initialization I2C module and set INT pin as INPUT.
• Application Initialization - Initializes driver init, Test comunication, EEPROM write/read test and configuration device for measurement.
• Application Task - Reads Temperature data and logs data to the USBUART every 1 sec.

void applicationTask()
{
    float Temperature;

    Temperature = templog5_getTemperature();
    FloatToStr(Temperature, demoText);
    mikrobus_logWrite("--- Temperature: ", _LOG_TEXT);
    mikrobus_logWrite(demoText, _LOG_LINE);
    
    mikrobus_logWrite("------------------------", _LOG_LINE);
    Delay_1sec();
}

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
• Conversions

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.