THERMO 4 click

LM75A features

The LM75A is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma-delta A-to-D conversion technique. The device is also a thermal detector providing an overtemperature detection output.

The sensor can be configured for different operation conditions. It can be set in normal mode to periodically monitor the ambient temperature, or in shutdown mode to minimize power consumption.

The temperature register always stores an 11-bit 2's complement data giving a temperature resolution of 0.125 °C. This high temperature resolution is particularly useful in applications of measuring precisely the thermal drift or runaway.

Specifications

Pinout diagram

This table shows how the pinout on THERMO 4 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	Overtemp Shutdown output
	NC	3	CS	TX	14	NC
	NC	4	SCK	RX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C-bus serial clock input
	NC	6	MOSI	SDA	11	SDA	I2C-bus serial bidirectional data line
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Jumpers and settings

Programming

Code examples for THERMO 4 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows the main function of the example, which initializes the system, then writes data into the register, then reads that data for confirmation, and then reads the current temperature value, and shows that value in degrees Fahrenheit.

01 void main()
02 {
03 
04    system_init();
05     thermo_init(0x55);
06     Delay_ms (100);
07     i=5;
08 
09 
10    /*sets the temperature limit to specified float value*/
11     thermo_write_temperature (65.5, THERMO_TOS);
12     /*reads stored temperature limit*/
13     thermo_read_temperature_text (uart_text, THERMO_TOS);
14     Delay_ms (100);
15         
16    UART_Write_Text("rn Current temperature limit for output signal: ");
17     UART_Write_Text(uart_text);
18     Delay_ms( 1000 );
19 
20        /*reads current temperature in fahrenheit*/
21     _fh_value = thermo_read_temperature_fh (THERMO_TEMP);
22     FloatToStr (_fh_value , uart_text);
23     uart_text [5] = 0;
24     Delay_ms (100);
25     UART_Write_Text("rn rn Current temperature in Fahrenheit: ");
26     UART_Write_Text(uart_text);
27     Delay_ms( 1000 );

Downloads

 LM75A datasheet

 THERMO 4 click schematic

 LibStock: THERMO 4 click library