VREG click

The LM317 IC is a reliable regulator with typical line regulation of 0.01% and load regulation of 0.1%. It also has internal short-circuit current limiting and thermal overload protection.

The circuit regulates voltage by turning all input/output difference into heat (effectively dissipating all the excess power). If it gets too hot it may damage the board or cause unexpected behaviour.

Because of that, the board’s operating range is defined by two factors. 1) maximum input voltage and current (should not exceed 20V/1A); and 2) maximum wattage arising from current and I/O voltage difference (should not exceed 2W, measured as I x (Input V - Output V).

The board also carries a MOSFET chip to toggle the output on and off.

VReg click communicates with the target board MCU through the SPI interface (CS, SCK, MISO, MOSI). The board can use either a 3.3V or a 5V power supply. 

It is also possible to use the board’s power supply as the Input, by resoldering the onboard INPUT SEL jumper.

Specification

Programming

The following code snippet shows how to send temperature readings from VReg click to a TFT display.

 1 while(1)
2 {
3     if(output < set_value)
4     {
5         value = value + 1;
6         if(value>4095) {value = 4095;}
7     }
8
9     if(output > set_value)
10     {
11         value = value - 1;
12         if(value<1) {value = 2;}
13     }
14
15     DAC_Output(value);
16     output = getADC(1)/1.82;
17     ProcessValue(output,2);   // Writes measured value to Lcd
18     Delay_ms(10);                  // Wait 10ms
19
20 }

Code examples that demonstrate the usage of VReg click with MikroElektronika hardware, written for mikroC for ARM, AVR, dsPIC, FT90x, PIC and PIC32 are available on [Libstock].