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VREG Click

PID: MIKROE-2443

Weight: 27 g

Status:

VReg click is a digitally controlled DC Voltage regulator in mikroBUS™ form factor. The design is based on the well-known LM317-M circuit, with the addition of a 12-bit DAC, 12-bit ADC, and an Operational Amplifier. Two pairs of screw terminals serve as inputs and outputs.

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QTY		PPU
2	5%	$22.80
5	10%	$21.60
10	15%	$20.40

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The LM317-M 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/0.5A); and 2) maximum wattage arising from current and I/O voltage difference (should not exceed 1W, 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.

Resources

Click board™ Catalog

Click Boards™

Downloads

VREG click example on Libstock

VREG click schematic

LM317M datasheet

Type	Linear
Applications	Regulating linear power supplies for a wide variety of devices
On-board modules	LM317-M, MCP4921 12-bit DAC, MCP3204 12-bit ADC, ZXMP7A17K MOSFET, LMx58 Low-Power, Dual-Operational Amplifier
Key Features	Input Output screw terminals
Interface	SPI
Compatibility	mikroBUS
Click board size	L (57.15 x 25.4 mm)
Input Voltage	3.3V or 5V

Programming

The following code snippet shows how to set and read the voltage from VReg click and show it on the LCD 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].