Application of digital-to-analog converter DAC0832 (including circuit and source code)

Application of Digital-to-Analog Converter DAC0832

[Experimental requirements]

By using the single-chip microcomputer to control DAC0832 to output a sawtooth wave, the light-emitting diode D12 on the experimental board changes from dark to bright and repeats the cycle.

[Purpose of the experiment]

Learn to use a single-chip microcomputer to control the digital-to-analog conversion chip DAC0832.

The DAC0832 is an 8-bit, all-MOS, medium-speed D/A converter. It utilizes an R-2RT resistor decoding network. The conversion result is a pair of differential current outputs with a conversion time of approximately 1µs. It uses a single power supply (+5V, +15V). The reference voltage is -10V to +10V. Here, we choose +5V as the reference voltage. The DAC0832 has three operating modes: pass-through, single-buffered, and double-buffered. Here, we choose pass-through mode, connecting all XFER, WR2, and CS pins to digital ground. Pin 8 connects to the reference voltage, which is +5V in this case. By controlling the regular changes in the output data at port P0, we can generate waveforms such as triangle waves, sawtooth waves, and trapezoidal waves.

[Hardware Circuit]

[source code]

//TX-1BDA test program, after downloading, you can observe the process of D13 LED changing from dark to bright and then turning off.

#include<reg51.h>

sbit wela=P2^7; //digital tube bit selection

sbit dula=P2^6; //segment selection

sbit dawr=P3^6; //DA write data

sbit csda=P3^2; //DA chip select

unsigned char a,j,k;

void delay(unsigned char i) //delay

{

for(j=i;j>0;j--)

for(k=125;k>0;k--);

}

void main()

{

wela=0;

dula=0;

csda=0;

a=0;

dawr=0;

while(1)

{

P0=a; //Continuously add one to a and send it to DA

delay(50); // Delay about 50ms, add one, and then send DA.

a++; 

}

}

Note: As the digital quantity sent to DA continues to increase, the current converted into analog quantity also continues to increase, so when we observe that the light-emitting diode D12 will change from dark to bright and then go out. . .