We use TI's TLC5615, 10-BIT DIGITAL-TO-ANALOG CONVERTERS as our DAC.
This chip has 3-Wire Serial Interface, so we can use Arduino to control it.
Arduino is an open-source physical computing platform based on the AVR MCU.
Now give the Arduino program.
//Arduino project http://arduino.cc //by Mini Dragon at http://minidr.com/archives/687 //This program is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. #define CS 2 //chip enable #define CLOCK 3 #define DATA 4 #define HALF_CLOCK_PERIOD 2 //2 uS of clock period float j=0; void setup() { pinMode(DATA, OUTPUT); pinMode(CLOCK,OUTPUT); pinMode(CS,OUTPUT); digitalWrite(CS,HIGH); digitalWrite(DATA,LOW); digitalWrite(CLOCK,LOW); } void writeValue(uint16_t value) { digitalWrite(CS,LOW);//start of 12 bit data sequence digitalWrite(CLOCK,LOW); for(int i=9;i>=0;i--)//send the 10 bit sample data { digitalWrite(DATA,((value&(1< <i)))>>i);//DATA ready delayMicroseconds(HALF_CLOCK_PERIOD); digitalWrite(CLOCK,HIGH);//DAC get DATA at positive edge delayMicroseconds(HALF_CLOCK_PERIOD); digitalWrite(CLOCK,LOW); } digitalWrite(DATA,LOW);//A 10-bit data word with two bits below the LSB bit (sub-LSB) with 0 values must be written since the DAC input latch is 12 bits wide.(SEE TLC5615C DATASHEET) delayMicroseconds(HALF_CLOCK_PERIOD); digitalWrite(CLOCK,HIGH);//DAC get 1 bit useless data at positive edge delayMicroseconds(HALF_CLOCK_PERIOD); digitalWrite(CLOCK,LOW); delayMicroseconds(HALF_CLOCK_PERIOD); digitalWrite(CLOCK,HIGH);//DAC get 1 bit useless data at positive edge delayMicroseconds(HALF_CLOCK_PERIOD); digitalWrite(CLOCK,LOW); digitalWrite(CS,HIGH);//end 12 bit data sequence } void loop() { j=567;//DAC OUT=j*Vref/1024 writeValue(floor(j)); }
Each DAC output voltage maps a main Vout.
To be continued.
Comments