EL0402 MÓDULO RADIO FM STEREO TEA5767

Características:

.- Banda de Recepción: 87.5 a 108 MHZ
.- Consumo: 13mA
.- Control Automático de Ganancia
.- Salida de Audio Estereo a nivel bajo
.- Tiempo de Respuesta: 100 ms
.- Alimentación 2.5 ~ 3.5V
.- Medidas: 11.2x11mm

TEA5767 single-chip FM stereo radio.

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* High sensitivity due to integrated low-noise RF input amplifier
* FM mixer for conversion to IF of the US/Europe (87.5 MHz to 108 MHz) and Japanese
(76 MHz to 91 MHz) FM band
* RF Automatic Gain Control (AGC) circuit
* LC tuner oscillator operating with low cost fixed chip inductors
* FM IF selectivity performed internally
* No external discriminator needed due to fully integrated FM demodulator
* Crystal reference frequency oscillator; the oscillator operates with a 32.768 kHz clock
   crystal or with a 13 MHz crystal and with an externally applied 6.5 MHz reference
   frequency
* Phase-locked loop (PLL) synthesizer tuning system
* I2C-bus and 3-wire bus, selectable via pin BUSMODE
* 7-bit IF counter output via the bus
* 4-bit level information output via the bus
* Soft mute
* Signal dependent mono to stereo blend [Stereo Noise Cancelling (SNC)]
* Signal dependent High Cut Control (HCC)
* Soft mute, SNC and HCC can be switched off via the bus
* Adjustment-free stereo decoder
* Autonomous search tuning function
* Standby mode
* Two software programmable ports
* Bus enable line to switch the bus input and output lines into 3-state mode

Código de Ejemplo:

/// Arduino FM receiver with TEA5767 
#include <Wire.h>
#include <LiquidCrystal.h>
unsigned char search_mode=0;
int b=0;
int c=0;
#define Button_next 30
#define Button_prev 31
unsigned char frequencyH=0;
unsigned char frequencyL=0;
unsigned int frequencyB;
double frequency=0;
double freq_available=0; 
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); 
void setup() { 
  Wire.begin();
  lcd.begin(16, 2);
  /// buttons 
  pinMode(Button_next, INPUT);
  digitalWrite(Button_next, HIGH); //pull up resistor
  pinMode(Button_prev, INPUT);
  digitalWrite(Button_prev, HIGH); //pull up resistor
  frequency=87.5; //starting frequency
  frequencyB=4*(frequency*1000000+225000)/32768; //calculating PLL word
  frequencyH=frequencyB>>8;
  frequencyL=frequencyB&0XFF;
  delay(100);
  Wire.beginTransmission(0x60); //writing TEA5767
  Wire.send(frequencyH);
  Wire.send(frequencyL);
  Wire.send(0xB0);
  Wire.send(0x10);
  Wire.send(0x00);
  Wire.endTransmission();
  delay(100);
}
void loop()
{
  unsigned char buffer[5];
  lcd.setCursor(0, 0);
  Wire.requestFrom(0x60,5); //reading TEA5767
  if (Wire.available()) 
  {
    for (int i=0; i<5; i++) {
      buffer[i]= Wire.receive();
    }
    freq_available=(((buffer[0]&0x3F)<<8)+buffer[1])*32768/4-225000;
    lcd.print("FM ");
    lcd.print((freq_available/1000000));
    frequencyH=((buffer[0]&0x3F));
    frequencyL=buffer[1];
    if (search_mode) {
      if(buffer[0]&0x80) search_mode=0;
    }
    if (search_mode==1) lcd.print(" SCAN");
    else {
      lcd.print(" ");
    }
    lcd.setCursor(0, 1);
    lcd.print("Level: ");
    lcd.print((buffer[3]>>4));
    lcd.print("/16 ");
    if (buffer[2]&0x80) lcd.print("STEREO ");
    else lcd.print("MONO ");
  }
  ///// buttons read
  //////////// button_next////////// 
  if (!digitalRead(Button_next)&&!b) {
    frequency=(freq_available/1000000)+0.05;
    frequencyB=4*(frequency*1000000+225000)/32768+1;
    frequencyH=frequencyB>>8;
    frequencyL=frequencyB&0XFF;   
    Wire.beginTransmission(0x60); 
    Wire.send(frequencyH);
    Wire.send(frequencyL);
    Wire.send(0xB0);
    Wire.send(0x1F);
    Wire.send(0x00); 
    Wire.endTransmission(); 
    //////////////////////
    b=100;
  };
  if (!digitalRead(Button_next)&&b==1) {
    ///scannnn UP
    search_mode=1;
    Wire.beginTransmission(0x60); 
    Wire.send(frequencyH+0x40);
    Wire.send(frequencyL);
    Wire.send(0xD0);
    Wire.send(0x1F);
    Wire.send(0x00); 
    Wire.endTransmission();
    /////////////////
    b=100;
  };    
  if (!b==0) b--;
  //////////// button_prev////////// 
  if (!digitalRead(Button_prev)&&!c) {
    frequency=(freq_available/1000000)-0.05;
    frequencyB=4*(frequency*1000000+225000)/32768+1;
    frequencyH=frequencyB>>8;
    frequencyL=frequencyB&0XFF;
    Wire.beginTransmission(0x60); 
    Wire.send(frequencyH);
    Wire.send(frequencyL);
    Wire.send(0xB0);
    Wire.send(0x1F);
    Wire.send(0x00); 
    Wire.endTransmission(); 
    c=100;
  };
  if (!digitalRead(Button_prev)&&c==1) {
    ///scannnn DOWN
    search_mode=1;
    Wire.beginTransmission(0x60); 
    Wire.send(frequencyH+0x40);
    Wire.send(frequencyL); 
    Wire.send(0x50);
    Wire.send(0x1F);
    Wire.send(0x00);
    Wire.endTransmission(); 
    c=100;
  };          
  if (!c==0) c--;
  ////////////////////
}