How to Use TEA5767: Examples, Pinouts, and Specs

The TEA5767 is a single-chip electronically tuned FM stereo radio designed for low-voltage applications. Manufactured by Phillips, this component integrates IF selectivity and demodulation, making it a compact and efficient solution for FM radio reception. It is widely used in portable audio devices, mobile phones, and other consumer electronics where space and power efficiency are critical.

• Portable audio devices
• Mobile phones
• MP3 players
• Personal digital assistants (PDAs)
• Car audio systems
• Home audio systems

1. Power Supply: Connect the VCC pin to a 2.5V to 5.5V power supply and the GND pin to ground.
2. I2C Communication: Connect the SDA and SCL pins to the corresponding I2C data and clock lines of your microcontroller.
3. Audio Output: Connect the LOUT and ROUT pins to the left and right audio inputs of your audio amplifier or headphones.
4. Crystal Oscillator: Connect a 32.768 kHz crystal to the XTAL pin for stable frequency generation.
5. Reference Voltage: Connect the VREF pin to a stable reference voltage, typically 1.2V.

• Decoupling Capacitors: Place decoupling capacitors close to the VCC pin to filter out noise.
• I2C Pull-up Resistors: Use pull-up resistors (typically 4.7kΩ) on the SDA and SCL lines to ensure proper I2C communication.
• Antenna: Connect an appropriate antenna to the VCO pin for better reception.
• Ground Plane: Use a solid ground plane in your PCB design to minimize noise and interference.

#include <Wire.h>

#define TEA5767_I2C_ADDRESS 0x60

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Initialize serial communication
  setFrequency(101.1); // Set frequency to 101.1 MHz
}

void loop() {
  // Main loop does nothing
}

void setFrequency(float frequency) {
  uint16_t frequencyB = (4 * (frequency * 1000000 + 225000)) / 32768;
  byte frequencyH = frequencyB >> 8;
  byte frequencyL = frequencyB & 0xFF;

  Wire.beginTransmission(TEA5767_I2C_ADDRESS);
  Wire.write(frequencyH); // Send high byte of frequency
  Wire.write(frequencyL); // Send low byte of frequency
  Wire.write(0xB0); // Set to stereo, mute off
  Wire.write(0x10); // Set to high side LO injection
  Wire.write(0x00); // No software mute, no search mode
  Wire.write(0x00); // No software mute, no search mode
  Wire.endTransmission();
}

1. No Audio Output: Ensure that the audio output pins (LOUT and ROUT) are properly connected to the audio amplifier or headphones.
2. Poor Reception: Check the antenna connection and ensure it is properly connected to the VCO pin. Also, verify that the frequency is set correctly.
3. I2C Communication Failure: Ensure that the SDA and SCL lines have proper pull-up resistors and that the I2C address is correct.

• Check Connections: Verify all connections, especially power supply, ground, and I2C lines.
• Use Decoupling Capacitors: Place decoupling capacitors close to the VCC pin to filter out noise.
• Verify Frequency Setting: Ensure that the frequency is set correctly in the code and that the crystal oscillator is functioning properly.
• Inspect Antenna: Ensure that the antenna is properly connected and positioned for optimal reception.

By following this documentation, users should be able to effectively integrate and utilize the TEA5767 FM stereo radio module in their projects.