How to Use RDA5807M: Examples, Pinouts, and Specs

The RDA5807M is a single-chip broadcast FM radio tuner developed by RDA Microelectronics. It features a fully integrated synthesizer, IF selectivity, and MPX decoder. This component supports worldwide FM band reception and is designed for low power consumption, making it ideal for portable devices such as MP3 players, smartphones, and portable radios.

1. Power Supply: Connect the VDD pin to a 3.3V power supply and the GND pin to ground.
2. Audio Output: Connect the LOUT and ROUT pins to the left and right audio channels of your audio output device.
3. I2C Communication: Connect the SCLK and SDIO pins to the corresponding I2C pins on your microcontroller (e.g., Arduino UNO).
4. GPIO Pins: Use the GPIO pins for additional control or status indication as needed.

• Power Supply: Ensure a stable 3.3V power supply to avoid noise and instability.
• I2C Pull-up Resistors: Use appropriate pull-up resistors (typically 4.7kΩ) on the SCLK and SDIO lines.
• Antenna: Connect an appropriate antenna to improve reception quality.
• Decoupling Capacitors: Place decoupling capacitors close to the power supply pins to filter out noise.

#include <Wire.h>

#define RDA5807M_ADDRESS 0x10

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Initialize serial communication for debugging

  // Initialize RDA5807M
  Wire.beginTransmission(RDA5807M_ADDRESS);
  Wire.write(0x02); // Register address
  Wire.write(0xC0); // Enable the chip and set to seek mode
  Wire.write(0x00); // Clear other settings
  Wire.endTransmission();
}

void loop() {
  // Example: Read status register
  Wire.beginTransmission(RDA5807M_ADDRESS);
  Wire.write(0x0A); // Status register address
  Wire.endTransmission();
  
  Wire.requestFrom(RDA5807M_ADDRESS, 2);
  if (Wire.available() == 2) {
    uint8_t highByte = Wire.read();
    uint8_t lowByte = Wire.read();
    uint16_t status = (highByte << 8) | lowByte;
    Serial.print("Status: ");
    Serial.println(status, HEX);
  }
  
  delay(1000); // Wait for 1 second before next read
}

1. No Audio Output: Ensure the audio output pins (LOUT and ROUT) are correctly connected to the audio device.
2. Poor Reception: Check the antenna connection and ensure it is suitable for the FM band.
3. I2C Communication Failure: Verify the I2C connections and ensure pull-up resistors are in place.

• Check Connections: Double-check all connections, especially power supply and I2C lines.
• Use Decoupling Capacitors: Place decoupling capacitors close to the power supply pins to filter out noise.
• Verify Code: Ensure the code correctly initializes and communicates with the RDA5807M.

Q: Can the RDA5807M be used with a 5V microcontroller? A: The RDA5807M operates at 3.3V. If using a 5V microcontroller, use level shifters for the I2C lines.

Q: How can I improve FM reception? A: Use a suitable antenna and place the device in an area with good signal strength.

Q: What is the typical current consumption of the RDA5807M? A: The typical operating current is around 15mA.

By following this documentation, users can effectively integrate and utilize the RDA5807M FM radio tuner in their projects.