#310 FM/TEA5767

Control the TEA5767 low-power FM stereo radio chip with an Arduino.

Build

Here’s a quick video demonstration:

Notes

A couple of TEA5767 Low-power FM stereo radio chips landed in my lap. They arrived mounted on a small module board with all the essential supporting circuitry, so they should be ready to run without much external hardware.

This project is a simple test drive under Arduino control.

TEA5767 Key Features

Picking the eyes from the data sheet:

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
I²C -bus and 3-wire bus, selectable via pin BUSMODE
4-bit level information output via the bus
stereo output
audio frequency output voltage 60-90mV
total harmonic distortion 1% max
supply voltage 2.5-5.0V
max total current approx 11mA @ 3V

TEA5767 Module

The TEA5767 chip itself is a 40-pin package. The module I have has the chip mounted on a small PCB with most of the required supporting components. It exposes only 10 pins:

Pin	Name	Description
1	SDA	I²C data
2	SCL	I²C clock
3	BUSMODE	bus mode select input
4	W/R	write/read control input for the 3-wire bus
5	VCC	2.5-5V
6	GND	ground
7	ROUT	right audio out
8	LOUT	left audio out
9	MPXO	FM demodulator MPX signal output
10	ANT	antenna in

TEA5767_module

Test Program

The TEA5767.ino sketch is a quick test and demonstration. It uses the Wire library to send the raw commands to the chip over the I²C bus.

The sketch simply skips through a selection of local FM stations.

The output power of the chip is very low - to low to directly drive headphones for example. I used the LEAP#210 TDA7297Kit to amplify the output and drive stereo speakers.