IR Receiver for the I2C Bus

A commonly encountered problem is that the code sent by an infrared transmitter cannot be evaluated by a microcontroller directly on being received, due to the fact that the microcontroller is busy with something else at the time or is simply too slow to sample the signal at a rate sufficient to achieve an error-tolerant evaluation. In such cases, a helpful solution is to use a Philips SAA3049 infrared television decoder, which is still available as an NOS (new old stock) item although it is no longer being manufactured.

In the upper right hand part of the circuit diagram, the names of the I2C bus lines have been transposed and should be corrected as follows:SDA on pin 15 of IC1SCL on pin 14 of IC1INT on pin 19 of IC2It should be noted that the SAA3049 is no longer produced by Philips Components.