My friends at work ..
Foxes
Month: May 2017
TDA7439 board
TDA9437
My sound controller board is finally finished. It’s based on the TDA9437 chip. The Dip version of this chip is only available in an annoying SDIP-30 package. It will not fit on a standard prototype board.
The board had inputs for 4 stereo sources (8 pins) and a single stereo output. The IC can select between any of the connected audio sources, and an appropriate gain can be set.
This board also allows a microcontroller to control volume, treble, mid-range and bass. Mute and independent speaker control functions are also available, but I dont think I will use them.
Data transmission from the microprocessor to the TDA7439 and vice versa takes place through the 2-wire I2C bus interface. This consists of the data and clock lines, SDA and SCL. Pull-up resistors to the positive supply voltage must be used (there are no internal pull-ups).