One jack but two operation mode - HELP

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1

Hello !

I'm doing a project with an RN52 audio codec bluetooth module. The goal of the RN52 module is to convert audio data from the jack to the bluetooth module, and vice versa.

The link to the RN52 datasheet : http://ww1.microchip.com/downloads/en/DeviceDoc/rn-52-ds-1.0r.pdf

The link to the circuit diagram : Capture hosted at ImgBB — ImgBB

When the analog output of the RN52 (SPKR_R+, R-, L+, L-) are sending audio data, I don't want it to go the the analog input of the RN52 (MIC_R+, R-, L+, L-), but only to the port jack.

I don't know what's going to happen if at the same time the RN52 send audio data from its analog output pins and receive it from its analog input pins.

What can I do to prevent it from happening ?

2

The schematic is distinctly odd, there are diodes on the outputs of the TPA6112 amplifier chip,
and I can figure out how they allow the signal to be treated as a microphone input if mic bias is
high, but otherwise they appear to distort and rectify the audio output badly...

Perhaps the circuit is wrong.

I suspect its designed to either receive, or transmit. Have you tried it out?