TS3A227E: Schematic check

Lumina Gui

Genius 3690 points

Part Number: TS3A227E

Hi TI Teams,

Can u help to check the schematic of TS3A227E and give us some suggestion? The schematic is as below.

TS3A227E_Schematic.pdf

Also we still have some question for the using of TS3A227E, see as below:

1) The TS3A227E put on the right motherboard, and Audio Jack on the left board, connected by the middle of the line. From the datasheet we can learned that this design does not meet the requirements of layout , so is it necessary to put TS3A227E near Audio Jack.

2) Is it feasible that TS3A227E does not connect the I2C?

3) If the TS3A227E is connected to I2C, is there any driver for it? What functions does the driver, and is there any difference with no drive?

4) Is there an Auto Switch with Codec design? And how to use MIC-PRES? The Audio codec is Realtek ALC5640 and CPU platform is ROCKCHIP, runing system is Android 12. Does the TS3A227E and ALC5640 cooperate at the software level (firmware communication) or at the hardware level (GPIO connection)?

Thanks,

Kind Regards

over 2 years ago

0 Stephen Scheramic over 2 years ago

TI__Intellectual 1166 points

You are correct we recommend that the placement of the TS3A227E be as close as possible to the audio jack as possible. This is to reduce the parasitics from the trace such as the added resistance to the audio path. Section 12 of the datasheet has more details

The I2C communication should be ok across the cable, but you will have to make sure that your I2C output from your microcontroller can handle the capacitance on the traces and cable.

The I2C on the TS3A227E in only an input for configuring the debounce and switch state. It does not drive any output on the SDA or SCL. But the I2C does not need to be used, if you do not use it connect to Vdd, which is what it looks like you are doing on your schematic. In that case you can use DET_TRIGGER. See sections 9.1 and 7.7.

The TS3A227E doesn’t have any built-in firmware. To communicate with the device I2C is the only thing that is needed, as high lighted in sections 9.5 and 9.4.

The MIC_PRESENT is an output of the TS3A227E which tells the microcontroller/Codec that there was an insertion of an audio jack where the microphone is present like in a 4 pole audio jack. Section 9.3 has details on the 3 and 4 pole audio jacks.

Other than that, I don’t see anything concerning on the schematic.

We also have some FAQs on common audio switch questions which may help if you have any other concerns.

https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1083778/faq-audio-switches---frequently-asked-questions

Thanks,

Stephen

0 Lumina Gui over 2 years ago in reply to Stephen Scheramic

Genius 3690 points

Hi Stephen,

Due to the below requirements of the layout of TS3A227E, we put TS3A227E near to the small board earphone. Please help to check if there is any problem.