SAI connection with codec

[S_R]

Hello,

I want to interface two SAI of STM32L4S7VIT6 with two SGTL5000, which are working as transmitter and receiver at any time as used in telephone. Also interface one Si32287 through PCM. In datasheet SAI1_D1,D2, D3 are given but in reference manual it is not given. Also can we connect for one SGTL5000 with SAI1_FS_A, SAI1_MCLK_A,SAI1_SCK_A,SAI1_SD_A and SAI1_SD_B of same SAI1. And for other SGTL5000, can we connect SAI1_FS_B, SAI1_MCLK_B,SAI1_SCK_B of same SAI1 and for data SDI1_D1 and SDI1_D2. What are the functions of the lines SAI1_D1 and SAI1_D2? 

[AScha.3]

Hi,

>with two SGTL5000

So you want 4ch IN and 4ch OUT - what is it for ?  surround telephone ? :)

+

>What are the functions of the lines SAI1_D1 and SAI1_D2? 

The SAI can connect to 4 pdm mics also....so just set it in Cube and you see the D1...lines used.

+

>of same SAI1 and for data SDI1_D1 and SDI1_D2

No.

+

You can connect a SGTL5000 (stereo, IN and OUT) to SAIx , A for out, B for input data; (master+slave)

and the other SAI for the other SGTL5000 , also on its A + B , for in and out.

[S_R]

Thanks for your response.

See the attached is the connection. Is it feasible to connect STM32L4S7VIT6 with two STGL5000 stero codec and one Si32287 ProSLIC- Single chip-Dual FXS solution. We don't want to share any pins. Is it correct? Please suggest for the same.

[AScha.3 · Accepted solution]

>Is it feasible to connect STM32L4S7VIT6 with two STGL5000 stero codec and one Si32287 ProSLIC- Single chip-Dual FXS solution

Now 6 channels ?  No.

With 2 SAI you can connect 2 codecs , not 3.

You need a bigger cpu/soc , with 3 SAI ; or 2 SAI + 2 I2S .

And no answer to: 4ch IN and 4ch OUT - what is it for ?  surround telephone ? :)

[S_R]

Hello, 

 So can you suggest any alternative STM32 IC for the block diagram I have sent to you? See below:

 

[LCE]

> With 2 SAI you can connect 2 codecs , not 3.

Not sure about this.

If this L4 has the typical STM32 SAI that I know, then there are 2 SAIs with 2 blocks each, so you can connect 4 stereo codecs -> 8 channels.

[AScha.3]

No.

Every subblock can handle one rx or tx line.

So one SAI can handle one rx+tx codec, 2 or more channels of course in this stream, if the codec has more than 2 ch . Or two DACs or ADCs , if both subblocks only rx or tx doing.

[S_R]

Subject: Request for Alternate MCU Suggestion for STM32L4S7VIT6

Dear Sir/Madam,

Please help suggest an alternative to the STM32L4S7VIT6.
In our design, we need to interface two stereo codecs and one Si32287 (FXS/FXO) device, and all interfaces are full duplex.

The current MCU (STM32L4S7VIT6) provides only two SAI interfaces, which is insufficient for our requirement.
Kindly recommend a suitable pin-compatible or higher-end STM32 series MCU (or any other compatible alternative) that supports additional SAI/I²S interfaces or equivalent audio peripheral channels for simultaneous full-duplex communication.

Thank you for your support.

[AScha.3]

Hi,

So need 3 SAI ; i have/use H743ZI , has 4 SAI.

Just look in chip selector, set it for SAI ranking...or check I2S , then look at description /ds of this, to decide.

https://www.st.com/content/st_com/en/stm32-mcu-product-selector.html

select SAI here:

[S_R]

Hi AScha.3,

Thank you for your quick response and for the helpful suggestion.
Following your advice, we checked the STM32H7 series and found STM32H742VIT6, multiple SAI interfaces and seems to connect two stereo codecs and one Si32287 (all full duplex).

Could you please confirm if STM32H742VIT6 would be a suitable replacement?

Thanks again for your guidance.