TLV320AIC3204: Unused pin connection

Shoo Saga

Intellectual 1446 points

Part Number: TLV320AIC3204

Hi teams,

My customer has a question about TLV320AIC3204.

If they don't use DIN/MFP1, Can they make DIN/MFP1 floating? or connect to the ground?

Thanks, Shoo

over 1 year ago

0 Daveon Douglas over 1 year ago

TI__Genius 11140 points

Hi ,

We suggest connecting the pin to ground if unused .

Regards,

0 Shoo Saga over 1 year ago in reply to Daveon Douglas

TI__Intellectual 1446 points

Hi Douglas,

Thanks for your prompt reply!

My customer has already left the pin floating...

Might that cause any issue?

Thanks,

Shoo

+1 Daveon Douglas over 1 year ago in reply to Shoo Saga

TI__Genius 11140 points

Correction: Unused Digital inputs need to be connected to GND, and should not be left floating

0 Shoo Saga over 1 year ago in reply to Daveon Douglas

TI__Intellectual 1446 points

[deleted]

0 Shoo Saga over 1 year ago in reply to Shoo Saga

TI__Intellectual 1446 points

Hi Douglas,

Thanks for your prompt reply.

What kind of problems might occur if the digital pin left floating?

and can be digital output floating?

Thanks,

Shoo

+1 Daveon Douglas over 1 year ago in reply to Shoo Saga

TI__Genius 11140 points

Hi ,

This is necessary to prevent an unintended impedance or noise received from the pin.

0 Shoo Saga over 1 year ago in reply to Daveon Douglas

TI__Intellectual 1446 points

HI Douglas-san,

Does 9pin status (SCL/SS) prevent 8 pin (SCLK / MFP3) from those noise?

Thanks,

Shoo

+1 Daveon Douglas over 1 year ago in reply to Shoo Saga

TI__Genius 11140 points

Hi Shoo-san,

No, pin 9 doesn't prevent pin 8 noise. The SCLK is used to synchronize SPI data/timing (SS, MOSI, MISO) and comes from host processor, so SCLK would be a clean signal. Assuming SPI protocol, the Slave-select (SS) pin is only a control line for SPI Bus from host processor.

Status of pin 9, determined by SPI_SELECT, will only configure pin to be slave-select (SS for SPI protocol) or SCL (clock for I2C data). (2.8.2 of APP reference guide)

Shoo Saga said:
can be digital output floating?

Yes, digital outputs can be left floating.

Regards,

Audio

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TLV320AIC3204: Unused pin connection