PCM1754-Q1: #12 test pin

Shinji Tsuji

Genius 12668 points

Part Number: PCM1754-Q1

Hi team,

Could you explain the function of #12 test pin?

If I leave it Open or connect to GND, what does the device behave?

I concern if this is a test mode pin and accidentally fall into test mode.

regards,

over 3 years ago

0 Paul_Frost over 3 years ago

TI__Guru 53183 points

Hi Tsuji-san,

This pin should be connected to ground or left floating (the devices as an internal pulldown on this pin). Only by connecting this pin to a higher voltage (like VCC) is is possible to cause unexpected behavior.

Thanks,

Paul

0 Shinji Tsuji over 3 years ago in reply to Paul_Frost

TI__Genius 12668 points

Hi Paul,

Is that for debug purpose or internal trimming or initial setting purpose?

regards,

0 Shinji Tsuji over 3 years ago in reply to Shinji Tsuji

TI__Genius 12668 points

Hi Paul,

One more question.

I concern noise coupling into test pin.

How does this device behaves if Test pin is unexpectedly driven High?

Is there a way to recover from test mode?

regards,

0 Paul_Frost over 3 years ago in reply to Shinji Tsuji

TI__Guru 53183 points

Hi Tsuji-san,

I do not know all of the potential behaviors of setting the pin high, but I recall that if I set it high the output is disabled. If the customer is concerned about noise coupling causing a problem, then I recommend they short the pin directly to ground.

Thanks,

Paul

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PCM1754-Q1: #12 test pin