LMP90080-Q1: Unused pin for ADC LMP90080QMH/NOPB

Sharan Ghimire

Part Number: LMP90080-Q1

Hello,

The data sheet doesn't specifically mentions what to do with the unused pins. Can I leave them floating? Unused pins for my design would be 12-15 and 21-27. Or they need to be pulled up using some resistors?

Thanks

over 3 years ago

0 Bryan Lizon86 over 3 years ago

TI__Mastermind 41781 points

Hi Sharan,

Indeed I could not find this information in the datasheet. I will dig into this deeper and get back to you in the next 1-2 days.

-Bryan

0 Bryan Lizon86 over 3 years ago in reply to Bryan Lizon86

TI__Mastermind 41781 points

Hi Sharan,

For the GPIOs, the pins don’t have any built-in pull-ups or pull-downs and the device comes up default with the GPIOs as inputs. For those reasons, we recommend that the inputs be tied down and not floating.

For the XIN/XOUT pins, the original user’s guide didn’t help based on how the schematic was put together, but we did find this post:

https://e2e.ti.com/support/data-converters/f/73/t/236095?LMP90100-Schematic-Design

Basically this says that if you plan to use the internal clock (CLK_SEL = 0) you can leave Xin and Xout open.

-Bryan

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LMP90080-Q1: Unused pin for ADC LMP90080QMH/NOPB