LMP90100: GPIO pins D0-D6 as digital inputs

Alan Islas

Part Number: LMP90100
Other Parts Discussed in Thread: ADS124S08

Hi,

Are the GPIO pins D0-D6 CMOS inputs?

We would like to know if there could be issues with leaving them floating, when configured as inputs, such as indeterminate states and ESD damage.

Regards,

Alan

over 2 years ago

0 Bryan Lizon86 over 2 years ago

TI__Guru 53706 points

Hi Alan Islas,

I believe I already answered this question as it was asked by your colleague Noah: https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/1248378/lmp90100-channel-scan-order-doesn-t-seem-to-follow-first_ch-to-last_ch

The LMP90100 does not have internal pull-up / pull-down resistors on the GPIO pins. You should also not let these pins float. Tie each pin to some voltage level (either GND or VIO). You can also set the GPIOs as digital outputs, where they are allowed to float

Though it sounds like you may be far along in your design, I should also recommend our newer ADC in this device family, the ADS124S08. This is effectively a better device in all aspects (features, performance, power, size) compared to LMP90100. If not for this current project, I would consider this newer ADC for future designs

-Bryan

0 Alan Islas over 2 years ago in reply to Bryan Lizon86

Prodigy 60 points

Hi Bryan, thank you very much for your answer. It was very helpful.
Will keep in mind your recommendation of the newer ADC for our next design.

-Alan

0 Bryan Lizon86 over 2 years ago in reply to Alan Islas

TI__Guru 53706 points

Hi Alan Islas,

I am glad we could help!

-Bryan

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LMP90100: GPIO pins D0-D6 as digital inputs