RM48L540: Unused Analogue PIN

Rohit6230

Part Number: RM48L540

Hi,

Could you suggest what to do with an unused Analog-to-Digital Converter (ADC) pin in RM48 microcontroller hardware design? Is keeping it floating acceptable, or is grounding the best option?

over 1 year ago

+1 jagadish gundavarapu over 1 year ago

TI__Guru 69771 points

Hi Rohit,

If you are not using any conversion for unused analog channels, then you can leave them floating. It would not be any problem.

If you did any conversions on these unused channels then you will get some floating values (random values), if you don't want those floating values then you can connect to some reference voltage like GND or VCC.

Please refer below two threads:

(+) TMS570LS1227: How to configure unused pins - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

(+) RM57L843: ADC - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

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Thanks & regards,
Jagadish.

0 Rohit6230 over 1 year ago in reply to jagadish gundavarapu

Intellectual 745 points

Thanks for detail.

Can you tell me why a 0.02-ohm resistor is connected in series with the VCC, VCCIO, and VCCP pins on the evolution board? Is it necessary, or can we remove it?