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F28M35H52C: What to do with unused analog inputs?

raj kumar53
Prodigy 30 points

Part Number: F28M35H52C

Hi,

I am working on an application using F28M35H52C1RFPT DSP.  Concerto Shared Peripherals are accessible from both the Master Subsystem and the Control Subsystem. The

Analog Shared Peripherals include two 12-bit ADCs (Analog-to-Digital Converters).Each ADC having 8 channel. I have used 4 channel ADC from the DSP other ADC channels are unused.

What to do the unused analog inputs? Shall I leave floating or need to provide PU or PD resistor ?

Please guide me.

Regards,

Rajkumar

SANMINA

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I am working on an application using ATmega328p atmel microcontroller. I started with the 28 PDIP version, but now I want to use the 32 TQFP, which I noticed has 2 extra inputs after compiling my Altium project.

These inputs are ADC7:6 which "serve as analog inputs to the A/D converter. These pins are powered from the analog supply and serve as 10-bit ADC channels," according to the datasheet.

I have read online that some people have got unknown results when they use the ADC and have floating inputs. What I read they've done is activate pull-down resistors, but I do not see how to configure them (since they do not belong to an I/O port). Also, my application does not even use the A/D converter at all.

What are the best practices? Should I connect an external pull-down resistor? Ignore Altium error?