CCS/TMS320F280049: The signal between the 280049 DSP and comparaor is abnormal.

Jianxing Ke

Part Number: TMS320F280049
Other Parts Discussed in Thread: LMV393

Tool/software: Code Composer Studio

We use GPIO18/X2 (pin68) for XBAR4 function. This pin is connect to a comparator's(LMV393) output., which is pull up to +3.3V. The question is: this pin is not a fixed level. The signal on this pin is a wave of 20MHz.

over 7 years ago

0 Veena Kamath over 7 years ago

TI__Mastermind 32655 points

Hi,

The attached image seems to be corrupted. Can you please upload it again?
Are you saying that you do not see the expected sine wave on the comparator output?

Regards,
Veena

0 Jianxing Ke over 7 years ago in reply to Veena Kamath

Prodigy 40 points

0 Frank Ankapong over 6 years ago in reply to Jianxing Ke

TI__Mastermind 28275 points

Hi user,

If you are trying to attach an image, it didn't come through. Also want to point out that GPIO is a digital pin which means it only accepts 1 and 0 or high and low, there is no in between. Your first post sounds like the input is not digital but analog. Can you clarify the type of signal this 20MHz input is?

0 Frank Ankapong over 6 years ago

TI__Mastermind 28275 points

Hi User,

Is your issue resolved?

0 Frank Ankapong over 6 years ago in reply to Jianxing Ke

TI__Mastermind 28275 points

It's been a while since we heard from you so I'm going to assume your issue is resolved and will be closing this thread. If that's not the case, feel free to reply or create a new thread if this one locks out due to inactivity.

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CCS/TMS320F280049: The signal between the 280049 DSP and comparaor is abnormal.