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Original question:

AMC1204: AMC1204 TIC solution

CCS/AMC1204: AMC1204 - MSP430 - Linky Meters TIC Protocol

ifrht (Ferhat)
Prodigy 20 points
Part Number: AMC1204
Other Parts Discussed in Thread: MSP430F67751A,

Tool/software: Code Composer Studio

Hi,

I am trying to read data with TIC protocol that will use AMC1204. I use IC MSP430F67751A.
In the slaa619a sample project, SMCLK is used as the clock signal. I also use SMCLK, but the SMCLK signal from my IC is as follows: Is signal shape normal?

In addition, the signal output from AMC1204 is as follows. In this signal, we can see 0 and 1 separately. But my problem is how long the signal in the incoming signal carries logical information. So what is the period of each logical data?

Linky MID meter output: (Time scales are not synchronized)

  • 0
    TI__Guru**** 180931 points

    Hi there!

    Welcome to our e2e Forum!

    This is actually an MSP430 question, but let's get some more information on how you are implementing the signals to the AMC1204.  For your SMCLK - the sinusoidal nature of the first capture above could be due to the 20MHz BW limit you have on your input CH1 - even so, the signal should work for the AMC1204 modulator. 

    If you go through the original post, the authors of the SLAA216 document implemented a 50Hz signal using a signal generator and they were essentially saturating the AMC1204 input high or low to get a majority 'ones' or majority 'zeros' on the output.  How are you applying your input signal to the AMC1204?  From the second capture above, it does not look like you are putting the AMC1204 into a saturated state.

  • 0 in reply to Tom Hendrick
    Prodigy 20 points

    Hi Tom,

    Thank you for your replying.

    I use output of Linky MID meter as a input for AMC1204. This is a data stream.

  • 0 in reply to ifrht (Ferhat)
    TI__Guru**** 180931 points

    OK - I see.  Is it possible to provide a scope shot with the input and output signals synchronized, and perhaps zoomed in a bit?  The signal in this scope shot looks to be +/-5V while the MAX input to the AMC1204 is only +/-250mV so you'll need to scale it down.