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TMCS1101: Measurement technical query

Jonathan Navor
Expert 7845 points

Hi Team,

Good day! I am posting this in behalf of the customer. We need some Technical details on sensor part # TMCS1101A4BQDRQ1.

We would like to use it in one of my systems, I just want to make sure that it will work with my application.

  1. I want to measure the current on my transformer Primary. The chip has X2 IN+ and X2 IN- and one output. I only need to use one of each input. right?

 

  1. Do I need to buff the output or i can just connect it directly to my scope Via BNC for measurement reading?

 

 

Best regards, 

Jonathan

  • +1
    TI__Mastermind 18780 points

    Jonathan,

    For their first question, there are some things to take into consideration. Mainly, the magnitude of the current the customer is looking to measure, and the angle of approach of the current into the device. There's a best practices guide the customer can look at here for more information. If the customer is planning to use this device at a higher current level, then they will certainly want to utilize the whole lead frame to evenly distribute the current here. To be honest, this is sort of an odd request. May I ask why the customer wishes to leave two of the pins floating here? 

    As for the second question, the output will not need to be buffered into an oscilloscope. Often, scopes have their own internal buffering to handle their own sampling specifications, so this is not an issue. If the customer were planning to feed into an ADC at high speed on their board, however, a buffer may be necessary for best performance. It really comes down to sampling speed, acquisition time, and allowable bit error. I wrote an app note on this very topic for our classic current monitors you can share with the customer here.