• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 167 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMCS1100: Distance from external magnetic field

Hidekazu Someno
Expert 5130 points
Part Number: TMCS1100

Hi, Team,

A relay is installed near the TMCS110 in the application.
Since the relay may have a magnetic field, there is concern which can affect the current sensor.

How far is it recommended to keep the two apart?
If you have any reference materials, please show them.

Regards,
H. Someno

  • 0
    TI__Mastermind 27930 points

    Hello H. Someno,

    This is not a clear answer as the relays will all be different.  For example some have higher voltage ratings and will have lower currents to drive the coil but this could mean there more turns on the coil.  Or if they are latching relays the coil will only be energized during the transitions.   The other thing to consider is orientation.  The orientation of the coil vs the sensing element in the TMCS1100 matters as well.  This is because the TMCS1100 measure the vertical axis of the package generated by the current so only external field it that axis will impact the sensor element. 

    I would recommend looking at the EVM or TMCS1100 device along with the relay being used in that particular application and applying any external signal required and see the TMSC1100 response.  It would look like an offset error.  So this can be done with zero current at the TMCS1100.