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Any advise in using a digital temp. sensor in a "noisy" environment for 3 meter long stretches?

Epic Steve
Prodigy 80 points
Hello!
Here are my customer's needs:
Require +/- 2 degrees Celcius and currently use NSC LM390 TO220  (analog).
The NSC solution is tolerent to noisy enviroments and performs adequately over 3 meter runs.  They have found that I2C is succeptable to noise.
Any advise?
Thanks!
Steve
  • 0
    Expert 1495 points

    I would use a microcontroller to read / write the i2c data, and convert to RS232 / RS422 / RS485 / Ethernet / Wireless etc etc etc...

  • 0 in reply to Jayant Deshpande
    TI__Mastermind 27715 points

    Hello Steve,

    The effects of noise and stray capacitance can be reduced by using shielded cables with the shields connected to GND, but as a rule we don't recommend running I2C signals over lengths greater than 1m. I agree with Jayant's suggestion to read the I2C data with a micro and convert to a more robust protocol that's intended for greater transmission distances.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    High Performance Linear