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suggestion for generation of 4 to 20ma output current

praveen2 raju
Prodigy 20 points
Other Parts Discussed in Thread: LM35, TMP112

 i want to design RH+temperature transmitter with current output for that which peripheral is better   "Digital to analog converter " or any current trnsformer or current transducer please any one help me.

thanks&regards

praveen 

  • 0
    TI__Guru* 92715 points
    Praveen,


    Are you looking for something that will convert temperature to current? You could use something that is completely analog (like using LM35) and then use some sort of voltage to current converter to get the current you need.

    Or you could use something like the TMP112, get the digital output, then use some sort of DAC, and then use a voltage to current converter. In this case, you'd need some sort of microcontroller to help get data and set the DAC to the next value.

    A lot of this depends on what accuracy you need, the speed of your measurement, what temperature range you want to measure, if you need to convert back into digital domain, and a lot of other factors. If you need help, post back with some more details about what you want out of your system and I'll help route your questions to people that can give you an answer. Be as specific and detailed as you can about what you need.


    Joseph Wu
  • 0 in reply to Joseph Wu
    Prodigy 20 points
    Joseph Wu


    Am using "Humidity+temperature(SHT15)" sensor it will provide digital output only .and i want to convert this digital output as in the in form of 4ma-20ma current output for this scenario is there any current regulator or DAC only option please help me.


    thanks&regards

    praveen
  • 0 in reply to praveen2 raju
    TI__Guru* 92715 points
    Praveen,


    Ok. In that case, I'll let the DAC applications engineers handle this one then. If the solution could have been done in the analog domain alone, I would have routed you to the engineers in the Sensing group.


    Joseph Wu
  • 0 in reply to Joseph Wu
    TI__Mastermind 46290 points
    Hello Praveen,

    Is this a 2-wire, 3-wire, or 4-wire sensor transmitter configuration? If this is a 2-wire sensor transmitter (also referred to as "loop powered") we will need to use different structures/devices than the 3-wire and 4-wire configurations.