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LM97600 using the temperature diode

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: LM95213, LM84, LM95233
Hello,
 
LM97600 has t-diode function.
But there are few information only of the t-diode.
 
(1)
Are there any application note or technical document for t-diode ?
 
(2)
If we will use t-diode, must we use remote temperature sensor like LM84 or LM95213 etc.?
 
Best Regards,
Ryuji Asaka 
 
 
  • 0
    TI__Mastermind 44560 points

    Hi Ryuji

    There aren't any application notes related to the thermal diode in the LM97600.

    We highly recommend using a remote diode temperature sensor IC like the LM95213. This type of device uses readings at 2 different current levels to provide a relatively accurate measure of the die tempeature.

    Other methods will work, but will usually require the user to perform calibrations to get an accurate measurement.

    I hope this is helpful.

    Best regards,

    Jim B

  • 0 in reply to Jim Brinkhurst1
    Guru 20090 points
    Hello Jim san,
     
    Thank you for the information.
    We can see the "TEMPERATURE DIODE CHARACTERISTICS" in the datasheet page11.
    I can't understand the measurement circuit of this characteristics.
     
    Could I have the measurement circuit for diode characteristics ?
     
    Best Regards,
    Ryuji Asaka
  • 0 in reply to Ryuji
    TI__Mastermind 44560 points

    Hi Asaka-san

    For reference, here is the information listed in the datasheet:

    The measurement is done by applying a DC current through the thermal diode. Two different currents are applied (12uA and 192uA). The voltage at each current is measured, and the difference between the voltages is determined. This measurement is done at junction temperatures of 25 degrees C and 85 degrees C.

    I hope this is helpful.

    Best regards,

    Jim B

     

  • 0 in reply to Jim Brinkhurst1
    Guru 20090 points

    Hello Jim san,

    How 192uA and 12uA are applied to t-diode? Using remote temp sensor ?

    Why 192uA ? and 12uA ?
    I can't find remote temp sensor which has  192uA ,12uA current source.
     
    Best Regards,
    Ryuji Asaka
  • 0 in reply to Ryuji
    TI__Mastermind 44560 points

    Hi Asaka-san

    The dual current method is similar to that used inside the remote diode temperature sensing ICs like the LM95233 and similar devices. Even though the current magnitudes may be different this type of sensor IC will provide a relatively accurate measurement of the LM97600 junction temperature.

    I hope this is helpful.

    Best regards,

    Jim B

  • 0 in reply to Jim Brinkhurst1
    Guru 20090 points
    Hello Jim san,
     
    Thank you for the reply.
    I understood.
     
    Best Regards,
    Ryuji Asaka