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LM57-Q1: Without RSENSE1 & RSENSE2 resistor, Can we take analog (Vtemp) output. what will the default gain?

RAHUL RAI
Prodigy 55 points
Part Number: LM57-Q1

Hi All, 

For this part LM57TSPWQ1,

Without RSENSE1 &  RSENSE2 resistor, Can we take  analog (Vtemp) output. what will the default gain?

Moreover Please confirm IC still give the Vtemp output or which gain??

  • 0
    TI__Expert 6205 points

    Hi Rahul,

    I will have to test this on bench. Please allow a 3 days for me to collect the data and give you an update, thank you.

    Best regards,

    Simon Rojas

  • 0 in reply to RAHUL RAI
    TI__Expert 6205 points

    Hi Rahul,

    I apologize for the delay. I ordered the samples and was hoping to get the units last week. Unfortunately, these are being shipped from outside the US and they are stuck in customs so it will take a few days for me to receive them. The only alternative I could offer right now would be to test the units yourself by taking 2 measurements in a temperature controlled environment and check which slope the device defaults to.

    I am still waiting on the units and will test them as soon as I receive them.

    Best regards,

    Simon Rojas

  • +1 in reply to Simon Rojas Avila
    TI__Expert 6205 points

    Hi Rahul,

    I apologize for the delay here. I have been able to test an unit in a temperature-controlled environment setup and can confirm that the device will default to the J2 gain (-5.166mV/C) when the Rsense pins are left open and no resistors are used. The device can still be used to read the analog temperature.

    Setup conditions:

    • Tested at room temp ~ 22C and read 0.975V and at high temperature >150C and read ~ 200mV 
    • Pin 1: tied to low-side of SMU and low-side of DMM
    • Pin 2: OPEN
    • Pin 3: OPEN
    • Pin 4: tied to highside of SMU at 3.3V
    • Pin 5: OPEN
    • Pin 6: OPEN
    • Pin 7: OPEN
    • Pin 8: Tied to high side of DMM

    Thank you again for your patience. Please let me know if you have further questions.

    Best regards,

    Simon Rojas