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TMP1075: conversion time at one-shot mode

R.Fukunaga
Expert 2665 points
Part Number: TMP1075


Hi all,

I would like to know conversion time at one-shot mode.

Is it correct that this is the time until conversion and output in one-shot mode?

Is the time specified from when the register is input to when the temperature is converted?

I think it is μs not ms, is it correct?

Best Regards,

Ryusuke

  • +1
    TI__Genius 12985 points

    Ryusuke,

    The spec is correct to be in ms. The ADC conversion time for one-shot mode is duration of the conversion pulse itself, not the complete time from when register is inputed to when the temperature is converted and ready. Below is a picture from that datasheet that should help explain this.

    This picture shows continuous conversions, but the Active Conversion Time is the 7ms max for a one-shot conversion.

    Regards

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Expert 2665 points

    Hi Alex,

    Thank you for your reply.

    My understanding is that it is as follows.

    I would like to know [1)time} from input I2C to the coversion start.

    I think it is μs not ms, is it correct?

    Best Regards.

    Ryusuke

  • 0 in reply to R.Fukunaga
    TI__Genius 12985 points

    Ryusuke,

    For 1), are you asking for the time between when the controller issues a command to when the conversion begins, or when the I2C communication is read by the device, has completed, and then the conversion begins? The same question for 2), do you want the time it takes between when the conversion completes and when the data is loaded into the registers for reading?

    I don't know if I have these times, but they would certainly be on the order of us or ns. The ADC conversion time would dominate this.

    Thanks

    -Alex

  • 0 in reply to Alex Thompson
    Expert 2665 points

    Hi Alex,

    For 1), The time that I would like to know is [when the I2C communication is read by the device, has completed, and then the conversion begins].

    For 2), The time between when the conversion completes and when the device output data.

    I understand that it is us or ns order.

    Ryusuke

  • +1 in reply to R.Fukunaga
    TI__Genius 12985 points

    Ryusuke,

    Thanks for the clarifications. Those times are completely neligable, on the order of nanoseconds, nearly instantaneous. You will never notice it when doing any sort of conversion, and it's within the tolerance of the internal oscillator.

    Thanks

    -Alex