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TMP468: Accuracy, TYP value definition

David Perez
Prodigy 210 points
Part Number: TMP468

Hi all,

 

Looking at the datasheet accuracy info of TMP468 we are wondering what the definition is used for typical value.

 

Can anybody explain which would be the correct definition for typical?

Which would be the percentage of TMP468 devices that would comply with the typical value accuracy info?- Statistically from 100 sensor how many of those would measure the temperature inside those accuracy typ value?

thanks in advance for your help.

  • 0
    TI__Mastermind 38165 points

    Hi David,

    Generally speaking, a min/max specification is a guarantee that no product leaving the factory will violate that limit. In order to achieve this, we must write a min/max spec that we have never observed on a device. A typical specification does not have the same significance as a min/max. Typical simply describes the average or nominal device in a sample of devices. There is no further statistical significance for a typical specification. 

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Prodigy 210 points

    Thanks for the fast response, Ren.


    The min/max info is understood. Regarding the typ value as far as I understand there is no statistical analysis to obtain that value that can give us an idea of the % of devices that will comply that. It has been calculated with the average of a X produced devices. Am I right?


    One of our customers is interested in using the part and is very interested in the accuracy of its final product so they were wondering if that typ value could be supported by some statistical analysis where the 95% (as an example) of the TMP468 sensor distribution complies the typ value.


    Thanks again.

  • 0 in reply to David Perez
    TI__Mastermind 38165 points

    I can't recommend that any assumptions be made about typical specifications, because min/max is the spec that we stand by. 

    I would recommend that you review Figure 2 through 4 in the datasheet, as this gives the most insight into device behavior.

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Prodigy 210 points

    Undertood, I will have a look in depth to indicated figures.

    On the other hand, would it be possible to obtain a certificate from Texas guaranteeing that none of the TMP468 chips sold exceed the MAX/MIN accuracy indicated for the chip's factory-calibrated internal sensor? 

    Thanks!

  • 0 in reply to David Perez
    TI__Guru* 91146 points

    David - 

    TI Datasheet(s) is/are the guarantee to the customer of device performance. In this case specifically, Section 6 of that datasheet contains the EC table with mins and maxs which are guaranteed.

    In the event any device does not meet these specs, and all other aspects of the design appear to be correct (schematic, layout, firmware) - we have this forum and a quality process which is dedicated to resolving to root cause, per device, as required.     

    See Sections 19-20 of our Quality Manual: https://www.ti.com/lit/ml/szzq076o/szzq076o.pdf