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TPL5010: Looking for help to decide if this part will work for me

user8561
Prodigy 10 points
Part Number: TPL5010

Hello, I am working on a project that is reliant upon accurate timing and have been looking for a cheaper device that will meet my needs.  The role of the DS3231 is to supply an interrupt signal every 60 seconds by using the alarm feature and from what I can tell, the TPL5010 is a suitable replacement.  My main question is what kind of timing error can be caused by using 1% tolerance resistors?  I have looked at the datasheet and tried to run the provided equations, but I did not get the same answer that the example provided.  I will assume that I am doing the math wrong.  

  • 0
    TI__Expert 4415 points
    Hi,

    In the TPL5010 datasheet, please disregard equation 2 on page 12. There is a math error- you will notice that the value used for C does not match the value given in the table, which is correct. If you evaluate equation 1 with the values from the table, you should arrive at the same resistance value given in the datasheet.

    To evaluate the timing error due to resistor tolerances, simply plug in the max/min resistance values for Rext and solve for the max/min values of T, in seconds.

    I will note this datasheet error so that it can be corrected in a future revision.

    Regards,
    -Tim