Other Parts Discussed in Thread: TMP61, TMP63, TMP64
With using the TMP61-Q1, is there any way to improve the resolution especially in low temperature range? Thanks.
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The resolution you are referring to is limited by the 12 bit ADC. In reference to the TMP61, there are two options.
1) Bias the TMP61 with a current source. This will give you more dynamic range as can be seen in the chart below.
2) Leverage oversampling methods in software to increase the ADC bit resolution. With the increased bit resolution the variance in voltage is more detectable. Ever 4x over sample you will get an increase of 2 bits resolution. So for a 4x oversample your ADC resolution is effectively 14 bits. With an 8x oversample the resolution increases to 16 bits. This is described in detail in our thermistor design tool which can be found on the TMP61 product folder.
the TMP6x devices are not resistive. They are active silicon devices and the resolution or step size is linear across the temperature range. IF you want to increase the dynamic range of the device, Jalen has given you one of the two methods - either drive the part with a current source or use an op amp to gain up the response. However - why do you think you need to increase the dynamic range on one end of the temp range? is it because you/or the customer is/are familiar with having to do that with an NTC when it is hot? if so, that is not really necessary with the TMP6x, you can "zoom" in on the signal by oversampling it, as Jalen suggested. Is that an option here?
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