Part Number: HDC1080
Can you help me understand what the datasheet says about current consumption.
The first column entry says the RH measurement, bit 12 of 0x02 register has typical 190 uA and then
Average @ 1 measurement/second, RH(11 bit) bit 12 of 0x02 register = 0, 710 nA
What is the difference between these two current specifications? It is quite a bit of a difference - uA vs nA. There is a separate entry for startup current too, so I don't know what the difference between the first two are.
Dear agusta mir -
Yes - I am glad to help you understand the way current consumption is considered. In the section you are referring to, there is a note 6 which refers to the conversion time parameter, which is RHCT, further down in same table. If you take the current consumption and spread it out over the conversion time, you will get the average current consumption. It seems there might be a slight rounding offset in the typical current consumption, but its within 5uA I think, so let's do the math here to get you to the understanding you want.
If we consider the formula: IAVERAGE = ICONVERSION x TCONVERSION, then apply the 11 bit values to solve...
IAVERAGE = ~190uA x 3.85mSec
IAVERAGE = 731.5nA (using typical data sheet values), which is ~21.5nA higher than what we have in DS for typical value. (if we look backwards, the typical DS average value indicates the typical current is about 184.4uA, which is why I think it is a slight rounding error, but close enough i think for this kind of low current measurement.
Hope that helps you out.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.