This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: TSC2046
Would it be possible to add a minor external load on the internal (buffered) reference?
I would like to add a external 10k or 100k NTC temperature sensor on the aux input via 10k or 100k to Vref.
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.
In reply to José Luis:
Thanks for your reply.
I would like the temperature measurement to be ratiometric. Since the TSC2046 uses single ended conversions on the aux input with Vref as referene to the ADC I thought connecting the NTC as shown below:
I can't find if external loading of Vref is allowed in the datasheet.
In reply to kvdv:
Happy new year!
I think the auxiliary, internal temperature and battery input channels can only be measured using single ended conversions.It appears that Vref is always used as the reference for the ADC when singled ended conversions are done. If Vcc could be selected as the reference for single-ended conversion I could simply connect the NTC circuit to Vcc. Since this seems impossible I would like to connect the NTC to Vref so it's ratiometric.
For the "normal" touchscreen channels I use the differential mode with Vcc as reference.
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. 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 respect to these materials. 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.