FDC2214: FDC2214

Cesar,

Thank you for your inquiry and your interest in TI products.

Could you provide some additional details on what your are seeing and how it agrees/disagrees with your entries in the tool?

Just so you know, we will be out for the Thanksgiving holidays, returning on Monday 11/30.

Hi John,

e.g. I changed in the default values found in FDC_Tools-development5.xlsx, in Current estimation, for FDC2214, in the Current estimation page only 1 channel to 4 channel.

total active time per all channels measurement D30=D9*D29+(D9-1)*D28+D27+D26+D25 = 5.607ms

Conversion readback time (in active mode) D25 = (1+D23+D9*2*D23)/D14), where D9 is "Number of channels of measurement"

Assuming that I enabled 4 channel the formula adds 4 x times the time to read a channel.

Does it mean that I cannot read, e.g. channel 0 results while doing a conversion on channel 1, etc.

Other questions: How to estimate the power consumption when using the internal 43.5 MHz clock?

How to estimate the power consumption as a function of the FCLK in? With all the other setting adjusted accordingly, to get a the same sampling rate, is the power consumption hire for 40MHz (probably) than for 10 MHz?

I have a few more questions, can we move this conversation over phone or email ?

Thanks,

Cezar

Cesar,

Thank you for the additional details.

I will review them and have an update tomorrow.

Cesar,

Working through the details of your questions will most likely take me a few more days.

Apologies for the delay.

I will update the thread by Thursday or Friday.

Thank you for your patience.

Thanks,

My main goal is to get the power consumption as low as possible (it is an wearable device) while getting more than 100 SPS on all 4 channels and at least 14 bit.

Do you know how much power the internal 43.5 oscillator is taken and it will be shut down if an external clock is provided?

Thanks,

Cezar

Cezar,

I am checking on your questions and should have a reply tomorrow.

Hi John,

One more question:

Has TI any plan for a similar, but power, device?

Thanks,

Cezar

Cesar,

What is meant by a "power device"?

Cesar,

We always strive to offer products with the lowest possible power consumption.

For details on our future product offerings please contact your local TI sales rep.

Hi John,

Do you have some answers to my previous question?

Can you share TI FAE in Ontario, Canada dealing with FDC2214 and similar devices?

Cezar

Cezar,

 I am looking for the name of your TI sales rep, which may take a day or two because I haven't looked this up before.

With regards to your other question, we have confidence in our tools, but due to the nature of the applications they support, they sometimes provide a starting point that must be iterated to achieve the final design.

Hi John,

Should I understand that TI has no answers to my questions about FDC2214? My questions were not covered in the datasheet.

Honestly I am surprised for not getting the answers.

Cezar

Cezar,

If there are questions about our published data sheets, app notes, EVM user guides, etc. we can and will help with that.

However, it is difficult for us to provide expert guidance on customized models and tools because they go beyond the info that has been subjected to careful review by experts in design, applications, characterization and test. 

Thank you for your feedback. We will forward it to our teams that define our future roadmaps & products.

Hi John,

One of the previous questions was:

Do you know how much power the internal 43.5 oscillator is taken and if it will be shut down if an external clock is provided?

Do you have an answer to this question? If not, how can I get it?

Cezar

Cezar,

We don't have data on the power dissipation of the internal clock

The easiest way is to see the power difference is compare the measured device current using an external clock and an internal clock.