Problem in Excitation Signal production @ BATImpedance Example

[znoorsa]

Hi!
I have designed a Board based on the documentations available at Analog devices website.
I dont use ADICup3029 Board, I am using NUCLEO-F411RE.
I want to use AD5941 to measure Battery Impedance spectrum and conduct an EIS Experiment but after loading Corresponding code example (BAT Impedance) on my board, it doesn't show anything but a single frequency and irrelevant impedance value(0 mohm, my Calibration Resistor is 50 mohm). when I connect my battery to the board and change some configuration lines which have been recommended on the CN0510 Application Note(Figure 12. Firmware Configuration ), nothing happens and just some few lines containing some printfs in the source code appears on the serial monitor but there is no information about the battery impedance.
Further more, I can not see Excitation Signal on CE0 pin and all I can see is only a dc voltage on LPF0 pin. I think the problem is from this point, It is rational not to see impedance while AD5941 doesn't produce any Excitation Signal but my question is whyyyy this happens?
I haven't changed anything in the source code except those mentioned lines at CN0510AN.
actually I am new to the microcontroller coding and this is my first project in this area , if anyone has any clue to help me find out where the problem is it will be heartfully appreciated.

[wanghar]

I encountered exactly same problem when I tried to run the BATImpedance example on a NUCLEO-F411RE board. There is no excitation signal on CE0 pin at all and I hope ADI engineers correct the codes as soon as possible!

[znoorsa]

Hi Dear Wanghar!
I Solved the problem by changing R21(in CN0510 Schematic) which is in the Emitter of Darlington pair.
at first place, out of my design requirements I had used 1 Ohm resistor to produce greater current excitation signal which was needed because of u-ohm impedance value, I altered the impedance and after resetting the code I could see my excitation signal at CE0 pin for only few seconds.
I have came across a new problem though! ToT
AD5941 ADC block doesn't work and I cant see any impedance value on my Serial Terminal at all!!

[wanghar]

Thank you znoorsa for your update. However I am not quite sure how you do on the R21. Do you mean you changed the value of R21 from 62 Ohm to 1 Ohm then signal is excitated from CE0 pin?

[znoorsa]

actually I did exactly opposite of what you said, by the way I suggest you to check Analog Devices "Engineer Zone" Forum.
There will be some similar questions about the problem and you can get technical supports.

I think checking this link might be helpful:

https://ez.analog.com/data_converters/precision_adcs/f/q-a/571607/ad5941-waveform-generator-trouble-in-batimpedance-c-example-port/499700

[wanghar]

Thank you znoorsa for your information! Yet able to get the expected readings on NUCLEO-411, there is no signal on CE0. Yes I am trying to find some clue on "Engineer Zone" Forum. At 2023-09-18 21:58:26, "znoorsa" ***@***.***> wrote: actually I did exactly opposite of what you said, by the way I suggest you to check Analog Devices "Engineer Zone" Forum. There will be some similar questions about the problem and you can get technical supports. I think checking this link might be helpful: https://ez.analog.com/data_converters/precision_adcs/f/q-a/571607/ad5941-waveform-generator-trouble-in-batimpedance-c-example-port/499700 — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.Message ID: ***@***.***>