Electronics > Beginners
Reading ADC without voltage divider
<< < (3/3)
Mechatrommer:

--- Quote from: Rick Law on December 28, 2018, 04:03:07 am ---
--- Quote from: Mechatrommer on December 27, 2018, 11:21:53 am ---another way is differential amplifier...

--- End quote ---
With 13 LiIon in series, the total voltage is 13x4.2v=54.6v.

--- End quote ---
very well, i didnt read the 13S part.. use voltage divider then where necessary, and then amplify back the differential reading. problem solved adc resolution preserved ;D i believe there are high voltage opamp part but i wont bother searching because the price will be prohibitive... ymmv.

Psi:

--- Quote from: Ian.M on December 28, 2018, 05:09:37 am ---
--- Quote from: Psi on December 27, 2018, 11:28:36 am ---Or you could get batshit crazy and use 13x padauk 3 cent mcus.
One running from each lipo tap to read its voltage and output differential digital data back to the main mcu using some series caps to isolated the data bus :-DD

--- End quote ---
Maybe not so crazy as the MCUs for each cell could also each control a MOSFET for balancing, and its probably going to be cheaper than the other options, and draw less current from the cell than most of them.  However the MCUs need to have an internal reference, (which you'll probably need to calibrate), and I doubt you'll find that in a 3 cent MCU.

--- End quote ---

Looks like the cheapest one that has both a 12bit ADC and 1.2V bandgap is PMS131-S08
which is 8 cents in 100qty
https://lcsc.com/product-detail/PADAUK_PADAUK-Tech-PMS131_C114159.html
Navigation
Message Index
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod