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rnicolas / BQ25570EVM

Evaluation Module for bq25570 chip from Texas Instruments
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Question related to BQ25570 #1

Open martinius96 opened 4 months ago

martinius96 commented 4 months ago

Hello there, I haven't found any other option to contact you.

I wasn't able to open schematics. Can you tell me, for what is supercap used on BQ25570? Is it used to be able to run BQ25570 from 330 mV instead of 600 mV? Older revisions of BQ25570 says, it is running from 330 mV, latest says it is running from 600 mV. Is this supercap in your case used similar to CJMCU-2557 board? For that board I have found just one schematics that does not have supercap there marked with 0,22F, so not sure if that scheme is correct. So for that I am unable to identify for what it is used. If it is on input from energy harvesting source, or at battery charging, or at VOUT 3.3V?

rnicolas commented 4 months ago

If I remember correctly, the supercapacitor was used as an energy storage device, similar to a battery, to accumulate harvested energy. It also served as a power source to keep the circuit operational when there wasn't enough harvested energy available. I recall conducting some tests, but I'm not certain about the specific input voltage of 330mV - that detail may not be accurate. Please note that it has been about 4 years since I worked with that component, so I don't remember all the specifics and characteristics of that component.