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Why are my two still operating OK at a VBat of a little over 4.195 V after the diode then? I do not see that it has any detrimental effects. Give me a timeline on when the chip will fail if the Max

Folks, For the android App you need to be running at least android 6.? I tried to install it on an old samsung galaxy note and, when I searched the playstore, it was not listed.? Checking again with

Oristo, according to STM32F072 datasheet, the safe voltage for VBAT is 3.6 V and it should not exceed 4.0V otherwise it leads to permanent damage. Li-Ion battery has max voltage 4.2 V. Today I tested

The safe operating voltage for VBAT is 3.6 V, so this is why there is needs diode with voltage drop

According to datasheet VBAT pin has absolute maximimum rating 4.0 V MAX. This limit already takes into account internal dividers and other circuit. If you exceed it it may damage device. Datasheet

I think this is an interesting design discussion, because it can have a long term impact on what we do... I have not had time to research further, but the point about what it powers is relevant In

That chip is seemingly related to those in small LED flashlights, where various switch press sequences select on vs off vs blink, but nanoVNA lacks pushbutton access. My nanoVNA played dead

Mike, Please have a look at the 4th VBAT match on this webpage: http://embedded-lab.com/blog/stm32s-internal-rtc/? 4V? is the max you can stick on VBAT before the silicon is overly stressed and the

I'm talking about the voltage the Vbat sense pin "sees" - it goes into a voltage divider for voltage monitoring. Yes the backup battery powers things but at that point it is what it is in the Nano

Hi Elia, The output of the NanoVNA is a square wave consisting of a fundamental below 300MHz and its harmonics above.You would need to take all that into account in addition to the discrete freq steps

Actually, it DOES power the RTC in addition to being monitored.? What would Vbat-Vss give you? ...? since Vss is Gnd and at 0V and Vbat-Vss is 4V max as specified, you need the diode (or two) or

Hi All, I have a question that I hope someone here can shed some light on. I do not have a spectrum analyser and was wondering if the nanoVNA can somehow be used to perform IP3 and IMD measurements of

I know what it says elsewhere in the datasheet for maximums, but I think it's not that simple for Vbat. Snippet from datasheet - 3.10.3 VBAT battery voltage monitoring This embedded hardware feature

Vaclav, Keep in mind that the ONLY stupid question is the one you DIDN'T ask. Some folks haven't learned that yet. Bruce Nebergall, K4TQL

It may actually be more beneficial to run dual OSes on that machine: XP and Linux In fact, why not run Linux as the base OS and XP in a VM or even drop XP in favour of WINE? Who knows - WINE may run

Hello Tony, The application is written in Python 3.7, and using PyQt5 5.11 as the UI library. Python is not available from version 3.5 on XP, and PyQt5 support ended at 5.5, as far as I can tell. The

Apparently only for 7+ now... -- On the banks of the Piscataqua Rich NE1EE

I was not going to continue, but...seeing this...In the conduct of running my engineering company, I have spoken with several Li-ion charging system vendors, and especially those who supply batteries

The ADALM-Pluto is another alternative, and has the bonus of being a full-duplex receiver too. It used to sell for ?99, but is still reasonable at ?120 (

Folks, it's called _ NanoVNA _ in the Google Play store. Please do a search.? Android 5 is too old - I believe you need 7 and up for this.? As for the webapp name - there are two: NanoVNA-WebUSB and