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This is not true. The diodes make sure that no input rises above Vdd+0.6V, whatever Vdd is, to a certain extent. The 4V max is the maximum voltage "acceptable" to be applied Also, not true in itself.

Volts is not enough, because almost fully charged battery and fully discharged battery, both have 3 Volts :)

You can use NanoVNASharp MOD V3: https://www.rtl-sdr.com/forum/viewtopic.php?f=4&t=4881#p12524 It works on Windows XP and has most of needed functionality, include capture screenshot button and TDR :)

In general: The death of an IC or damage when subjected to voltages outside its maximum ratings is not *guaranteed*. That explains why the VNAnano does not die from Vbat of 4.01V, nor 4.1V or even

What diode are you using? Thanks... 73 -- On the banks of the Piscataqua Rich NE1EE

I'll try again...it would not install on my Android 6x device, but I'll revisit. ~R~ -- On the banks of the Piscataqua Rich NE1EE

For those intrepid souls who want to push the limits of the older Android devices, you can download the NanoVNA Android app latest release from the developer's github webpage: ?? Latest release is

Agreed that this is sensible... 1) I seem to recall that VBAT can go as low as 1.5V and still power the RTC et al. Not verified. 2) We are discussing this only for battery voltage indication, so an

The real reason the voltage is limited to 4V is due to the ESD protection diodes in the device. There is a diode between all inputs and VDD, so if a voltage greater than a diode drop above VDD is

Not wanting to flame...but I seem to recall seeing a comment about VBAT seeing VDD+0.6V at startup under some conditions...I'll have to see if I can find it...that seems to imply that VBAT can see

Visual C ++ is required to render the graphics, so if you can, there is hope. I tried to install on windows 7-32 bit machine that lacked the SP1 service pack and couldn't install it. I tried Python

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