Hello, I am attempting in voltage stacking of 2 STM32WB55 board, but unlike arduino I could not connect Top board's GND to bottom board's 3.3 V pin. I would like to request for help or insights for alternative method I could make it work. I would really appreciate the help.
Problem
1. When I connect the Top STM32 GND to the VDD of Btm STM32, it discharged the voltage in Btm capacitor.
2. On one attempt I rearranged the circuit in similar stacked configuration, it did not discharged the Btm capacitor voltage. Instead the system goes haywire.
Thank you.
Thanks for adding the diagram - these things are so often better described by a diagram than in words.
But some more detail is required:
- How, exactly, did you connect the boards together?
Please provide a schematic.
- What problem(s), exactly, did you encounter?
Also, what is the purpose of connecting the boards like that anyhow?
Why not just have them separate, or in parallel?
This is my research topic for my bachelor degree. I am attempting on a power management method called voltage stacking, it is commonly used on transistor level design. The advantage of doing voltage stacking or in series arrangement is the reduction of current demand of each domain that are stacked, following V = IR.
My goal is to find out that in an energy harvesting system, could I achieve what is observed on transistor level if I attempt voltage stacking, which is halving of current demand or 1/n where n is the number of stacked layers. I had tried out the parallel arrangement and observed the data but I faced problem when trying to connect them in series.
1. When I connect the Top STM32 GND to the VDD of Btm STM32, it discharged the voltage in Btm capacitor.
2. On one attempt I rearranged the circuit in similar stacked configuration, it did not discharged the Btm capacitor voltage. Instead the system goes haywire.
I attempt voltage stacking with arduino initially I had attached the image below, I know it looks disturbing or obnoxious but with this I could observe a near halving of current demand compare to conventional parallel arrangement. Currently, is that I would like to replicate similar result with STM32 boards.
But microcontroller boards aren't just simple resistive devices that you can connect in series, and apply Ohm's law.
They contain voltage regulators, and other non-linear stuff.
Current consumption is discontinuous, and the two boards will not be drawing the same current at the same time.
@methene wrote:The advantage of doing voltage stacking or in series arrangement is the reduction of current demand of each domain that are stacked,
I don't see how your arrangement achieves that:
This is not a series connection!
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