Workbench
QSP32 Solar Boost

Differential pairs!

Matched signals for USB to UART communication

Differential pairs!

We recently added support to Quilter for differential pairs and I could not wait to try the feature out on the QSP32 Solar Boost!

When I uploaded my schematic, Quilter automagically detected the pairs between USB and UART.

Schematic clip showing where a set of differential pairs are located.
Quilter's UI automatically detects differential pairs

Quilter did a great job of placing the FTDI chip close to the USB-C connector.

I put probes on DP_P and DP_N (white arrows). These traces go between a UART chip (top) and a USB-C connector (bottom). The layout of the differential pairs have precise length matching for good signal integrity.

White arrows pointing to where probes are on DP and DN

Take a look at these perfectly mirrored signals! This feature works perfectly, I had three boards fabbed and each one connects instantly to upload sketches.

Differential Pairs signals at DP and DN

Next up: energy harvesting from a tiny solar panel

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