VoltLink revB CP2102N USB Serial Bridge & ESP32 Programmer | Voltlog #396

Welcome to a new Voltlog, a rather short video for today. I’m gonna be introducing this little guy. You might recognize the design, it’s my VoltLink USB to Serial Converter but in it’s latest revision B which has a few important upgrades over the previous one and these are things that I noticed while using the module almost daily so I think you will all agree with me that these were some good improvements that justified revB.

In general I tried to keep the board the same size, because I like this form factor, the arrangement of the connectors, the fact that I have my own VoltLink standard JST connector that i use for all of the boards that I design so all of that stayed the same but due to the ongoing chip shortage I had to pick a slightly different usb to serial chip, we are now using the CP2102 in QFN28 package. So generally this chip is very similar to the previous version except that it’s a bit newer but you still get up to 3M baud rates which is great. Because of the new chip this meant redesigning the passives to support this new chip and redoing the layout.

Also because of the ongoing chip shortage, prices for electronic components have gone up in the past year and I will have to run the numbers for this particular design but I have no choice but to increase the cost of the unit on my Tindie store if I am to continue making these.

I also upgraded to a USB full speed rated ESD protection diode with lower capacitance TPSP0503, this should mean no connection issues while at the same time offering the recommended protection level on the USB connection together with the PTC resettable fuse.