Need to confirm USB battery\Teensy charging circuit

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kdharbert

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I have been using the Adafruit Teensy Feather Adaptor as a convenient breakout board that also has a lipo charger. The charge circuit handles the USB\VIN switchover so the USB\VIN solder pad does not need to be broken on the Teensy.

I need to a make a custom PCB and need to clone the charge circuitry in schematic below, and there are some things I don't get. There are two separate caps (10uF,1uF) added between Teensy's 3.3v output and GND. I don't get what these do. Any help?

[Edit] I also see that the VUSB pin doesn't seem to connect to anything? If VUSB and VIN are connected, I guess this isn't a problem, but if not I don't get why the pin would be used at all.

Also, if there's a more by-the-book design out there that people use for Teensy's please forward.

https://github.com/adafruit/Adafruit-Teensy-3.x-Feather-Adapter-PCB
 
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