My current project is using the Teensy 3.2 along with an Adafruit PowerBoost 1000C and some other boards...
Teensy 3.2 has a fuse and a tiny trace that add up to 0.7 ohms of resistance between the inbound USB V+ and the Teensy Vusb pin. This is enough to put the Vusb voltage below the USB spec with most host/cable rigs, and it means I can't feed a powerboost 1000C board from that pin. The raw USB V+ isn't available on any pin or pad, so I'll have to short across the fuse. I probably should pull the bypass cap as well, since the powerboost already has one ...
I'm thinking that a future revision might make it easier to get at the raw USB V+ when that's what's wanted. All the USB lines, actually
I guess in my next version the motherboard will need to have its own USB connector & will just send D+ and D- to the Teensy, and power & ground to the PowerBoost board.
Teensy 3.2 has a fuse and a tiny trace that add up to 0.7 ohms of resistance between the inbound USB V+ and the Teensy Vusb pin. This is enough to put the Vusb voltage below the USB spec with most host/cable rigs, and it means I can't feed a powerboost 1000C board from that pin. The raw USB V+ isn't available on any pin or pad, so I'll have to short across the fuse. I probably should pull the bypass cap as well, since the powerboost already has one ...
I'm thinking that a future revision might make it easier to get at the raw USB V+ when that's what's wanted. All the USB lines, actually
I guess in my next version the motherboard will need to have its own USB connector & will just send D+ and D- to the Teensy, and power & ground to the PowerBoost board.