Datasheet

Guided Tour

Let me take you on a tour of your Trinket! Each trinket is assembled here at Adafruit and comes chock-full of good

design to make it a joy to use.

Micro-B USB connector - We went with the ultra-common micro-B USB connector for power and/or USB

bootloading. We use a special half SMT/half thru hole connector with extra big pads so the connector is very

strong. It's also a proper USB connector, so you can use any length cable. Don't forget to use a data+power USB

cable if you want to bootload! Some really inexpensive USB cables are 'power only'

Green Power LED - you'll know that the board is powered up when this bright LED is lit

Red #13 LED - this LED does double duty. Its connected with a series resistor to the digital #13 GPIO pin. It pulses

or blinks nicely when the Pro Trinket is in bootloader mode, and its also handy for when you want an indicator

LED.

Battery + Input - take your Trinket anywhere and power it from an external battery. This pin can take up 16V DC

input, and has reverse-polarity, over-curent and thermal protections. The circuitry inside will use either the

battery or USB power, safely switching from one to the other. If both are connected, it will use whichever has the

higher voltage

USB Power Output - You can also snag the 5V power from the USB jack in case you need 500mA+ current from

your computer or portable USB power pack.

Breadboard friendly pins - You can easily plug this into a little breadboard and have plenty of space for working

and plugging stuff in

GPIO pins - 18 GPIO pins + 2 analog-only pins, at 3 or 5V logic, check the next section for a detailed pinout guide

3 or 5V output - an onboard regulator provides 3.3V or 5V output for powering LEDs, sensors, small motors, etc.

Reset Button - an onboard reset button will launch the bootloader when pressed and the Trinket is plugged into

a computer. If it is not connected to a computer, it's smart enough to go straight to the program.

External Reset Pin - we bring out the reset pin so you can reset or restart your Trinket on the road. If the Trinket

is in a box or otherwise hard to get to, you can wire up a button to this pin for an external reset button.

Three mounting holes make it easy to attach with 2mm screws (M2 metric or #2 imperial) or even tiny zip-ties,