This small Teensy 4.0 breakout board is designed to fit into small spaces and allow for the use of two of the Teensy's most-useful features: Native SDIO SD-Card and USB-Host. It is just 44.4 x 40mm in size and has a Micro-SD card port and USB type A port with all of the required supporting hardware.

Teensy 4.0 NOT INCLUDED

FEATURES

Micro SD-Card port

• Native 4-Bit SDIO support
• 8-pin detachable FlatFLEX cable for Teensy
• Supports full-speed operations up to 600Mhz CPU speed
• Supports SD, SDFAT, uSDFS Arduino libraries
• Tested up to 64GB class 10 SD card - may support higher capacities

USB-Host

• Type A, Female
• TPS2055AD Power Driver - outputs ganged to provide >500ma output
• 4.7uf capacitor

TEENSY GPIO

• NOTE: Teensy 4.0 GPIO pins are NOT 5v tolerant - 3.3v input MAX
• Teensy removable for use in other projects
• Most Teensy GPIO pins broken out with headers for easy access
• GPIO 34-37 NOT broken out to avoid interfering with SD-card
• 13 high-quality POGO allow access to GPIO connections on bottom of Teensy
• POGO pin alignment tool makes installing POGO pins easy and protects the socket when Teensy not installed

POWER

• MOSFET provents back-powering Teensy USB port
• 2.5mm right-angle MOLEX power connector - 5V MAX input
• 2.5mm right-angle MOLEX VBAT connector - 3V MAX input
• ON/Off button

This board is shipped unassembled with all SMD components installed. All headers and connectors must by installed by the buyer. You can optionally elect to have the board shipped fully-assembled for a nominal charge.

Design files and test Arduino sketch can be found in my github repository here

You must install Teensy 4.0 support in the Arduino IDE for the test sketch to work

INCLUDED IN PACKAGE

• Breakout Board
• Vertical USB-A connector
• 2 2.54mm male MOLEX connectors
• 2 Female MOLEX shrouds with pins
• 2 14-pin female connectors to mount Teensy
• 1 6-pin connector to mount Teensy
• Male pin-headers to mount Teensy
• 8-pin SMD FlatFLEX connector for bottom of Teensy - Installed if Teensy ordered with Board
• 8-pin FlatFLEX cable
• Male pin headers to breakout GPIO pins
• 13 POGO pins
• POGO-pin alignment tool