Teensy 3.5

The Teensy is a breadboard-friendly development board with loads of features in a, well, teensy package. Each Teensy 3.5 comes pre-flashed with a bootloader so you can program it using the on-board USB connection: no external programmer needed! You can program for the Teensy in your favorite program editor using C or you can install the Teensyduino add-on for the Arduino IDE and write Arduino sketches for it!

The processor on the Teensy also has access to the USB and can emulate any kind of USB device you need it to be, making it great for USB-MIDI and other HID projects. The 32-bit, 120MHz processor brings a few other features to the table as well, such as multiple channels of Direct Memory Access, several high-resolution ADCs and even an I2S digital audio interface! There are also four separate interval timers, plus a delay timer! Oh yeah, and all digital pins have interrupt capability and are 5V tolerant.

All of this functionality is jammed into a 62.3mm x 18.0mm board with all solder points on a 0.1" grid so you can slap it on a breadboard and get to work! The Teensy 3.5 (as well as its sibling, the Teensy 3.6) is larger, faster and capable of more projects, especially with its onboard micro SD card port. An upgraded ARM Cortex MCU (120MHz from 72MHz), more memory (512K from 256K), as well as more RAM, EEPROM and accessible pins make up the key new features of this “teensy” board. The Teensy 3.5 is slightly scaled down from the Teensy 3.6 but is offered at a cheaper price point, comparatively.

Note: This does not come with a USB cable; please check below for an appropriate one.

  • 120MHz ARM Cortex-M4 with Floating Point Unit
  • 512K Flash, 192K RAM, 4K EEPROM
  • Microcontroller Chip MK64FX512VMD12
  • 1 CAN Bus Port
  • 16 General Purpose DMA Channels
  • 5V Tolerance on All Digital I/O Pins
  • 62 I/O Pins (42 breadboard friendly)
  • 25 Analog Inputs to 2 ADCs with 13-bit resolution
  • 2 Analog Outputs (DACs) with 12-bit resolution
  • 20 PWM Outputs (Teensy 3.6 has 22 PWM)
  • USB Full Speed (12Mbit/sec) Port
  • Ethernet mac, capable of full 100Mbit/sec speed
  • Native (4-bit SDIO) micro SD card port
  • I2S Audio Port, 4-Channel Digital Audio Input & Output
  • 14 Hardware Timers
  • Cryptographic Acceleration Unit
  • Random Number Generator
  • CRC Computation Unit
  • 6 Serial Ports (2 with FIFO and Fast Baud Rates)
  • 3 SPI Ports (1 with FIFO)
  • 3 I2C Ports
  • Real-Time Clock
  • 62.3mm x 18.0mm x 4.2mm (2.5in x 0.7in x 0.2in)

Teensy 3.5 Product Help and Resources

Vox Imperium: Stormtrooper Voice Changer

October 25, 2016

Add some flair to your Imperial uniform by changing your voice using a Teensy 3.2 and Prop Shield.

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

2 Soldering

Skill Level: Rookie - The number of pins increases, and you will have to determine polarity of components and some of the components might be a bit trickier or close together. You might need solder wick or flux.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

2 Programming

Skill Level: Rookie - You will need a better fundamental understand of what code is, and how it works. You will be using beginner-level software and development tools like Arduino. You will be dealing directly with code, but numerous examples and libraries are available. Sensors or shields will communicate with serial or TTL.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

2 Electrical Prototyping

Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
See all skill levels

Customer Comments

  • I need this thing with soldered pins. Do you have one?

    • We currently only have ones without the pins, but we do plan on getting ones with pins soldered on soon, I believe the manufacture is just building and shipping these first. Keep checking back.

  • The video mentions using the ‘octows2812’ library. From what I’ve been able to find on PJRC website/forums/rest of the interent, the octows2811 library currently doesn’t explicitly support the teensy 3.5/6 but I’d love to be proven wrong. I’ve been waiting with bated breath for the octo library to come to the newest teensy’s. Any chance Nick (or anyone) could post up a link to the library used in the video and maybe even the code for running the animation shown in the video?

  • I’ve just noticed that the Teensy 3.x series finally includes access to a built-in RTCC. (Adding a battery and 32768Hz crystal isn’t a big deal, IM[NS]HO.)

    Only one problem: Where does the crystal go on the 3.5 and 3.6? (It’s pretty clear on the 3.2 pin assignment chart, but NOT on the 3.5 or 3.6.)

    • On the back board diagram the ‘interior’ pins (next to the microsd slot but not along the two long flanks) are shown and one is labelled ‘VBatt’ with the subheading that it’s for a 3V coin cell for the RTC. The board itself seems to also have a small ‘VB’ label in the silkscreen but the diagram resolutions isn’t stellar. https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/teensy35_back.pdf

      EDIT: lost track of brain before posting, this forum post over at PJRC also clarifies crystal is built in, and you can make out what looks to be 2 crystals by the reset button. “RTC crystal: The crystal for the RTC is part of the Teensy 3.5/3.6, while on the Teensy 3.2 you have to solder an external crystal.” https://forum.pjrc.com/threads/36613-Why-Teensy-3-5-or-3-6

      • Excellent! Thanks! While preparing a post over on Adafruit, I noticed that there were what might be a 32.768kHz SMD crystal over between the reset button and pin 25/pin 26, but the resolution of the pics available didn’t allow reading the markings (and there’s no schematic available, at least yet). The pjrc.com website isn’t yet listing info about the 3.5/3.6, so was no help either.

        At $25 a pop, the 3.5 may become my “go-to” board, especially for data logging!

        • I bought a couple of 3.5’s, and although I haven’t yet had time to fire them up, I did, just now, look at that possible XTAL under the magnifying glass. It is TEENSY! (pun intended!) The markings, as far as I can make out are “SDG15A”. The DigiKey search engine turned up nothing with those markings, but there are a lot of 32.768kHz SMD crystals that are about that size (about 3.2mm x 1.5mm).

          Hopefully I’ll nave time to solder on some pins and fire one of them up in the next week or so!

          • I’ve now had a chance to play with it a bit. (I had to update my Arduino code to one that will work with Teensyduino.)

            I’ve soldered “header” pins onto a 3.5, and cut a m/m jumper in two and soldered one of the pieces to the Vbat connection. It’s in a solderless breadboard socket, and at the moment, the only wires go to a CR2032 coin cell.

            After a little other tinkering to make sure the system was working, I tried out the TimeTeensy3 demo (which grabs the time from the host computer, and sets the RTCC to that). I then modified a copy, commenting out the setting functions (and adding to the message printed so I know that it’s the version running).

            I unplugged the USB for >10 minutes, and when I plugged it back in, the time corresponds to the Mac’s time, so it sure looks like the RTC is running! EXCELLENT!

  • In comparing the 3.5. and 3.6 write-ups, please confirm that the 3.5 IO pins are 5 volt tolerant; and the 3.6 IO pins are 3.3 volt tolerant. I just want to make sure there wasn’t a typo. :)

    • It’s not a typo.

      Kinetis MK64 are 5v tolerant on digital pins (not analog ones!) Kinetis MK66 are only VDD+0.3v tolerant (so not even 3.3v tolerant it VDD < 3v).

      Hint: check datasheet asbolute ratings for VDDIO.

Customer Reviews

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powerful stuff

i am excited, it has all, what i want