Teensy 4.0

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Teensy 4.0 is the latest Teensy, offering the fastest microcontroller and powerful peripherals in the Teensy 1.4 by 0.7 inch form factor. It features an ARM Cortex-M7 processor at 600MHz, with a NXP iMXRT1062 chip, the fastest microcontroller available today. Teensy 4.0 is the same size and shape as Teensy 3.2, and retains compatibility with most of the pin functions on Teensy 3.2.

When running at 600 MHz, Teensy 4.0 consumes approximately 100mA current. Teensy 4.0 provides support for dynamic clock scaling. Unlike traditional microcontrollers, where changing the clock speed causes wrong baud rates and other issues, Teensy 4.0 hardware and Teensyduino's software support for Arduino timing functions are designed to allow dynamically speed changes. Serial baud rates, audio streaming sample rates, and Arduino functions like delay() and millis(), and Teensyduino's extensions like IntervalTimer and elapsedMillis, continue to work properly while the CPU changes speed. Teensy 4.0 also provides a power shut off feature. By connecting a pushbutton to the On/Off pin, the 3.3V power supply can be completely disabled by holding the button for 5 seconds, and turned back on by a brief button press. If a coin cell is connected to VBAT, Teensy 4.0's RTC also continues to keep track of date & time while the power is off. Teensy 4.0 also can also be overclocked, well beyond 600MHz!

The ARM Cortex-M7 brings many powerful CPU features to a true real-time microcontroller platform. Cortex-M7 is a dual-issue superscaler processor, meaning the M7 can execute two instructions per clock cycle, at 600MHz! Of course, executing two simultaneously depends upon the compiler ordering instructions and registers. Initial benchmarks have shown C++ code compiled by Arduino tends to achieve two instructions about 40% to 50% of the time while performing numerically intensive work using integers and pointers. Cortex-M7 is the first ARM microcontroller to use branch prediction. On M4, loops and other code which much branch take three clock cycles. With M7, after a loop has executed a few times, the branch prediction removes that overhead, allowing the branch instruction to run in only a single clock cycle.

Tightly Coupled Memory is a special feature which allows Cortex-M7 fast single cycle access to memory using a pair of 64 bit wide buses. The ITCM bus provides a 64 bit path to fetch instructions. The DTCM bus is actually a pair of 32 bit paths, allowing M7 to perform up to two separate memory accesses in the same cycle. These extremely high speed buses are separate from M7's main AXI bus, which accesses other memory and peripherals. 512K of memory can be accessed as tightly coupled memory. Teensyduino automatically allocates your Arduino sketch code into ITCM and all non-malloc memory use to the fast DTCM, unless you add extra keywords to override the optimized default. Memory not accessed on the tightly coupled buses is optimized for DMA access by peripherals. Because the bulk of M7's memory access is done on the two tightly coupled buses, powerful DMA-based peripherals have excellent access to the non-TCM memory for highly efficient I/O.

Teensy 4.0's Cortex-M7 processor includes a floating point unit (FPU) which supports both 64 bit "double" and 32 bit "float". With M4's FPU on Teensy 3.5 & 3.6, and also Atmel SAMD51 chips, only 32 bit float is hardware accelerated. Any use of double, double functions like log(), sin(), cos() means slow software implemented math. Teensy 4.0 executes all of these with FPU hardware.

Note: Please be aware that the Teensy 4.0 does not include headers and will need to be purchased separately and soldered on yourself.

  • ARM Cortex-M7 at 600MHz
  • 1024K RAM (512K is tightly coupled)
  • 2048K Flash (64K reserved for recovery & EEPROM emulation)
  • 2 USB ports, both 480MBit/sec
  • 3 CAN Bus (1 with CAN FD)
  • 2 I2S Digital Audio
  • 1 S/PDIF Digital Audio
  • 1 SDIO (4 bit) native SD
  • 3 SPI, all with 16 word FIFO
  • 3 I2C, all with 4 byte FIFO
  • 7 Serial, all with 4 byte FIFO
  • 32 general purpose DMA channels
  • 31 PWM pins
  • 40 digital pins, all interrrupt capable
  • 14 analog pins, 2 ADCs on chip
  • Cryptographic Acceleration
  • Random Number Generator
  • RTC for date/time
  • Programmable FlexIO
  • Pixel Processing Pipeline
  • Peripheral cross triggering
  • Power On/Off management

Teensy 4.0 Product Help and Resources

Getting Started with the Teensy

June 18, 2015

Basic intro to the Teensy line of products, with soldering and programming suggestions.

How to Load MicroPython on a Microcontroller Board

September 4, 2018

This tutorial will show you how to load the MicroPython interpreter onto a variety of development boards.

Getting Started with the SmartLED Shield for Teensy

November 9, 2018

In this tutorial, we will connect different RGB LED matrix panels to PixelMatix's SmartLED shield and Teensy.

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.

3 Programming

Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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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.
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Looking for answers to technical questions?

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  • I have been eagerly watching Paul's development of this board! I have a couple of projects that will use this as the need the memory and speed. Also there is TensorFlow lite available for this from NXP. When I saw the release yesterday I immediately ordered four. I hope to do a local pickup this morning at 9AM. Can't wait!

  • All this board needs now is a QWIIC connector. :-)

    • I think there were plans for a shield... it may have fallen through the cracks somewhere or maybe they figured customers would prefer jumper cables instead. I'll try to follow up with what happened with that.

  • I'm on Linux (Manjaro), and I've been using teensy-loader-cli with previous versions of Teensy. I checked their github and Teensy4.0 is not supported, and Teensy Loader GUI is not working with 4.0 neither. What are my options (except for waiting)?

  • What is the maximum sampling rate from one dedicated 12 bit ADC on the Teensy 4.0? I have some high sampling rate applications in mind and was curious how fast it can go.

  • What pins are used to connect an SD card to this board? And can I use a standard SD card breakout board for this (SPI and power pins)? Thanks.

  • The only thing I don't like is that they always sell them without the pins, and this one (4.0) shows no sign of a DAC pin/pins

    • Are you asking about an option with headers? I believe we do sell a few of the Teensy 3.x boards with header options and (if I remember correctly) they do have DAC pins available. I'd have to double-check the information on the 4.0.

      (*Otherwise, I am not sure I understood the issue.)

      • Not the OP, but let me reply:

        (1) A version of 4.0 with headers already attached will probably soon be available, and I hope it's soon. Some of us hate having to solder headers (as one gets older, focusing at short distances gets harder).

        (2) A bigger thing is adding proper DAC to the 4.0. Yes, the 3.6 has DAC, but it looks like the 4.0 doesn't. PWM isn't quite the same thing. I'd be interested if anybody had thoughts on how best to add DAC to the 4.0.

        • (1) My apologies, I thought you meant we sold none of the Teensy boards (from the entire product line) with headers. Unfortunately, we don't control when/if PJRC releases a header version. From past experience, you may just need to wait. Otherwise, if you are in a rush to start developing:

          • The board is compatible with the header kit
          • If you live in an area with a maker/DIY/hacker-space, I am sure you can find a person/kid who would be willing to solder that up for you.

          (2) If you are looking for technical assistance. Please use the link in the banner above, to get started with posting a topic in our forums. Our technical support team will do their best to assist you.

          That being said, this question might be better suited for PJRC's forums (as they designed and built the Teensy 4.0). Otherwise, here is a link to link to the datasheet for the microprocessor used on the Teensy 4.0 that PJRC lists. There is a note in the datasheet for a 6-bit DAC, but I am not sure if it is implemented on the board in hardware or software (teensyduino).

  • So much processing power, so few I/Os, so many shared pins. Sad.

    • How many more pins do you need and where would you put them on a board this size?

    • 40 total...all can do digital, 31 of them can do PWM, and of course the other types of I/O are shared. But I don't see too much of the more specific I/O types that conflicts with others. What else in the same ballpark competes?

      Mainly just making sure that no one misses that there are 16 more I/O connections on the underside of the board, if you need them. (Ideally a long form board could be coming at come point with all as header pins, I would like that myself.)

  • and how much power does it draw approximately ?

  • What's the voltage level on the I/O pins? I'm assuming 3.3v but are they 5v tolerant like the 3.5?

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