Teensy 4.0, Lockable

Meet the Teensy 4.0, a compact development board that packs one of the fastest microcontrollers available today into a familiar Teensy footprint. This special Lockable version is designed for production and commercial applications, providing all the power of the standard Teensy 4.0 with the crucial ability to secure your code. This board is built around an ARM Cortex-M7 CPU running at 600 MHz, supported by 1MB (1,024KB) of RAM and 2MB (2,048KB) of Flash memory (with 64KB reserved for EEPROM emulation).

The Teensy 4.0 maintains the same size, shape (1.4 x 0.7 inches), and breadboard-friendly layout as the Teensy 3.2 and retains compatibility with most pin functions, making it a powerful drop-in replacement for your most demanding projects.

Production-Grade Code Security

This Lockable version of the Teensy 4.0 is intended for developers who are ready to move from prototype to a final, secure product. While a standard Teensy is "unbrickable" and ideal for development, this model provides write access to the chip's eFuses, allowing you to lock the device into a secure mode permanently.

Once you program your unique encryption key and lock the device, your application code is encrypted. This prevents unauthorised reading, cloning, or modification of your intellectual property. In secure mode, the JTAG debug port is permanently disabled, and the microcontroller will only run code that has been encrypted with your private key.

Warning: This is a one-way, irreversible process. This board is for advanced users finalizing a product. Setting the fuses incorrectly can permanently "brick" the device. For all development and prototyping, please use the standard Teensy 4.0.

The Power of the Cortex-M7 Core

At the heart of the Teensy 4.0 is the NXP MIMXRT1062DVL6B, a chip that establishes the "Crossover MCU" category. This processor is engineered to bridge the gap between low-cost, real-time microcontrollers and high-performance application processors. NXP packed the high-speed 600 MHz Cortex-M7 core into a compact 144-pin package, allowing the Teensy 4.0 to deliver all the power you'll need in a tiny footprint. It combines this speed with an architecture capable of extremely low-latency, real-time responses, and a rich set of high-speed peripherals.

• Dual-Issue Superscalar Processor: The M7 isn't just fast; it's efficient. It can execute two instructions per clock cycle at 600 MHz. Benchmarks show C++ code compiled by Arduino can achieve this dual-instruction execution 40-50% of the time, dramatically accelerating numerically intensive work.
• Branch Prediction: This is the first ARM microcontroller to use branch prediction. Where other microcontrollers (like the M4) waste three clock cycles on loops, the M7's branch predictor learns the loop and removes that overhead, allowing the branch instruction to run in a single clock cycle.
• Hardware FPU: The built-in Floating Point Unit (FPU) crushes maths operations. Unlike many microcontrollers that only accelerate 32-bit floats, the Teensy 4.0's FPU provides full hardware acceleration for both 64-bit "double" and 32-bit "float" types. Complex functions like log(), sin(), and cos() are executed at full hardware speed, not through slow software emulation.

Advanced Memory Architecture

To keep the 600 MHz CPU fed with data, the Teensy 4.0 utilizes Tightly Coupled Memory (TCM). This special feature allows the Cortex-M7 to use 512K of its 1024K total RAM as incredibly fast, single-cycle access memory via a pair of dual 64/32-bit high-speed buses (one for instructions, one for data).

The Teensyduino environment automatically allocates your sketch code into this blazing-fast memory. This high-speed access is separate from the main AXI bus, allowing powerful DMA-based peripherals to access other memory with excellent efficiency, thereby minimising I/O bottlenecks.

Smart Power Management & Flexibility

The Teensy 4.0 is a powerful yet efficient microcontroller, consuming approximately 100mA when running at 600 MHz.

• Dynamic Clock Scaling: You are not locked into one speed. The Teensy 4.0 provides full support for dynamic clock scaling. Unlike traditional microcontrollers, changing the CPU speed on the fly will not break your serial baud rates, audio streaming sample rates, or Arduino timing functions like delay() and millis().
• Power On/Off: For low-power or battery-operated projects, a dedicated On/Off pin allows you to completely disable the 3.3V power supply. Simply connect a pushbutton and hold it for five seconds to power down. A brief press turns it back on.
• RTC Support: If a coin cell is connected to the VBAT pin, the Teensy 4.0’s Real-Time Clock (RTC) will continue to keep track of date and time even when the main power is off.
• Overclocking: For those who push the limits, the Teensy 4.0 is also capable of being overclocked well beyond 600 MHz!

With its combination of raw speed, advanced architecture, and intelligent power features, the Teensy 4.0 provides a level of performance previously unattainable in the microcontroller world, opening up entirely new possibilities for complex and demanding projects.

Note: You can find information about code security & lockable Teensy here.

• Manual (MIMXRT1062 DVL6B)
• Datasheet (MIMXRT1062 DVL6B)
• Datasheet (W25Q16JV-DTR)
• Teensy Quick Start
• Teensyduino Software
• Pin Assignment Charts
  • Front
  • Back
• Teensy Help Page and FAQ
• Teensy Compliance Documentation
• Code Security & Lockable Teensy