Teensy 4.0

Teensy 4.0: High Performance in a Compact Form

The Teensy 4.0 is a powerful, compact development board measuring just 1.4" × 0.7". It features the blazing-fast 600 MHz ARM Cortex-M7 processor, built on the NXP iMXRT1062 chip — currently the fastest microcontroller available.

Maintaining the same size and pin layout as the Teensy 3.2, the Teensy 4.0 ensures broad compatibility with existing projects. At full speed, it draws approximately 100 mA, and supports dynamic clock scaling. Unlike typical microcontrollers, it maintains accurate baud rates, sample rates, and Arduino timing functions (like delay(), millis(), IntervalTimer, and elapsedMillis) even as the CPU speed changes.

Additional features include:

• Power control: A long press (5s) on an external pushbutton connected to the On/Off pin fully disables the 3.3V supply. A short press turns it back on.

• Real-time clock (RTC): With a coin cell connected to VBAT, the RTC keeps time even when the board is powered down.

• Overclocking: Teensy 4.0 can be pushed beyond its rated 600 MHz for even more performance.

Advanced Architecture

The Cortex-M7's dual-issue superscalar architecture allows it to execute two instructions per cycle, greatly improving performance — especially with optimized C++ code. It also features branch prediction, dramatically reducing overhead in loops.

The chip includes Tightly Coupled Memory (TCM):

• ITCM: 64-bit instruction fetch path

• DTCM: Dual 32-bit data access paths
  Up to 512 KB of TCM enables lightning-fast memory access, while non-TCM memory is optimized for DMA, ensuring smooth operation of peripherals.

Floating Point Unit (FPU)

Unlike previous ARM microcontrollers, the Teensy 4.0 supports both 32-bit (float) and 64-bit (double) floating-point operations in hardware. This enables fast execution of mathematical functions like log(), sin(), and cos() without resorting to slow software emulation.

Note: Headers are not included with the Teensy 4.0 and must be purchased and soldered separately.