PJRC Teensy 4.0 - Sparkfun DEV-15583
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.
Teensy 4.0 can be programmed using the Arduino IDE with Teensyduino add-on.
Teensy 4.0 features a seriously fast ARM Cortex-M7 processor clocking in at 600 MHz, with a NXP iMXRT1062 chip
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.
Teensy 4.0 consumes approximately 100 mA current, when running at 600MHz.
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 600 MHz!