The name of Teensy is well-known.
After Teensy 1.0 and 2.0, which included microcontroller by Atmel company (AT90USB162 v1.0 and ATMega32U4 in v2.0) came the first kickstarter's Teensy 3 in 2012. It included 32 bit microcontroller.
Then (2014) the world saw Teensy 3.1 and 3.2.
If you still don't know what Teensy is, so, it is development board which is supported in Arduino IDE.
Specifications of Teensy 3.5 and 3.6. Teensy 3.5
- 120 MHz ARM Cortex-M4 with Floating Point Unit
- 512K Flash, 192K RAM, 4K EEPROM
- Microcontroller Chip MK64FX512VMD12 (PDF link)
- 1 CAN Bus Port
- 16 General Purpose DMA Channels
- 5 Volt Tolerance On All Digital I/O Pins
Teensy 3.6
- 180 MHz ARM Cortex-M4 with Floating Point Unit
- 1M Flash, 256K RAM, 4K EEPROM
- Microcontroller Chip MK66FX1M0VMD18 (PDF link)
- USB High Speed (480 Mbit/sec) Port
- 2 CAN Bus Ports
- 32 General Purpose DMA Channels
- 11 Touch Sensing Inputs
Both specifications:
- 62 I/O Pins (42 breadboard friendly)
- 25 Analog Inputs to 2 ADCs with 13 bits resolution
- 2 Analog Outputs (DACs) with 12 bit resolution
- 20 PWM Outputs
- USB Full Speed (12 Mbit/sec) Port
- Ethernet mac, capable of full 100 Mbit/sec speed
- Native 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 & Fast Baud Rates)
- 3 SPI Ports (1 with FIFO)
- 4 I2C Ports
- Real Time Clock
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