Teensy 4.1 features the fastest microcontroller and an expanded set of powerful peripherals in a 2.4 by 0.7 inch form factor. Teensy 4.0 can be programmed using the Arduino IDE with Teensyduino add-on. Technical Specifications Compared to Teensy 4.0 Teensy 4.1 & 4.0 use the same IMXRT1062, so most technical specifications are the same. Please refer to the Teensy 4.0 page for common specifications and features. Feature Teensy 4.1 Teensy 4.0 Ethernet 10 / 100 MbitDP83825 PHY(6 pins) -none- USB Host 5 Pins withpower management 2 SMT Pads SDIO (4 bit data) Micro SD Socket 8 SMT Pads PWM Pins 35 31 Analog Inputs 18 14 Serial Ports 8 7 Flash Memory 8 Mbyte 2 Mbyte QSPI Memory 2 chipsPlus Program Memory Program memory only Breadboard Friendly I/O 42 24 Bottom SMT Pad Signals 7 16 SD Card Signals 6 0 Total I/O Pins 55 40 Pinouts Teensy 4.1 is designed to bring all general purpose I/O pins to breadboard friendly pads on the outside edges Ethernet To use the Ethernet port, a magjack and capacitor need to be connected. This is currently available only as a DIY project using this OSH Park Shared Circuit Board. Memory Expansion The bottom side of Teensy 4.1 has locations to solder 2 memory chips. The smaller location is meant for a PSRAM chip. The larger location is intended for flash memory. USB Host Teensy 4.1's USB Host port allow you to connect USB devices, like keyboards and MIDI musical instruments. A 5 pin header and a USB Host cable are needed to be able to plug in a USB device. USB hubs may be used if more than 1 device is needed. See the USBHost_t36 examples for details.
