Teensy 4.1
The Teensy 4.1 is the latest Teensy, offering the fastest micocontroller and an expanded set of powerful peripherals in a 2.4 by 0.7 inch form factor. In common with the Teensy 4.0, it can be programmed using the Arduino IDE with Teensyduino add-on. Teensy 4.1 is designed to bring all general purpose I/O pins to breadboard friendly pads on the outside edges.
While it shares many similarities with the Teensy 4.0 there are some important differences.
| Feature | Teensy 4.1 | Teensy 4.0 |
|---|---|---|
| Ethernet | 10 / 100 Mbit DP83825 PHY (6 pins) | – none – |
| USB Host | 5 Pins with power 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 chips Plus 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 |
All Teensy boards are shipped assembled (without headers) and fully tested.
Teensy 4.1 & 4.0 use the same IMXRT1062, so most technical specifications are the same.
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. PJRC is planning to offer this as a DIY kit in the near future. You can also make the connection by soldering wires.
These parts are recommended to build the Ethernet connection.
| 1 | Ethernet Magjack | |
| 2 | Header, 3×2, 2mm pitch | Digikey 1849-1000-ND |
| 2 | IDC Socket, 3×2, 2mm pitch | Amphenol FCI 89361-706LF, Digikey 609-3139-ND |
| 1 | Ribbon Cable, 3 to 6 inch | Digikey HF06S-5-ND |
| 1 | Capacitor, 0.1uF, 805 | |
| 1 | Capacitor, 1uF, 805 | probably not needed |
| 1 | Capacitor, 1nF, 805 | optional, should be high voltage rated if used |
| 1 | Resistor, 1M | optional |
| 1 | Circuit Board | OSH Park Shared PCB |
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.
For additional specs and information, please also look at the manufacturer’s webpage – Teensy 4.1 Product Page at PJRC
Teensy Documents:
