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Teensy 4.1 Pinout

Teensy 4.1 from PJRC is one of the most powerful boards that still fit on a breadboard. The NXP i.MX RT1062 processor (Cortex-M7) runs at 600 MHz, and the board adds Ethernet, a microSD slot, USB Host and room for extra memory.

It’s programmed in the Arduino IDE with the Teensy package – and thanks to its performance it’s well suited for audio processing, MIDI or fast motor control.

Specifications

  • i.MX RT1062: Arm Cortex-M7 at 600 MHz
  • 1 MB RAM (512 kB of it tightly coupled), 8 MB flash
  • pads for PSRAM or extra flash (QSPI) on the bottom side
  • 55 digital pins (42 on the headers), 35× PWM, 18 analog inputs
  • 8× UART, 3× SPI, 3× I2C, 3× CAN (one supports CAN FD), 2× I2S, S/PDIF
  • 10/100 Ethernet (RJ45 jack via kit), USB Host, microSD slot
  • micro USB, 3.3 V logic, 61 × 18 mm

The smaller Teensy 4.0 has the same processor but fewer pins, and it lacks Ethernet and microSD. The Teensy package is installed through the Boards Manager in the Arduino IDE, and uploading is handled by the Teensy Loader application.

Pinout and pin table

Hover over a pin in the diagram or a table row; use the filter to highlight a bus. You can download the pinout as PNG or SVG.

Pin names:
Teensy 4.1 – pinoutTeensy 4.1 – pinoutchiptron.eu · CC BY 4.0i.MX RT1062micro USBmicroSD5VD-D+GNDGNDTX+TX-RX+RX-LEDGNDVUSB GND 0 PWM RX1 CS1 CRX2 1 PWM TX1 MISO1 CTX2 2 PWM OUT2 3 PWM LRCLK2 4 PWM BCLK2 5 PWM IN2 6 PWM OUT1D 7 PWM RX2 OUT1A 8 PWM TX2 IN1 9 PWM OUT1C 10 PWM CS MQSR 11 PWM MOSI 12 PWM MISO MQSL 3V3 ← 3.3 V output, max. 250 mA 24 PWM A10 TX6 SCL2 25 PWM A11 RX6 SDA2 26 A12 MOSI1 27 A13 SCK1 28 PWM RX7 29 PWM TX7 30 CRX3 31 CTX3 32 OUT1B VIN ← Power 3.6–5.5 V (tied to VUSB) GND 3V3 → 23 PWM A9 CRX1 MCLK1 22 PWM A8 CTX1 21 A7 RX5 BCLK1 20 A6 TX5 LRCLK1 19 PWM A5 SCL 18 PWM A4 SDA 17 A3 TX4 SDA1 16 A2 RX4 SCL1 15 PWM A1 RX3 S/PDIF IN 14 PWM A0 TX3 S/PDIF OUT 13 PWM SCK LED GND 41 A17 40 A16 39 A15 38 A14 37 PWM CS 36 PWM CS 35 TX8 34 RX8 33 PWM MCLK2 VBAT → 3 V backup cell for the RTC clock 3V3 ← ON/OFF ← Button to GND: 4 s turns off, 0.5 s turns on PROGRAM ← Logic 0 = download mode (like the button) GND GPIO UART I2C SPI CAN ADC (analog) PWM I2S (PCM) Power Ground (GND) Control / reset

Bottom side

Teensy 4.1 – pinout (bottom side)Teensy 4.1 – pinout (bottom side)chiptron.eu · CC BY 4.001223322421520619718817916101511141213244125402639273828372936303531343233 USB D- ↔ USB (device) – D−, pad on the underside next to the connector 52 QSPI D0 53 QSPI CLK 54 PWM QSPI D3 USB D+ ↔ USB (device) – D+, pad on the underside next to the connector 51 PWM QSPI CS1 50 QSPI D2 49 QSPI D1 48 QSPI CS0 GPIO PWM Control / reset
Download:PNGSVG
Download – Bottom side:PNGSVG
License: CC BY 4.0 · How to credit
Pin table – Teensy 4.1
NameDirectionUARTI2CSPICANPWMI2S (PCM)ADCNote
0input/outputRX1CS1CRX2PWMSerial1 RX, SPI1 CS, CAN2 RX
1input/outputTX1MISO1CTX2PWMSerial1 TX, SPI1 MISO, CAN2 TX
2input/outputPWMOUT2
3input/outputPWMLRCLK2
4input/outputPWMBCLK2
5input/outputPWMIN2
6input/outputPWMOUT1DI2S1 data output D (RX data 1 for multichannel inputs)
7input/outputRX2PWMOUT1A
8input/outputTX2PWMIN1
9input/outputPWMOUT1CI2S1 data output C (RX data 2 for multichannel inputs)
10input/outputCSPWMMQS audio output – right channel
11input/outputMOSIPWMAlternatively CAN1 TX (FlexCAN_T4)
12input/outputMISOPWMMQS audio output – left channel
13input/outputSCKPWMOrange LED (via 470 Ω to GND) – do not use INPUT_PULLUP
14input/outputTX3PWMA0S/PDIF output (Audio)
15input/outputRX3PWMA1S/PDIF input (Audio)
16input/outputRX4SCL1A2
17input/outputTX4SDA1A3
18input/outputSDAPWMA4
19input/outputCTS3SCLPWMA5CTS3 – hardware flow control for Serial3
20input/outputTX5LRCLK1A6
21input/outputRX5BCLK1A7
22input/outputCTX1PWMA8
23input/outputCRX1PWMMCLK1A9
24input/outputTX6SCL2PWMA10
25input/outputRX6SDA2PWMA11
26input/outputMOSI1A12A12 on ADC2 only
27input/outputSCK1A13A13 on ADC2 only
28input/outputRX7PWM
29input/outputTX7PWM
30input/outputCRX3CAN3 – also supports CAN FD
31input/outputCTX3CAN3 – also supports CAN FD
32input/outputOUT1BI2S1 data output B (RX data 3 for multichannel inputs)
33input/outputPWMMCLK2
34input/outputRX8
35input/outputTX8
36input/outputCSPWMAdditional hardware CS for SPI
37input/outputCSPWMAdditional hardware CS for SPI
38input/outputA14A14 on ADC2 only; alternatively SPI1 CS and I2S1 IN1
39input/outputA15A15 on ADC2 only; alternatively SPI1 MISO and I2S1 OUT1A
40input/outputA16
41input/outputA17
GND–
3V3output3.3 V output from the regulator, max. 250 mA for external circuits. Teensy 4.1 pins are not 5V tolerant – do not apply more than 3.3 V to any pin except VIN and VUSB.
GND–
3V3output3.3 V output from the regulator, max. 250 mA for external circuits. Teensy 4.1 pins are not 5V tolerant – do not apply more than 3.3 V to any pin except VIN and VUSB.
GND–
VINinputPower 3.6–5.5 V. With USB connected, VIN is tied to VUSB – before powering from VIN, cut the VIN–VUSB jumper on the underside of the board.
VBATinput3 V backup cell for the RTC clock
3V3output3.3 V output from the regulator, max. 250 mA for external circuits. Teensy 4.1 pins are not 5V tolerant – do not apply more than 3.3 V to any pin except VIN and VUSB.
GND–
PROGRAMinputConnecting to GND enters download mode (same as the white button); it is not a reset. Holding for 13–17 s erases the flash and restores the Blink program.
ON/OFFinputButton to GND: holding for 4 s turns off the 3.3 V supply, a 0.5 s press turns it on. With a backup cell on VBAT, it remembers the state even without power.
5VoutputUSB Host – device power (protected)
D-input/outputUSB Host – D−
D+input/outputUSB Host – D+
GND–
GND–
TX+outputEthernet – transmit +
TX-outputEthernet – transmit −
RX+inputEthernet (DP83825I) – receive +, to magnetics/RJ45
RX-inputEthernet – receive −
LEDoutputEthernet – link LED (through 150 Ω)
GND–
42input/outputMISO2PWMKontakt slotu microSD (DAT1); SPI2 MISO
43input/outputMOSI2PWMmicroSD slot contact (DAT0); SPI2 MOSI, alternatively CTS5
44input/outputCS2PWMmicroSD slot contact (CLK); SPI2 CS, alternatively Wire1 SDA
45input/outputSCK2PWMmicroSD slot contact (CMD); SPI2 SCK, alternatively Wire1 SCL
46input/outputPWMmicroSD slot contact (DAT3); alternatively Serial5 RX
47input/outputPWMmicroSD slot contact (DAT2); alternatively Serial5 TX
VUSBoutput5 V z USB konektoru
48input/outputPad underneath (QSPI) – CS0 for PSRAM; alternatively Serial8 RX
49input/outputPad underneath (QSPI) – D1, shared by both memories; alternatively SPI2 SCK
50input/outputPad underneath (QSPI) – D2, shared; alternatively SPI2 MOSI
51input/outputPWMPad underneath (QSPI) – CS1 for additional flash
52input/outputPad underneath (QSPI) – D0, shared; alternatively Serial1 RX
53input/outputPad underneath (QSPI) – CLK, shared; alternatively Serial1 TX
54input/outputPWMPad underneath (QSPI) – D3, shared; alternatively SPI2 MISO
USB D-input/outputUSB (device) – D−, pad on the underside next to the connector
USB D+input/outputUSB (device) – D+, pad on the underside next to the connector

What to watch out for

  • Pins are not 5V tolerant – only VIN and VUSB can take more than 3.3 V.
  • VIN is connected to VUSB. Before powering from VIN with USB connected, cut the VIN–VUSB jumper on the bottom of the board.
  • Draw at most 250 mA from the 3.3V pins, and preferably no more than 4 mA from a single pin.
  • Pin 13 has an LED – INPUT_PULLUP doesn’t work on it.
  • The Program pin is not a reset: it enters upload mode, and holding it for 15 s erases the flash and restores the Blink program.

Teensy on chiptron.eu/

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