MicroMod Teensy Processor Hookup Guide

Contributors: El Duderino
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Hardware Overview

We'll cover the hardware and components included on the MicroMod Teensy Processor Board in this section and highlight some of their unique features.

M.2 Connector

All of our MicroMod Processor come equipped with the M.2 MicroMod Connector, which leverages the M.2 standard and specification to allow you to install your MicroMod Processor on your choice of Carrier Board.

M.2 Connector from the Front M.2 Connector from the Back

The M.2 MicroMod connector is keyed (in tandem with the set screw notch) to prevent the Processor from being inserted and secured improperly.

NXP iMXRT1062 Processor

The brain of the MicroMod Teensy Processor is the NXP iMXRT1062 from NXP Semiconductors. This Arm Cortex-M7 core processor is one of the most powerful microprocessors available today. The MicroMod Teensy Processor board takes advantage of the following properties:

  • ARM Cortex-M7 at 600MHz
  • Seven Serial Ports
  • 2 SPI ports (One dedicated SPI available by default on most Carrier Boards[1]. Dedicated Hardware SDIO for SD.)
  • 4 I2C Bus (One I2C bus available by default on most Carrier Boards[1])
  • USB Host Capability up to 480Mbit/sec making it capable of interfacing with USB flash drives, mice, keyboards and more.
  • USB Device Capability up to 480Mbit/sec making it capable of interfacing with USB keyboard/mouse/joystick, MIDI, audio and more.
  • 1 CAN Bus Interface
  • I2S Digital Audio and S/PDIF
  • 12 Dedicated GPIO
  • 14 Analog pins (2 dedicated, 10 share signals.)
  • 3.3V-tolerant I/O pins
  • 16MB Flash Memory (256K reserved for recover & EEPROM emulation)
  • 1024K RAM Memory (512K is tightly coupled)

Photo of the Teensy Processor highlighting NXP iMXRT1062 IC.

Note: We recommend advanced users looking to take full advantage of all of the features of the Teensy Processor use it with the MicroMod ATP (All the Pins) Carrier Board or their own custom Carrier Board. Many of the pins with extra functionality may be tied to a specific use on other Carrier Boards and therefore essentially unavailable for things like extra UARTs, SPI/I2C or Analog In/PWM.

Flash IC

The MicroMod Teensy Processor uses the W25Q128JV-DTR serial flash memory IC from Windbond Electronics. The flash IC features 128mb of memory. For a detailed overview of the IC, refer to the datasheet.

Photo of the Teensy Processor highlighting the W25Q128JV-DTR Flash IC.


There are two LEDs on the Teensy Processor. The PROG LED indicates when the HalfKay bootloader is enabled and the programming IC is powered. We'll cover how to enter the bootloader in the Software Setup and Arduino Example sections. The STAT LED is tied to SCK/13 and can be used as a status LED or as a built-in LED. Control it directly by writing to LED_BUILTIN.

Photo highlighting the LEDs

Measure Jumper

The Measure (MEAS) Jumper can be opened to measure how much current the Teensy Processor is pulling from V_USB. It's is CLOSED by default and ties the USB_VBUS pins to V_USB. Open it by severing the trace and then using a digital multimeter to measure the current draw.

Photo highlighting the MEAS Jumper

Teensy Processor Pin Functions

The Teensy Processor is similar to the Teensy 4.0 and 4.1 with a few notable differences. In order to maintain easy interoperability with MicroMod Carrier Boards, not all of the alternate pin functions are defined for the MicroMod Teensy board variant but we have done our best to make the Teensy Processor as versatile as possible with the right Carrier Board. The sections below outline the various signal protocols available on the MicroMod Teensy.


As you may have guessed from our extensive Qwiic System, we love communicating with devices using I2C! The Teensy Processor features four I2C buses. The main I2C bus has dedicated pins connected to MiroMod pads 12 (SDA) and 14 (SCL) (Teensy pins 18 and 19), along with a dedicated interrupt pin connected to MicroMod pad 16 (Teensy pin 29). The primary I2C Bus will almost always be connected to a Qwiic connector on your Carrier Board.

If you need a second I2C bus, the Teensy has SDA1 and SCL1 on MicroMod pads 53 and 51 (Teensy pins 25 and 24). To use this second bus, initialize it by calling Wire1.begin();.


The Teensy Processor is capable of having seven UARTs available. The primary UART is tied to USB_D± (MicroMod pads 3 and 5) for serial communication over USB. This is used for your standard serial upload as well as serial prints in Arduino. The secondary UART is a hardware UART tied to MicroMod pads 19 (RX1) and 17 (TX1) (Teensy pins 0 and 1). The tertiary UART is another hardware UART tied to MicroMod pads 20 (RX2) and 22 (TX2) (Teensy pins 17 and 16). In Arduino, the three UARTs are called as listed below:

  • Serial - Communication over USB
  • Serial1 - Communication over RX1/TX1
  • Serial2 - Communication over RX2/TX2


You may not recognize the COPI/CIPO labels for SPI pins. SparkFun is working to move away from using MISO/MOSI to describe signals between the controller and the peripheral. Check out this page for more on our reasoning behind this change.

The Teensy Processor has two SPI ports. The primary SPI connects to the following pins:

  • SDI/CIPO - Serial data input (Controller In/Peripheral Out). MicroMod pad 61. Teensy pin 12.
  • SDO/COPI - Serial data output (Controller Out/Peripheral In). MicroMod pad 59. Teensy pin 11.
  • SCK - SPI Clock. MicroMod pad 57. Teensy pin 13.
  • CS - Chip select. MicroMod pad 55. Teensy pin 10.

Due to hardware limitations on most MicroMod Carrier Boards, SPI1 is only available for hardware SDIO communication with an SD card. Use the ATP Carrier to directly interact with SPI1.


One of the unique features of the Teensy is its ability to communicate with CAN devices. The Teensy MicroMod can receive CAN messages but in order to send them properly you will need a separate CAN transceiver. CAN-RX is tied to MicroMod pad 41 (Teensy pin 30) and CAN-TX is tied to MicroMod pad 43 (Teensy pin 31).


The Teensy Processor supports audio using the I2S standard. The pins used are:

  • AUD_OUT - GPIO pin 7, pad 56 on the MicroMod, this is the digital audio output.
  • AUD_IN - GPIO pin 8, pad 54 on the MicroMod, this is the digital audio input.
  • AUD_LRCLK - GPIO pin 20, pad 52 on the MicroMod. Officially called "word select", and also known as "frame sync".
  • AUD_BCLK - GPIO pin 21, pad 50 on the MicroMod. Offically called "continuous serial clock, and also known as the "bit clock"


The MicroMod Teensy has all 12 general purpose IO pins available on top of 6 dedicated pins for digital, analog and PWM signals. The dedicated pins are just that, and are not shared with any other pin, unlike the general purpose pins which may be shared with other pins. Take note that not all GPIO pins are broken out or in use on every carrier board. Refer to your Carrier Board's Hookup Guide for more information on pin use.

Dedicated Pins
  • A0 - Teensy pin 14, MicroMod pad 34
  • A1 - Teensy pin 15, MicroMod pad 38
  • D0 - Teensy pin 4, MicroMod pad 10
  • D1 - Teensy pin 5, MicroMod pad 18
  • PWM0 - Teensy pin 3, MicroMod pad 32
  • PWM1 - Teensy pin 2, MicroMod pad 47
General Purpose IO pins
  • G0 - Teensy pin 40, MicroMod pad 40
  • G1 - Teensy pin 41, MicroMod pad 42
  • G2 - Teensy pin 42, MicroMod pad 44
  • G3 - Teensy pin 43, MicroMod pad 46
  • G4 - Teensy pin 44, MicroMod pad 48
  • G5 - Teensy pin 45, MicroMod pad 73
  • G6 - Teensy pin 6, MicroMod pad 71
  • G7 - Teensy pin 9, MicroMod pad 69
  • G8 - Teensy pin 26, MicroMod pad 67
  • G9 - Teensy pin 32, MicroMod pad 65
  • G10 - Teensy pin 33, MicroMod pad 63
  • G11 - Teensy pin 27, MicroMod pad 8
Extra Teensy Functionality

As experienced users may know, the pins on Teensy development boards are very versatile and can be used for a multitude of purposes. As we noted above, in order to maintain compatibility with the rest of the MicroMod system, not all of these alternate functions are available on the MicroMod Teensy but some pins can be configured for things like Analog Inputs or Pulse Width Modulation. As mentioned before, the best way to interact with these pins is with the ATP Carrier Board.

The list below shows all 14 pins on the Teensy Processor available for use as Analog Inputs.

  • A0 - Teensy pin 14, dedicated on MM pad 34. PWM-Capable.
  • A1 - Teensy pin 15, dedicated on MM pad 38. PWM-Capable.
  • A2 - Teensy pin 16, shared with RX2 (MM pad 20). Input Only.
  • A3 - Teensy pin 17, shared with TX2 (MM pad 22). Input Only.
  • A4 - Teensy pin 18, shared with I2C_SDA (MM pad 12). PWM-Capable.
  • A5 - Teensy pin 19, shared with I2C_SCL (MM pad 14). PWM-Capable.
  • A6 - Teensy pin 20, shared with AUD_LRCLK (MM pad 52). Input Only.
  • A7 - Teensy pin 21, shared with AUD_BCLK (MM pad 50). Input Only.
  • A8 - Teensy pin 22, shared with BATT_VIN/3 (MM pad 49). Input Only.
  • A9 - Teensy pin 23, shared with AUD_MCLK (MM pad 58). PWM-Capable.
  • A10 - Teensy pin 24, shared with I2C_SCL1 (MM pad 53). PWM-Capable.
  • A11 - Teensy pin 25, shared with I2C_SDA1 (MM pad 51). PWM-Capable.
  • A12 - Teensy pin 26, shared with G8 (MM pad 67). Input Only.
  • A13 - Teensy pin 27, shared with G11 (MM pad 8). Input Only.

The default MicroMod Teensy Processor board definition is limited to these extra functionalities along with a few other pins that can technically be used for PWM signals when not in use for other signal protocols. Keep reading to the next section, MicroMod Pinout, for specific information on these pins.

MicroMod Pinout

Refer to the datasheet and user manual for a full overview of the iMXRT1062's capabilities. The complete pin map can be found in the table below or you can refer to the schematic. PJRC has a wealth of knowledge on their forums with regard to the beta testing of the MicroMod Teensy. Here is a specific post that goes into detail about the pin map.

Heads up! The pin table below and schematic both include the Teensy pin associated with each MicroMod pin and this correlation can be used to identify alternate uses for pins on the Teensy Processor but not all of the alternate Teensy functionalities are available for use with the SparkFun Teensy MicroMod board definition. For many of the General Purpose I/O pins and other pins with multiple signal options, refer to your Carrier Board's Hookup Guide for information on how those pins are configured what they are used for. Not all pins are used on every Carrier Board.
Teensy Pin Alternate Function Primary Function Bottom
Primary Function Alternate Function Teensy Pin
(Not Connected) 75 GND
3.3V 74 73 G5 45
RTC_3V_BATT 72 71 G6 PWM 6
38 SDIO_DATA3 70 69 G7 PWM 9
39 SDIO_DATA2 68 67 G8 A12 (Input only) 26
34 SDIO_DATA1 66 65 G9 32
35 SDIO_DATA0 64 63 G10 PWM 33
8 PWM AUD_IN 54 53 I2C_SCL1 A10 (PWM) 24
20 A6 (Input Only) AUD_LRCLK 52 51 I2C_SDA1 A11 (PWM) 25
21 A7 (Input Only) AUD_BCLK 50 49 BATT_VIN / 3 (0 to 3.3V) A8 (Input Only) 22
44 G4 48 47 PWM1 2
43 G3 46 45 GND
42 G2 44 43 CAN_TX 31
41 G1 42 41 CAN_RX 30
40 G0 40 39 GND
15 PWM A1 38 37 USBHOST_D- USB2_D-
14 PWM A0 34 33 GND
3 PWM0 32 31 Module Key
Module Key 30 29 Module Key
Module Key 28 27 Module Key
Module Key 26 25 Module Key
Module Key 24 23 Not Connected
17 A3 (Input Only) UART_TX2 22 21 Not Connected
16 A3 (Input Only) UART_RX2 20 19 UART_RX1 0
5 PWM D1 18 17 UART_TX1 PWM 1
29 PWM I2C_INT 16 15 Not Connected
19 A5 (PWM) I2C_SCL 14 13 Not Connected
18 A4 (PWM) I2C_SDA 12 11 BOOT (Open Drain) PROG
27 A13 (Input Only) G11 8 7 GND
ON/OFF RESET# (Open Drain) 6 5 USB_D- USB_D-
28 3.3V_EN 4 3 USB_D+ USB_D+
3.3V 2 1 GND
Function Bottom
(Not Connected) 75 GND
3.3V 74 73 G5 / BUS5
RTC_3V_BATT 72 71 G6 / BUS6
SPI_CS1# SDIO_DATA3 (I/O) 70 69 G7 / BUS7
SDIO_DATA2 (I/O) 68 67 G8
PDM_CLK PCM_CLK I2S_SCK AUD_BCLK 50 49 BATT_VIN / 3 (I - ADC) (0 to 3.3V)
G4 / BUS4 48 47 PWM1
G3 / BUS3 46 45 GND
G2 / BUS2 44 43 CAN_TX
G1 / BUS1 42 41 CAN_RX
G0 / BUS0 40 39 GND
A1 38 37 USBHOST_D-
A0 34 33 GND
PWM0 32 31 Module Key
Module Key 30 29 Module Key
Module Key 28 27 Module Key
Module Key 26 25 Module Key
Module Key 24 23 SWDIO
UART_TX2 (O) 22 21 SWDCK
UART_RX2 (I) 20 19 UART_RX1 (I)
CAM_TRIG D1 18 17 UART_TX1 (0)
I2C_INT# 16 15 UART_CTS1 (I)
I2C_SCL (I/0) 14 13 UART_RTS1 (O)
I2C_SDA (I/0) 12 11 BOOT (I - Open Drain)
D0 10 9 USB_VIN
SWO G11 8 7 GND
RESET# (I - Open Drain) 6 5 USB_D-
3.3V_EN 4 3 USB_D+
3.3V 2 1 GND
Signal Group Signal I/O Description Voltage
Power 3.3V I 3.3V Source 3.3V
GND Return current path 0V
USB_VIN I USB VIN compliant to USB 2.0 specification. Connect to pins on processor board that require 5V for USB functionality 4.8-5.2V
RTC_3V_BATT I 3V provided by external coin cell or mini battery. Max draw=100μA. Connect to pins maintaining an RTC during power loss. Can be left NC. 3V
3.3V_EN O Controls the carrier board's main voltage regulator. Voltage above 1V will enable 3.3V power path. 3.3V
BATT_VIN/3 I Carrier board raw voltage over 3. 1/3 resistor divider is implemented on carrier board. Amplify the analog signal as needed for full 0-3.3V range 3.3V
Reset Reset I Input to processor. Open drain with pullup on processor board. Pulling low resets processor. 3.3V
Boot I Input to processor. Open drain with pullup on processor board. Pulling low puts processor into special boot mode. Can be left NC. 3.3V
USB USB_D± I/O USB Data ±. Differential serial data interface compliant to USB 2.0 specification. If UART is required for programming, USB± must be routed to a USB-to-serial conversion IC on the processor board.
USB Host USBHOST_D± I/O For processors that support USB Host Mode. USB Data±. Differential serial data interface compliant to USB 2.0 specification. Can be left NC.
CAN CAN_RX I CAN Bus receive data. 3.3V
CAN_TX O CAN Bus transmit data. 3.3V
UART UART_RX1 I UART receive data. 3.3V
UART_TX1 O UART transmit data. 3.3V
UART_RTS1 O UART request to send. 3.3V
UART_CTS1 I UART clear to send. 3.3V
UART_RX2 I 2nd UART receive data. 3.3V
UART_TX2 O 2nd UART transmit data. 3.3V
I2C I2C_SCL I/O I2C clock. Open drain with pullup on carrier board. 3.3V
I2C_SDA I/O I2C data. Open drain with pullup on carrier board 3.3V
I2C_INT# I Interrupt notification from carrier board to processor. Open drain with pullup on carrier board. Active LOW 3.3V
I2C_SCL1 I/O 2nd I2C clock. Open drain with pullup on carrier board. 3.3V
I2C_SDA1 I/O 2nd I2C data. Open drain with pullup on carrier board. 3.3V
SPI SPI_COPI O SPI Controller Output/Peripheral Input. 3.3V
SPI_CIPO I SPI Controller Input/Peripheral Output. 3.3V
SPI_SCK O SPI Clock. 3.3V
SPI_CS# O SPI Chip Select. Active LOW. Can be routed to GPIO if hardware CS is unused. 3.3V
SPI/SDIO SPI_SCK1/SDIO_CLK O 2nd SPI Clock. Secondary use is SDIO Clock. 3.3V
SPI_COPI1/SDIO_CMD I/O 2nd SPI Controller Output/Peripheral Input. Secondary use is SDIO command interface. 3.3V
SPI_CIPO1/SDIO_DATA0 I/O 2nd SPI Peripheral Input/Controller Output. Secondary use is SDIO data exchange bit 0. 3.3V
SDIO_DATA1 I/O SDIO data exchange bit 1. 3.3V
SDIO_DATA2 I/O SDIO data exchange bit 2. 3.3V
SPI_CS1/SDIO_DATA3 I/O 2nd SPI Chip Select. Secondary use is SDIO data exchange bit 3. 3.3V
Audio AUD_MCLK O Audio master clock. 3.3V
AUD_OUT/PCM_OUT/I2S_OUT/CAM_MCLK O Audio data output. PCM synchronous data output. I2S serial data out. Camera master clock. 3.3V
AUD_IN/PCM_IN/I2S_IN/CAM_PCLK I Audio data input. PCM syncrhonous data input. I2S serial data in. Camera periphperal clock. 3.3V
AUD_LRCLK/PCM_SYNC/I2S_WS/PDM_DATA I/O Audio left/right clock. PCM syncrhonous data SYNC. I2S word select. PDM data. 3.3V
AUD_BCLK/PCM_CLK/I2S_CLK/PDM_CLK O Audio bit clock. PCM clock. I2S continuous serial clock. PDM clock. 3.3V
SWD SWDIO I/O Serial Wire Debug I/O. Connect if processor board supports SWD. Can be left NC. 3.3V
SWDCK I Serial Wire Debug clock. Connect if processor board supports SWD. Can be left NC. 3.3V
ADC A0 I Analog to digital converter 0. Amplify the analog signal as needed to enable full 0-3.3V range. 3.3V
A1 I Analog to digital converter 1. Amplify the analog signal as needed to enable full 0-3.3V range. 3.3V
PWM PWM0 O Pulse width modulated output 0. 3.3V
PWM1 O Pulse width modulated output 1. 3.3V
Digital D0 I/O General digital input/output pin. 3.3V
D1/CAM_TRIG I/O General digital input/output pin. Camera trigger. 3.3V
General/Bus G0/BUS0 I/O General purpose pins. Any unused processor pins should be assigned to Gx with ADC + PWM capable pins given priority (0, 1, 2, etc.) positions. The intent is to guarantee PWM, ADC and Digital Pin functionality on respective ADC/PWM/Digital pins. Gx pins do not guarantee ADC/PWM function. Alternative use is pins can support a fast read/write 8-bit or 4-bit wide bus. 3.3V
G1/BUS1 I/O 3.3V
G2/BUS2 I/O 3.3V
G3/BUS3 I/O 3.3V
G4/BUS4 I/O 3.3V
G5/BUS5 I/O 3.3V
G6/BUS6 I/O 3.3V
G7/BUS7 I/O 3.3V
G8 I/O General purpose pin 3.3V
G9/ADC_D-/CAM_HSYNC I/O Differential ADC input if available. Camera horizontal sync. 3.3V
G10/ADC_D+/CAM_VSYNC I/O Differential ADC input if available. Camera vertical sync. 3.3V
G11/SWO I/O General purpose pin. Serial Wire Output 3.3V

Note: There was a minor error in the schematic and Eagle file when the board was originally released. Pins 38 and 39 were labeled as:

SD_B0_04 -> 38/DAT2
SD_B0_05 -> 39/DAT3
Functionally, the pins are routed correctly. You may not have noticed this because the SDIO pins do not have to be manually defined. When manually defining the pins as digital I/O in Arduino, make sure to define the pins as listed in the table or the pins labeled below.

SD_B0_04 -> 39/DAT2
SD_B0_05 -> 38/DAT3

Board Dimensions

MicroMod Processors all measure in at 22mm x 22mm, with 15mm to the top notch and 12mm to the E key. For more information regarding the processor board physical standards, head on over to the Getting Started with MicroMod and Designing With MicroMod tutorials.

Teensy Processor Board Dimensions

The overall thickness of the MicroMod Teensy Processor Board is ~3.10mm. The height of the tallest component (NXP iMXRT1062 labeled as "U1" in the board file) on the Processor side is ~1.28mm. The PCB thickness is ~0.80mm. The height of the tallest component (transistor labeled as "Q1" in the board file) is about ~1.02mm.