SparkFun

Teensy 4.1 Lockable Microcontroller Board

Name: Teensy 4.1 Lockable Microcontroller Board
Brand: SparkFun
SKU: SF-DEV-28369
Price: 52.63 AUD
Availability: InStock

· MPN: DEV-28369

Teensy Microcontrollers & Development Boards

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This lockable Teensy 4.1 is aimed at advanced developers moving from prototype to a secure production design. It keeps the high-performance 600 MHz ARM Corte...

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This lockable Teensy 4.1 is aimed at advanced developers moving from prototype to a secure production design. It keeps the high-performance 600 MHz ARM Cortex-M7 platform of the Teensy 4.1 while adding write access to the chip’s eFuses so your final application can be encrypted and locked to the device.

The board uses the larger Teensy 3.6-style form factor and breaks out a much wider set of I/O than the smaller Teensy 4.0. It adds useful built-in connectivity and storage options including a 10/100 Mbit Ethernet PHY, microSD card socket and USB host port, making it suitable for connected controllers, data loggers and demanding embedded projects.

Teensyduino automatically places sketch code into fast tightly coupled memory, helping the Cortex-M7 keep up with numerically intensive applications. The board also provides bottom-side locations for optional external memory, so larger projects can be expanded with PSRAM or QSPI flash when required.

Important: locking this board is a one-way, irreversible process intended for advanced users finalising a product. Setting the fuses incorrectly can permanently brick the device. For development and prototyping, use a standard Teensy 4.0 or Teensy 4.1.

Features:

Production-grade code security: provides write access to the chip’s eFuses for permanent secure mode.
Encrypted applications: once locked, the microcontroller will only run code encrypted with your private key.
JTAG lockout: in secure mode, the JTAG debug port is permanently disabled.
Dual-Issue Superscalar Processor: can execute two instructions per clock cycle at 600 MHz.
Branch Prediction: branch prediction can remove loop overhead and allow the branch instruction to run in a single clock cycle.
Hardware FPU: provides hardware acceleration for both 64-bit “double” and 32-bit “float” types.
Expandable memory: two bottom-side locations allow optional soldering of external memory.
Dynamic Clock Scaling: changing CPU speed on the fly will not break serial baud rates, audio streaming sample rates, delay() or millis().
Power On/Off: a dedicated On/Off pin can completely disable the 3.3V power supply.
RTC Support: the Real-Time Clock can keep date and time when a coin cell is connected to VBAT.
Overclocking: capable of being overclocked well beyond 600 MHz.

Specifications:

Processor: ARM Cortex-M7 at 600MHz
RAM: 1024K RAM (512K is tightly coupled)
Flash: 8 Mbyte Flash (64K reserved for recovery & EEPROM emulation)
USB: USB Host Port
Program memory: 2 chips Plus Program Memory
Total I/O pins: 55 Total I/O Pins
CAN bus: 3 CAN Bus (1 with CAN FD)
I2S digital audio: 2 I2S Digital Audio
S/PDIF digital audio: 1 S/PDIF Digital Audio
SDIO: 1 SDIO (4 bit) native SD
SPI: 3 SPI, all with 16 word FIFO
Bottom SMT pad signals: 7 Bottom SMT Pad Signals
Serial ports: 8 Serial ports
DMA channels: 32 general purpose DMA channels
PWM pins: 35 PWM pins
Breadboard friendly I/O: 42 Breadboard Friendly I/O
Analogue inputs: 18 analog inputs
Cryptography: Cryptographic Acceleration
Random number generator: Random Number Generator
RTC: RTC for date/time
FlexIO: Programmable FlexIO
Pixel processing: Pixel Processing Pipeline
Peripheral triggering: Peripheral cross triggering
Ethernet PHY: 10 / 100 Mbit DP83825 PHY (6 pins)
Storage socket: microSD Card Socket
Power management: Power On/Off management
Main processor: NXP MIMXRT1062DVJ6B
Processor package: 196-pin package
Onboard flash memory: 8MB of Flash memory
Onboard RAM: 1MB (1024K) of RAM
Form factor: 2.4in x 0.7in
TCM allocation: 512K of its 1024K total RAM
TCM buses: dual 64/32-bit high-speed buses
External memory expansion: up to 16MB of PSRAM or a QSPI flash chip
Current consumption: approximately 100mA when running at 600 MHz
Power-down control: hold a pushbutton for five seconds to power down; a brief press turns it back on.

Best suited to secure, high-performance embedded products that need plenty of I/O, Ethernet, SD storage, audio, serial and real-time control capability.

Jargon buster

Plain-language definitions for the technical terms used above.

baud: Baud is the signalling rate of a serial connection, often used as the speed setting for UART communication. Matching the baud rate matters because both connected devices must use the same setting for readable data.
CAN bus: CAN bus is a reliable two-wire communication network originally designed for vehicles and now common in machinery and robotics. It matters when you need multiple controllers or devices to share status and control messages in a noisy electrical environment.
EEPROM: A type of non-volatile memory that keeps stored data even when power is turned off. In a sensor module, it can be used to store settings or calibration data so they do not need to be re-entered every time.
FIFO: FIFO stands for “first in, first out” and is a small memory buffer inside the sensor that stores recent readings in order. This matters because it can help capture motion data without the microcontroller needing to read the sensor every single instant.
Flash memory: Non-volatile memory that keeps stored data even when power is removed. In this sensor, it matters because enrolled fingerprint templates can remain saved after the project is turned off.
FPU: A floating-point unit is hardware inside a processor that speeds up calculations with decimal numbers. This helps when projects use maths-heavy tasks such as motion sensing, filtering sensor readings, or audio processing.
I2S: I2S is a digital audio interface used to send sound data between chips, such as from a microcontroller to an audio amplifier or DAC. It matters if your project needs cleaner digital audio output than a basic buzzer or PWM signal can provide.
JTAG: JTAG is a hardware debugging and programming interface used to inspect and control chips at a low level. It matters for advanced development because it can help diagnose firmware problems that are hard to see through normal serial output.
microcontroller: A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
microSD card: A microSD card is a small removable memory card used to store files such as audio tracks. For this product, the card is where the sound files live, so its capacity and formatting can affect how many sounds you can use.
PWM: Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
RAM: RAM is temporary memory used while a device is running, and its contents are lost when power is removed. A “Run in RAM” mode is useful for testing settings without permanently programming the module, but it may not support every feature.
RTC: A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
SPI: A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
USB host: A USB host is the side of a USB connection that controls attached devices, like a computer talking to a keyboard or flash drive. This matters because most microcontroller boards are normally USB devices, so adding USB host support lets them use common USB peripherals.