SparkFun

Teensy 4.0 Lockable Development Board

Name: Teensy 4.0 Lockable Development Board
Brand: SparkFun
SKU: SF-DEV-28368
Price: 39.77 AUD
Availability: OutOfStock

· MPN: DEV-28368

Teensy Microcontrollers & Development Boards

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This lockable Teensy 4.0 is a compact, very fast development board built around the NXP MIMXRT1062DVL6B ARM Cortex-M7 microcontroller. It runs at 600 MHz and...

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This lockable Teensy 4.0 is a compact, very fast development board built around the NXP MIMXRT1062DVL6B ARM Cortex-M7 microcontroller. It runs at 600 MHz and keeps the familiar Teensy footprint and breadboard-friendly layout, making it suitable for demanding embedded, audio, control and connected projects.

This version is intended for production and commercial applications where code protection matters. It provides write access to the chip’s eFuses so you can permanently lock the device into secure mode with your own encryption key; once locked, application code is encrypted, JTAG is disabled, and the microcontroller will only run code encrypted with your private key.

Please treat the locking process carefully: it is one-way and irreversible, and setting the fuses incorrectly can permanently brick the board. For development and prototyping, use the standard Teensy 4.0 before moving to this lockable version for final products.

The Teensyduino environment automatically places sketch code into fast tightly coupled memory, and supporting documentation includes quick start material, pin assignment charts, Teensyduino software information, and lockable Teensy code-security guidance.

Features:

Production-grade code security: Designed for developers moving from prototype to a final, secure product.
eFuse access: Allows the device to be locked into a secure mode permanently.
Encrypted application code: Helps prevent unauthorised reading, cloning or modification of intellectual property.
Secure mode: JTAG debug port is permanently disabled.
Private-key execution: The microcontroller will only run code encrypted with your private key.
Dual-Issue Superscalar Processor: Can execute two instructions per clock cycle at 600 MHz.
Branch Prediction: Learns loops and removes branch overhead so the branch instruction can run in a single clock cycle.
Hardware FPU: Provides hardware acceleration for both 64-bit "double" and 32-bit "float" types.
Tightly Coupled Memory: Enables very fast single-cycle access memory for the Cortex-M7.
Dynamic Clock Scaling: CPU speed can change on the fly without breaking serial baud rates, audio 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.
Cryptographic Acceleration: Included.
Random Number Generator: Included.
RTC for date/time: Included.
Programmable FlexIO: Included.
Pixel Processing Pipeline: Included.
Peripheral cross triggering: Included.
Power On/Off management: Included.

Specifications:

Processor: ARM Cortex-M7 at 600MHz
Microcontroller: NXP MIMXRT1062DVL6B
CPU speed: 600 MHz
RAM: 1MB (1,024KB)
RAM: 1024K RAM (512K is tightly coupled)
Flash memory: 2MB (2,048KB)
Flash memory: 2048K Flash (64K reserved for recovery & EEPROM emulation)
EEPROM emulation reserve: 64KB reserved for EEPROM emulation
Board size: 1.4 x 0.7 inches
Package: compact 144-pin package
TCM allocation: 512K of its 1024K total RAM
TCM buses: a pair of dual 64/32-bit high-speed buses
Typical current: approximately 100mA when running at 600 MHz
USB ports: 2 USB ports, both 480MBit/sec
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
I2C: 3 I2C, all with 4 byte FIFO
Serial: 7 Serial, all with 4 byte FIFO
DMA channels: 32 general purpose DMA channels
PWM pins: 31 PWM pins
Digital pins: 40 digital pins, all interrrupt capable
Analog pins: 14 analog pins, 2 ADCs on chip

A strong choice for experienced Teensy users finalising a secure product, especially where high-speed processing, audio, CAN, USB, SPI, I2C or real-time control are required.

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.
I2C: I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
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.
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.