Feather-Format Double M33 Express Packs NXP's Dual-Core LPC55S69 and Its Twin USB Interfaces

Upcoming open-hardware board is designed to "bring more USB functionality to the Feather ecosystem."

Washington-based Steiert Solutions is preparing to launch a crowdfunding campaign for the Double M33 Express, a USB-focused Feather-format development board built around NXP's LPC55S69 dual-core Arm Cortex-M33 microcontroller.

"This open hardware board is designed to bring more USB functionality to the Feather ecosystem by taking advantage of both USB interfaces of the LPC55S69," Steiert explains of the design. "Its high-speed interface is associated with the USB Micro-B connector, which serves as the board’s primary interface, while its full-speed interface is wired up to a USB Type-A socket footprint, on the back of the board, that can be used to attach peripherals. Both ports are device/host capable, but you may need to adapt the connectors. The LPC55S69 has plenty of internal SRAM and a second core to help it keep up with higher data rates."

"We designed Double M33 Express to make life easier for anyone who's project relies on the many capabilities of the USB standard. Since a USB host needs to provide power, we included a switching charger with reverse-boost capability. As a result, Double M33 Express can not only charge large batteries more quickly, it can generate 5V for USB peripherals even when disconnected from a power source."

The board is based on an NXP LPC55S69 with two Arm Cortex-M33 cores running at 150MHz, 320kB of static RAM (SRAM), 640kB of internal flash plus 8MB of SPI flash, and a High Speed USB Micro-B connector with device and host capabilities along with a Full Speed USB Type-A connector. A microSD card slot offers expandable storage, while there are two on-board NeoPixel RGB LEDs and a Qwiic/STEMMA QT-compatible I2C connector for external hardware in addition to the Feather-format GPIO headers.

Steiert has confirmed plans to release full design files for the Double M33 Express following the closure of the crowdfunding campaign. To be notified when the campaign goes live, sign up on Crowd Supply now.

Gareth Halfacree
Freelance journalist, technical author, hacker, tinkerer, erstwhile sysadmin. For hire: freelance@halfacree.co.uk.
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