Description
The Kaltstahl USB dongle is a higher-capacity version of Blaustahl with USB-MSC firmware for drag-and-drop file support like any standard USB drive.
Kaltstahl also has improved ESD protection and a potentially increased operational lifetime due to storage of firmware in EEPROM instead of Flash. Kaltstahl comes in a durable translucent case.
Kaltstahl now ships with the Ebenstahl (USB-MSC) firmware for drag-and-drop file support; it also supports the original Blaustahl (USB-CDC) firmware.
Features
- USB-MSC interface requires no additional drivers on most OSes
- RP2040 MCU 32-bit MCU (Dual Cortex M0+, 264KB SRAM)
- 4MB (32Mbit) EEPROM for firmware storage
- Data retention: 100+ years
- 256KB (2Mbit) Ferroelectric RAM
- Data retention: 95 years @ +55C, over 200 years @ +35C
- Endurance: 10^12 read/write cycles @ +85C
- LED
- Supports FRAM write protection via solder jumper
- Improved ESD protection
- Includes 3D-printed translucent PLA plastic case (color/appearance may differ from photo)
- Board dimensions: 30mm x 16mm
Use Cases
- Password storage
- Cryptocurrency private key storage
- Note/list storage
- Geocaching
- Time capsules
- Data logging
- FRAM development board
Resources
- Schematics, firmware images, documentation and a 3D-printable case are available on GitHub
- USB-MSC firmware source is available on GitHub
- USB-CDC firmware source is available on GitHub
Future data recovery
In the event that the USB interface were to become obsolete or the RP2040 were to become non-functional, it should still be possible to recover the FRAM data using a SOP-8 test clip.
Origin
- Designed in Germany
- PCB manufactured and assembled in China
- PLA enclosure manufactured and assembled in Germany
- Tested, packaged and shipped from Germany
