Interface
The interface chip handles the USB connection, and is used for flashing new code to the micro:bit, sending and receiving serial data back and forth to your main computer.
Due to parts availability, two variants of the V2.2X devices exist, each using a different interface chip. A limited number of devices were built using the nRF52833-QDAA, while subsequent devices use the nRF52820-QDAA. As both chips belong to the same family, the same DAPLink firmware image runs on both variants, providing identical functionality.
Specifications
| Item | details | |
|---|---|---|
| Model | nRF52833-QDAA | nRF52820-QDAA |
| Core variant | 64 MHz Arm® Cortex®-M4F | 64 MHz Arm® Cortex®-M4 |
| Flash ROM | 512KB (128kB use for firmware, 128kB reserved for non-volatile storage, rest unused) | 256KB (128kB reserved for non-volatile storage) |
| RAM | 128KB (only 32 KB used) | 32KB |
| Speed | 64MHz | 64MHz |
| Debug capabilities | SWD | SWD |
| More Info | DAPLink, nRF52833 datasheet | DAPLink, nRF52820 datasheet |