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| Part Number | 3900 |
| Datasheet | 3900 datasheet |
| Description | HALLOWING M0 EXPRESS ATSAMD21G18 |
| Manufacturer | Adafruit Industries LLC |
| Series | SAM D |
| Part Status | Active |
| Board Type | Evaluation Platform |
| Type | MCU 32-Bit |
| Core Processor | ARM® Cortex®-M0+ |
| Operating System | - |
| Platform | HalloWing M0 Express |
| For Use With/Related Products | ATSAMD21G18 |
| Mounting Type | Fixed |
| Contents | Board(s), LCD |