The content of the Signature Row fuses (SIGROW) is pre-programmed and read-only. SIGROW contains information such as device ID, serial number, and calibration values.
All the AVR32DB28/32/48 devices have a three-byte device ID that identifies the device. The device ID can be read using the Unified Program and Debug Interface (UPDI), also when a device is locked. The device ID for the AVR32DB28/32/48 devices consists of three signature bytes, which is given by the following table.
| Device Name | Signature Byte Address and Value | ||
|---|---|---|---|
| 0x00 | 0x01 | 0x02 | |
| AVR32DB28 | 0x1E | 0x95 | 0x37 |
| AVR32DB32 | 0x1E | 0x95 | 0x36 |
| AVR32DB48 | 0x1E | 0x95 | 0x35 |