Device Identification

The DSU - Device Service Unit peripheral provides the Device Selection bits in the Device Identification register (DID.DEVSEL) in order to identify the device by software. The SAM D21 variants have a reset value of DID=0x1001drxx, with the LSB identifying the die number ('d'), the die revision ('r') and the device selection ('xx').

Table 1. SAM D21 Device Identification Values
Device Variant	DID.DEVSEL	Device ID (DID)
SAMD21J18A	0x00	0x10010000
SAMD21J17A	0x01	0x10010001
SAMD21J16A	0x02	0x10010002
SAMD21J15A	0x03	0x10010003
Reserved	0x04
SAMD21G18A	0x05	0x10010005
SAMD21G17A	0x06	0x10010006
SAMD21G16A	0x07	0x10010007
SAMD21G15A	0x08	0x10010008
Reserved	0x09
SAMD21E18A	0x0A	0x1001000A
SAMD21E17A	0x0B	0x1001000B
SAMD21E16A	0x0C	0x1001000C
SAMD21E15A	0x0D	0x1001000D
Reserved	0x0E
SAMD21G18A (WLCSP)	0x0F	0x1001000F
SAMD21G17A (WLCSP)	0x10	0x10010010
Reserved	0x11 - 0x1F
SAMD21J16B	0x20	0x10011420
SAMD21J15B	0x21	0x10011421
Reserved	0x22
SAMD21G16B	0x23	0x10011423
SAMD21G15B	0x24	0x10011424
Reserved	0x25
SAMD21E16B	0x26	0x10011426
SAMD21E15B	0x27	0x10011427
Reserved	0x28-0x54
SAMD21E16B (WLCSP)	0x55	0x10011455
SAMD21E15B (WLCSP)	0x56	0x10011456
Reserved	0x57-0xFF

Note: The device variant (last letter of the ordering number) is independent of the die revision (DSU.DID.REVISION): The device variant denotes functional differences, whereas the die revision marks evolution of the die. The device variant denotes functional differences, whereas the die revision marks evolution of the die.