Datasheet

DS28EC20: 20Kb 1-Wire EEPROM
9 of 27
Figure 5. Memory Map
ADDRESS RANGE TYPE DESCRIPTION PROTECTION CODES (NOTES)
0000h to 00FFh R/(W)
Data Memory
Pages 0 to 7 (Block 0)
(Protection controlled by address 0A00h)
0100h to 01FFh R/(W)
Data Memory
Pages 8 to 15 (Block 1)
(Protection controlled by address 0A01h)
0200h to 02FFh R/(W)
Data Memory
Pages 16 to 23 (Block 2)
(Protection controlled by address 0A02h)
0300h to 03FFh R/(W)
Data Memory
Pages 24 to 31 (Block 3)
(Protection controlled by address 0A03h)
0400h to 04FFh R/(W)
Data Memory
Pages 32 to 39 (Block 4)
(Protection controlled by address 0A04h)
0500h to 05FFh R/(W)
Data Memory
Pages 40 to 47 (Block 5)
(Protection controlled by address 0A05h)
0600h to 06FFh R/(W)
Data Memory
Pages 48 to 55 (Block 6)
(Protection controlled by address 0A06h)
0700h to 07FFh R/(W)
Data Memory
Pages 56 to 63 (Block 7)
(Protection controlled by address 0A07h)
0800h to 08FFh R/(W)
Data Memory
Pages 64 to 71 (Block 8)
(Protection controlled by address 0A08h)
0900h to 09FFh R/(W)
Data Memory
Pages 72 to 79 (Block 9)
(Protection controlled by address 0A09h)
0A00h* to 0A09h* R/(W)
Protection Control
Blocks 0 to 9
55h: Write protected; AAh: EPROM mode.
Address 0A00h is associated with Block 0,
address 0A01h with Block 1, etc.
0A0Ah to 0A1Dh R/(W) User EEPROM (Protection controlled by address 0A1Fh)
0A1Eh* R/(W) Memory Block Lock (See text)
0A1Fh* R/(W) Register Page Lock (See text)
0A20h R Factory Byte
(55h  no valid manufacturer ID, AAh 
0A23h to 0A24h are a valid Manufacturer ID)
0A21h to 0A22h R Factory Trim Bytes (Unspecified value)
0A23h to 0A24h R Manufacturer ID Validity depends on factory byte
0A25h to 0A3Fh R Reserved (Unspecified value)
* Once programmed to AAh or 55h this address becomes read-only. All other codes can be stored but neither write-protect the address nor
activate any function.