DS1961S-F3 Maxim Integrated Products, DS1961S-F3 Datasheet - Page 5

• Manufacturer Part Number: DS1961S-F3
• Description: IBUTTON EEPROM 1KBit SHA-1 2CAN
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1961S-F3

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 128B
• Memory Type: EEPROM
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 4. 1-WIRE CRC GENERATOR
MEMORY MAP
The DS1961S has four memory areas: data memory, secrets memory, register page with special function
registers and user-bytes, and a scratchpad. The data memory is organized in pages of 32 bytes. Secret,
register page, and scratchpad are 8 bytes each. The scratchpad acts as a buffer when writing to the data
memory, loading the initial secret or when writing to the register page.
Data memory, secrets memory, and the register page are located in a linear address space, as shown in
Figure 5. The data memory and the register page have unrestricted read access. Writing to the data
memory and the register page requires knowledge of the secret.
Figure 5. DS1961S MEMORY MAP
1)
will neither write-protect the address nor activate any function.
ADDRESS RANGE
Once programmed to AAh or 55h this address becomes read-only. All other codes can be stored but
X
008Eh to 008Fh
0000h to 001Fh
0020h to 003Fh
0040h to 005Fh
0060h to 007Fh
0080h to 0087h
0090h to 0097h
0
STAGE
1st
008Ch
008Dh
008Ah
0088h
0089h
008Bh
X
1
1)
1)
1)
1)
1)
STAGE
2nd
X
2
STAGE
Write-Protect Secret, 008Ch to 008Fh
3rd
User Byte/Write-Protect Page 0 Only
User Byte/EPROM Mode Control for
User Bytes/Manufacturer ID
X
Write-Protect Pages 0 to 3
User Byte, Self-Protecting
Factory Byte (Read Only)
3
64-Bit Identity Register
STAGE
Data Memory Page 0
Data Memory Page 1
Data Memory Page 2
Data Memory Page 3
4th
Secrets Memory
DESCRIPTION
Polynomial = X
Page 1
5 of 36
X
8
4
+ X
STAGE
5th
5
+ X
4
+ 1
Protection Activated by Code AAh or 55h
Protection Activated by Code AAh or 55h
Protection Activated by Code AAh or 55h
Protection Activated by Code AAh or 55h
No Read Access; No Secret Needed for
Mode Activated by Code AAh or 55h
Reads Either AAh or 55h; See Text
Function Depends on Factory Byte
No Write-Access Without Secret
No Write-Access Without Secret
No Write-Access Without Secret
No Write-Access Without Secret
X
5
STAGE
Read-Only Access
6th
Write Access
INPUT DATA
X
NOTE
6
STAGE
7th
X
7
STAGE
8th
X
8