DS2704 Maxim Integrated Products, DS2704 Datasheet - Page 15

• Manufacturer Part Number: DS2704
• Description: 1280-Bit EEPROM
• Manufacturer: Maxim Integrated Products

Table 7. All Function Commands
Write Challenge
Compute MAC
without ROM ID and
return MAC
Compute MAC
with ROM ID and
return MAC
Clear Secret
Compute Next Secret
without ROM ID
Compute Next Secret
with ROM ID
Lock Secret
Read Memory
Read Data/Generate
CRC
Read All
Read Status
Write Status
Write Scratchpad
Read Scratchpad
Copy Scratchpad
Set Overdrive
Clear Overdrive
Reset
Key: CC¾complete compatibility, NP:¾no programming pulse required on DS2704.
COMMAND
HEX
0C
C3
AA
6C
8D
BB
5A
6A
F0
8B
36
35
30
33
65
55
69
48
Writes 64-bit challenge for SHA-1
processing. Required prior to all Compute
MAC and Compute Next Secret commands.
Computes hash of the message block with all
1’s in place of the ROM ID
Computes hash of the message block using
the ROM ID
Clears the 64-bit Secret to 0000 0000 0000
0000h.
Generates new global secret.
Generates new unique secret.
Sets lock bit to prevent changes to the
Secret.
Read data from 1024-bit EEPROM Memory
data field
Read data from 1024-bit EEPROM Memory
data field and generate a CRC value of the
data read during the operation
Read data from the all 5 pages of the
EEPROM Memory data field
Read data from the 8-byte EEPROM Status
data field
Write data to the EEPROM Status data field.
Write data to the 8-byte Scratchpad buffer
Read data from the 8-byte Scratchpad buffer
Write Scratchpad data to EEPROM data
field.
Sets 1-Wire interface timings to
OVERDRIVE.
Sets 1-Wire interface timings to STANDARD.
(Factory Default)
Resets DS2704 (Software POR)
15 of 18
FUNCTION
DS2502
COMPATIBILITY
CC
CC
CC
NP
DS2703
CC
CC
CC
CC
NP
NP
NP
NP
NP