DS24B33+ MAXIM [Maxim Integrated Products], DS24B33+ Datasheet - Page 7

• Manufacturer Part Number: DS24B33+
• Description: 4Kb 1-Wire EEPROM with 200k Write/Erase Cycles
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 4. 1-Wire CRC Generator
Figure 5. Memory Map
The shift register bits are initialized to 0. Then, starting
with the LSB of the family code, one bit at a time is
shifted in. After the 8th bit of the family code has been
entered, the serial number is entered. After the last bit
of the serial number has been entered, the shift register
contains the CRC value. Shifting in the 8 bits of the
CRC returns the shift register to all 0s.
X
0
0040h to 01DFh
0000h to 001Fh
0020h to 003Fh
01E0h to 01FFh
STAGE
ADDRESS
1ST
X
1
_______________________________________________________________________________________
STAGE
2ND
X
2
STAGE
3RD
X
32-BYTE INTERMEDIATE STORAGE SCRATCHPAD
3
STAGE
4TH
32-BYTE FINAL STORAGE EEPROM
32-BYTE FINAL STORAGE EEPROM
32-BYTE FINAL STORAGE EPPROM
POLYNOMIAL = X
FINAL STORAGE EEPROM
4Kb 1-Wire EEPROM with
X
4
8
200k Write/Erase Cycles
+ X
5
STAGE
The DS24B33 EEPROM array (Figure 5) consists of 16
pages of 32 bytes each, starting at address 0000h and
ending at address 01FFh. In addition to the EEPROM,
the device has a 32-byte volatile scratchpad. Writes to
the EEPROM array are a two-step process. First, data
is written to the scratchpad and then copied into the
main array. The user can verify the data in the scratch-
pad prior to copying.
5TH
+ X
4
+ 1
X
5
STAGE
6TH
X
6
STAGE
7TH
X
INPUT DATA
PAGES 2 to 14
7
PAGE 15
PAGE 0
PAGE 1
STAGE
8TH
Memory
X
8
7