DS24B33 Maxim, DS24B33 Datasheet - Page 5

• Manufacturer Part Number: DS24B33
• Description: The DS24B33 is a 4096-bit, 1-Wire® EEPROM organized as 16 memory pages of 256 bits each
• Manufacturer: Maxim

The DS24B33 combines 4Kb of data EEPROM with a
fully featured 1-Wire interface in a single chip. The
memory is organized as 16 pages of 256 bits each. A
volatile 256-bit memory page called the scratchpad
acts as a buffer when writing data to the EEPROM to
ensure data integrity. Data is first written to the scratch-
pad, from which it can be read back for verification
before transferring it to the EEPROM. The operation of
the DS24B33 is controlled over the single-conductor
1-Wire bus. Device communication follows the standard
1-Wire protocol. The energy required to read and write
the DS24B33 is derived entirely from the 1-Wire com-
munication line. Each DS24B33 has its own unalterable
Figure 1. Block Diagram
TO-92
1
2
3
1, 2, 5–8
SO
4
3
_______________________________________________________________________________________
Detailed Description
NAME
GND
N.C.
DS24B33
IO
1-Wire NET
Ground Reference
1-Wire Bus Interface. Open-drain pin that requires external pullup resistor.
Not Connected
1-Wire FUNCTION
DATA MEMORY
32 BYTES EACH
CONTROL UNIT
16 PAGES OF
GENERATOR
FUNCTION
CONTROL
MEMORY
CRC-16
PARASITE POWER
and unique 64-bit registration number. The registration
number guarantees unique identification and is used to
address the device in a multidrop 1-Wire net environ-
ment. Multiple DS24B33 devices can reside on a com-
mon 1-Wire bus and be operated independently of
each other. Applications of the DS24B33 include cali-
bration data storage, PCB identification, and storage of
product revision status. The DS24B33 provides a high
degree of backward compatibility with the DS2433,
including having the same family code.
Figure 1 shows the relationships between the major
control and memory sections of the DS24B33. The
DS24B33 has four main data components: 64-bit
1-Wire 4Kb EEPROM
FUNCTION
64-BIT REGISTRATION
SCRATCHPAD
NUMBER
32-BYTE
Pin Description
Overview
5