DS24B33 Просмотр технического описания (PDF) - Maxim Integrated

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DS24B33

4Kb 1-Wire EEPROM with 200k Write/Erase Cycles

Maxim Integrated 

TO-92

1

2

3

SO

4

3

1, 2, 5–8

4Kb 1-Wire EEPROM with

200k Write/Erase Cycles

NAME

GND

IO

N.C.

Pin Description

FUNCTION

Ground Reference

1-Wire Bus Interface. Open-drain pin that requires external pullup resistor.

Not Connected

Detailed Description

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

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.

Overview

Figure 1 shows the relationships between the major

control and memory sections of the DS24B33. The

DS24B33 has four main data components: 64-bit

PARASITE POWER

1-Wire NET

1-Wire FUNCTION

CONTROL

64-BIT REGISTRATION

NUMBER

DS24B33

MEMORY

FUNCTION

CONTROL UNIT

CRC-16

GENERATOR

DATA MEMORY

16 PAGES OF

32 BYTES EACH

32-BYTE

SCRATCHPAD

Figure 1. Block Diagram

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