DS2431 데이터 시트보기 (PDF) - Maxim Integrated

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DS2431

1024-Bit, 1-Wire EEPROM

Maxim Integrated 

TSOC

3, 4, 5, 6

2

1

—

TO-92

3

2

1

PIN

TDFN-EP

1, 4, 5, 6

2

3

—

EP

1024-Bit, 1-Wire EEPROM

Pin Description

SFN

—

1

2

—

UCSPR

A2, A3, C2,

C3

C1

A1

—

NAME

FUNCTION

N.C.

IO

GND

EP

Not Connected

1-Wire Bus Interface. Open-drain signal

that requires an external pullup resistor.

Ground Reference

Exposed Pad. Solder evenly to the

board’s ground plane for proper

operation. Refer to Application Note

3273: Exposed Pads: A Brief

Introduction for additional information.

Detailed Description

The DS2431 combines 1024 bits of EEPROM, an

8-byte register/control page with up to 7 user read/write

bytes, and a fully featured 1-Wire interface in a single

chip. Each DS2431 has its own 64-bit ROM registration

number that is factory lasered into the chip to provide a

guaranteed unique identity for absolute traceability.

Data is transferred serially through the

1-Wire protocol, which requires only a single data lead

and a ground return. The DS2431 has an additional

memory area called the scratchpad that acts as a

buffer when writing to the main memory or the register

page. Data is first written to the scratchpad from which

it can be read back. After the data has been verified, a

Copy Scratchpad command transfers the data to its

final memory location. The DS2431 applications include

accessory/PCB identification, medical sensor calibra-

tion data storage, analog sensor calibration including

IEEE P1451.4 smart sensors, ink and toner print car-

tridge identification, and after-market management of

consumables.

Overview

The block diagram in Figure 1 shows the relationships

between the major control and memory sections of the

DS2431. The DS2431 has four main data components:

64-bit lasered ROM, 64-bit scratchpad, four 32-byte

pages of EEPROM, and a 64-bit register page.

IO

1-Wire

FUNCTION CONTROL

MEMORY

FUNCTION

CONTROL UNIT

CRC-16

GENERATOR

DATA MEMORY

4 PAGES OF

256 BITS EACH

REGISTER PAGE

64 BITS

Figure 1. Block Diagram

PARASITE POWER

64-BIT

LASERED ROM

DS2431

64-BIT

SCRATCHPAD

_______________________________________________________________________________________ 5

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