DS2431/T datasheet, PDF - EEWORLD Datasheet

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DS2431/T: Description1K X 1 1-WIRE SERIAL EEPROM, PBCY3; Categorystorage; File Size164KB，23 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS2431/T Overview

1K X 1 1-WIRE SERIAL EEPROM, PBCY3

DS2431/T Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	3
Maximum operating temperature	85 Cel
Minimum operating temperature	-40 Cel
Maximum supply/operating voltage	5.25 V
Minimum supply/operating voltage	2.8 V
Rated supply voltage	3.3 V
Processing package description	TO-92, 3 PIN
state	DISCONTINUED
packaging shape	Rectangle
Package Size	cylindrical
Terminal form	THROUGH-hole
terminal coating	tin lead
Terminal location	BOTTOM
Packaging Materials	Plastic/Epoxy
Temperature level	INDUSTRIAL
memory width	1
organize	1K × 1
storage density	1024 deg
operating mode	ASYNCHRONOUS
Number of digits	1024 words
Number of digits	1K
Memory IC type	1-wire serial electrically erasable read-only memory
serial parallel	serial

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DS2431

1024-Bit 1-Wire EEPROM

www.maxim-ic.com

GENERAL DESCRIPTION

The DS2431 is a 1024-bit, 1-Wire EEPROM chip

organized as four memory pages of 256 bits each.

Data is written to an 8-byte scratchpad, verified, and

then copied to the EEPROM memory. As a special

feature, the four memory pages can individually be

write protected or put in EPROM-emulation mode,

where bits can only be changed from a 1 to a 0 state.

The DS2431 communicates over the single-

conductor 1-Wire bus. The communication follows

the standard Dallas Semiconductor 1-Wire protocol.

Each device has its own unalterable and unique 64-

bit ROM registration number that is factory lasered

into the chip. The registration number is used to

address the device in a multidrop 1-Wire net

environment.

FEATURES

1024 Bits of EEPROM Memory Partitioned into

Four Pages of 256 Bits

Individual Memory Pages can be Permanently

Write Protected or Put in EPROM-Emulation

Mode ("Write to 0")

Switchpoint Hysteresis and Filtering to Optimize

Performance in the Presence of Noise

IEC 1000-4-2 Level 4 ESD Protection (8kV

Contact, 15kV Air)

Reads and Writes Over a Wide Voltage Range of

2.8V to 5.25V from -40°C to +85°C

Communicates to Host with a Single Digital

Signal at 15.4kbps or 111kbps Using 1-Wire

Protocol

APPLICATIONS

Accessory/PC Board Identification

Medical Sensor Calibration Data Storage

Analog Sensor Calibration Including IEEE-

P1451.4 Smart Sensors

Ink and Toner Print Cartridge Identification

After-Market Management of Consumables

ORDERING INFORMATION

PART

DS2431

DS2431/T&R

DS2431P

DS2431P/T&R

DS2431X

TEMP RANGE

-40°C to 85°C

PIN-PACKAGE

TO-92

TO-92, tape & reel

TSOC

TSOC, tape & reel

CSP, tape & reel

TYPICAL OPERATING CIRCUIT

PUP

PIN CONFIGURATION

TO-92

TSOC, Top View

µC

I/O

DS2431

GND

TSOC, TO-92 pinout:

Pin 1 -------------

GND

Pin 2 -------------

I/O

All other pins --

A1 = NC

A2 = I/O

B1 = NC

B2 = GND

Commands, Registers, and Modes are capitalized for

clarity.

1-Wire is a registered trademark of Dallas Semiconductor Corp.

CSP, approx. 68

68 mil

Top view, bumps not visible

Note:

Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here:

www.maxim-ic.com/errata.

1 of 23

REV: 050704

DS2431: 1024-Bit, 1-Wire EEPROM

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 via 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

verified, a copy scratchpad command transfers the data to its final memory location. Applications of the DS2431

include accessory/PC board identification, medical sensor calibration data storage, analog sensor calibration

including IEEE-P1451.4 Smart Sensors, ink and toner print cartridge 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: 1) 64-bit lasered ROM, 2) 64-bit scratchpad, 3) four 32-byte

pages of EEPROM, and 4) 64-bit register page. The hierarchical structure of the 1-Wire protocol is shown in Figure

2. The bus master must first provide one of the seven ROM Function Commands, 1) Read ROM, 2) Match ROM, 3)

Search ROM, 4) Skip ROM, 5) Resume, 6) Overdrive-Skip ROM or 7) Overdrive-Match ROM. Upon completion of

an Overdrive ROM command byte executed at standard speed, the device enters Overdrive mode where all

subsequent communication occurs at a higher speed. The protocol required for these ROM function commands is

described in Figure 9. After a ROM function command is successfully executed, the memory functions become

accessible and the master may provide any one of the four memory function commands. The protocol for these

memory function commands is described in Figure 7.

All data is read and written least significant bit first.

Figure 1. Block Diagram

PARASITE POWER

I/O

1-Wire

Function Control

64-bit

Lasered ROM

Memory

Function

Control Unit

DS2431

CRC16

Generator

64-bit

Scratchpad

Data Memory

4 Pages of

256 bits each

64 bits

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DS2431/T Related Products

	DS2431/T	DS2431	DS2431/T&R	DS2431P	DS2431P/T&R	DS2431X	DS2431/R	DS2431P/R
Description	1K X 1 1-WIRE SERIAL EEPROM, PBCY3	1K X 1 1-WIRE SERIAL EEPROM, PBCY3	1K X 1 1-WIRE SERIAL EEPROM, PBCY3	1K X 1 1-WIRE SERIAL EEPROM, PDSO6	1K X 1 1-WIRE SERIAL EEPROM, PBCY3	The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each	1K X 1 1-WIRE SERIAL EEPROM, PBCY3	1K X 1 1-WIRE SERIAL EEPROM, PBCY3
Number of functions	1	-	1	-	1	-	1	1
Number of terminals	3	-	3	-	3	-	3	3
Maximum operating temperature	85 Cel	-	85 Cel	-	85 Cel	-	85 Cel	85 Cel
Minimum operating temperature	-40 Cel	-	-40 Cel	-	-40 Cel	-	-40 Cel	-40 Cel
Maximum supply/operating voltage	5.25 V	-	5.25 V	-	5.25 V	-	5.25 V	5.25 V
Minimum supply/operating voltage	2.8 V	-	2.8 V	-	2.8 V	-	2.8 V	2.8 V
Rated supply voltage	3.3 V	-	3.3 V	-	3.3 V	-	3.3 V	3.3 V
Processing package description	TO-92, 3 PIN	-	TO-92, 3 PIN	-	TO-92, 3 PIN	-	TO-92, 3 PIN	TO-92, 3 PIN
state	DISCONTINUED	-	DISCONTINUED	-	DISCONTINUED	-	DISCONTINUED	DISCONTINUED
packaging shape	Rectangle	-	Rectangle	-	Rectangle	-	Rectangle	Rectangle
Package Size	cylindrical	-	cylindrical	-	cylindrical	-	cylindrical	cylindrical
Terminal form	THROUGH-hole	-	THROUGH-hole	-	THROUGH-hole	-	THROUGH-hole	THROUGH-hole
terminal coating	tin lead	-	tin lead	-	tin lead	-	tin lead	tin lead
Terminal location	BOTTOM	-	BOTTOM	-	BOTTOM	-	BOTTOM	BOTTOM
Packaging Materials	Plastic/Epoxy	-	Plastic/Epoxy	-	Plastic/Epoxy	-	Plastic/Epoxy	Plastic/Epoxy
Temperature level	INDUSTRIAL	-	INDUSTRIAL	-	INDUSTRIAL	-	INDUSTRIAL	INDUSTRIAL
memory width	1	-	1	-	1	-	1	1
organize	1K × 1	-	1K × 1	-	1K × 1	-	1K × 1	1K × 1
storage density	1024 deg	-	1024 deg	-	1024 deg	-	1024 deg	1024 deg
operating mode	ASYNCHRONOUS	-	ASYNCHRONOUS	-	ASYNCHRONOUS	-	ASYNCHRONOUS	ASYNCHRONOUS
Number of digits	1K	-	1K	-	1K	-	1K	1K
Memory IC type	1-wire serial electrically erasable read-only memory	-	1-wire serial electrically erasable read-only memory	-	1-wire serial electrically erasable read-only memory	-	1-wire serial electrically erasable read-only memory	1-wire serial electrically erasable read-only memory
serial parallel	serial	-	serial	-	serial	-	serial	serial

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