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DS28EC20: 20Kb 1-Wire EEPROM
PIN DESCRIPTION
NAME
I/O
GND
N.C.
FUNCTION
1-Wire Bus Interface. Open drain, requires external pullup resistor.
Ground Reference
Not Connected
DESCRIPTION
The DS28EC20 combines 20Kb of data EEPROM with a fully featured 1-Wire interface in a single chip. The
memory is organized as 80 pages of 256 bits each. In addition, the device has one page for control functions such
as permanent write protection and EPROM-Emulation mode for individual 2048-bit (8-page) memory blocks. 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 scratchpad, from which it can be read back for verification before
transferring it to the EEPROM. The operation of the DS28EC20 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 DS28EC20
is derived entirely from the 1-Wire communication line. Each DS28EC20 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 environment. Multiple DS28EC20 devices can reside on a common 1-Wire bus and be
operated independently of each other. Applications of the DS28EC20 include device authentication, analog-sensor
calibration such as IEEE-P1451.4 Smart Sensors TEDS, ink and toner print cartridge identification, medical-sensor
calibration data storage, PC board identification, and data for self-configuration of central office switches, wireless
base stations, PBXs, or other modular-based rack systems. The DS28EC20 provides a high degree of backward
compatibility with the DS2433. Besides the different family codes, the only protocol change that is required on an
existing DS2433 implementation is a lengthening of the programming duration (t PROG ) from 5ms to 10ms.
Figure 1. Block Diagram
DS28EC20
I/O
1-Wire
Function Control
Parasite Power
Memory
Function
Control Unit
CRC16
Generator
Data Memory
80 Pages of
32 Bytes each
Special Function
Registers
6 of 27
64-Bit
Registration #
32-Byte
Scratchpad
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相关代理商/技术参数
DS28EC20-224-BB+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
DS28EC20P 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:DS28EC20_1203
DS28EC20P T 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:DS28EC20_1203
DS28EC20P+ 功能描述:电可擦除可编程只读存储器 20Kb 1-Wire 电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS28EC20P+T 功能描述:电可擦除可编程只读存储器 20Kb 1-Wire 电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS28EC20P-224-BB+T 制造商:Maxim Integrated Products 功能描述:- Tape and Reel
DS28EC20Q-A5A-5A+T 制造商:Maxim Integrated Products 功能描述:20KB 1-WIRE EEPROM - Tape and Reel
DS28EC20Q-A5A-5A+W 制造商:Maxim Integrated Products 功能描述:20KB 1-WIRE EEPROM - Rail/Tube