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DS28EC20: 20Kb 1-Wire EEPROM
speed, the DS28EC20 requires V PUP to be 5V ±5%. Note that legacy 1-Wire products support a standard
communication speed of 16.3kbps and overdrive of 142kbps. The slightly reduced rates for the DS28EC20 are a
result of additional recovery times, which in turn were driven by a 1-Wire physical interface enhancement to
improve noise immunity. The value of the pullup resistor primarily depends on the network size and load conditions.
The DS28EC20 requires a pullup resistor of 2.2k ? (max) at any speed.
The idle state for the 1-Wire bus is high. If for any reason a transaction needs to be suspended, the bus MUST be
left in the idle state if the transaction is to resume. If this does not occur and the bus is left low for more than 16μs
(overdrive speed) or more than 120μs (standard speed), one or more devices on the bus can be reset.
Figure 8. Hardware Configuration
BUS MASTER
V PUP
R PUP
DS28EC20 1-Wire PORT
RX
DATA
RX
TX
Open-Drain
Port Pin
RX = RECEIVE
TX = TRANSMIT
I L
100 ?
MOSFET
TX
TRANSACTION SEQUENCE
The protocol for accessing the DS28EC20 through the 1-Wire port is as follows:
?
?
?
?
Initialization
ROM Function Command
Memory Function Command
Transaction/Data
INITIALIZATION
All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence consists of a
reset pulse transmitted by the bus master followed by presence pulse(s) transmitted by the slave(s). The presence
pulse lets the bus master know that the DS28EC20 is on the bus and is ready to operate. For more details, see the
1-Wire Signaling section.
1-Wire ROM FUNCTION COMMANDS
Once the bus master has detected a presence, it can issue one of the seven ROM function commands that the
DS28EC20 supports. All ROM function commands are 8 bits long. See Figure 9 for list of these commands.
READ ROM [33h]
This command allows the bus master to read the DS28EC20’s 8-bit family code, unique 48-bit serial number, and
8-bit CRC. This command can only be used if there is a single slave on the bus. If more than one slave is present
on the bus, a data collision occurs when all slaves try to transmit at the same time (open drain produces a wired-
AND result). The resultant family code and 48-bit serial number result in a mismatch of the CRC.
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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