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DS24B33
1-Wire 4Kb EEPROM
Read Memory [F0h]
The Read Memory command is the general function to
read from the DS24B33. After issuing the command,
the master must provide a 2-byte target address, which
should be in the range of 0000h to 01FFh. If the target
address is higher than 01FFh, the DS24B33 changes
the upper 7 address bits to 0. After the address is
transmitted, the master reads data starting at the (modi-
fied) target address and can continue until address
01FFh. If the master continues reading, the result is
FFh. The Read Memory command can be ended at any
point by issuing a reset pulse. Note that the (modified)
target address provided with the Read Memory com-
mand overwrites the target address that was specified
with a previously issued Write Scratchpad command.
The Read Memory command overwrites the scratchpad
with data from the target memory page. When reading
the last byte of a memory page, the scratchpad is
loaded with data from the next memory page. This
could cause unexpected data to be loaded into the
scratchpad.
V PUP
BUS MASTER
R PUP
1-Wire Bus System
The 1-Wire bus is a system that has a single bus master
and one or more slaves. In all instances the DS24B33 is
a slave device. The bus master is typically a microcon-
troller. The discussion of this bus system is broken
down into three topics: hardware configuration, trans-
action sequence, and 1-Wire signaling (signal types
and timing). The 1-Wire protocol defines bus transac-
tions in terms of the bus state during specific time slots,
which are initiated on the falling edge of sync pulses
from the bus master.
Hardware Configuration
The 1-Wire bus has only a single line by definition; it is
important that each device on the bus be able to drive
it at the appropriate time. To facilitate this, each device
attached to the 1-Wire bus must have open-drain or
three-state outputs. The 1-Wire port of the DS24B33 is
open drain with an internal circuit equivalent to that
shown in Figure 8.
DS24B33 1-Wire PORT
Rx
DATA
Rx
Tx
Rx = RECEIVE
I L
Tx
Tx = TRANSMIT
Figure 8. Hardware Configuration
12
OPEN-DRAIN
PORT PIN
100 ? MOSFET
Maxim Integrated
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相关代理商/技术参数
DS24B33G+U 功能描述:电可擦除可编程只读存储器 1-WIRE 4KB 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
DS24B33Q+T&R 制造商:Maxim Integrated Products 功能描述:1-WIRE 4KB EEPROM - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC EEPROM 4KBIT 6TDFN 制造商:Maxim Integrated Products 功能描述:EEPROM 1-Wire 4kbit EEPROM
DS24B33Q+T&R 功能描述:电可擦除可编程只读存储器 1-Wire 4kbit 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
DS24B33Q+U 功能描述:电可擦除可编程只读存储器 1-WIRE 4KB 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
DS24B33S 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33S R 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33S T 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33S TR 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM