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参数资料
| 型号： | DS1821S |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | 0.208 INCH, SOIC-8 |
| 文件页数： | 16/17页 |
| 文件大小： | 461K |
| 代理商： | DS1821S |
DS1821
Page 8 of 17
1-WIRE BUS SYSTEM
The 1-wire bus system uses a single bus master (i.e., a microprocessor) to control slave devices. The
DS1821 functions as a slave device when it is used in 1-wire mode; however, since the DS1821 is not
addressable or multi-droppable, a single 1-wire-mode DS1821 must be the only slave device on the bus.
All data and commands are transmitted least significant bit first over the 1-wire bus.
The following discussion of the 1-wire bus system is broken down into three topics: hardware
configuration, transaction sequence, and 1-wire signaling (signal types and timing).
HARDWARE CONFIGURATION
The 1-wire bus has by definition only a single data line. Each device (in this case, the master and one
DS1821) interfaces to the data line via an open drain or 3–state port. This allows each device to “release”
the data line when the device is not transmitting data so that the bus is available for use by the other
device. The 1-wire port of the DS1821 (the DQ pin) is open drain with an internal circuit equivalent to
that shown in Figure 6.
The 1-wire bus requires an external pullup resistor of approximately 5 k
; thus, 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. Infinite recovery time can occur between bits so long as the 1-wire
bus is in the inactive (high) state during the recovery period. If the bus is held low for more than 480
s,
the DS1821 will be reset.
HARDWARE CONFIGURATION Figure 6
TRANSACTION SEQUENCE
The transaction sequence for accessing the DS1821 via the 1-wire port is as follows:
Initialization
DS1821 Function Command
Data Transmitted/Received
5 A
Typ.
RX
TX
DS1821 1-WIRE PORT
100
MOSFET
TX
RX
RX = RECEIVE
TX = TRANSMIT
VDD
4.7K
1-wire bus
DQ
Pin
Micro-
processor
相关PDF资料 |
PDF描述 |
|---|---|
| DS1821 | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, ROUND, SURFACE MOUNT |
| DS1821T | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822-PAR+T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822-PAR/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822-PAR | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.20Cel, ROUND, THROUGH HOLE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1821S/T&R | 制造商:Maxim Integrated Products 功能描述:PROGRAM THERMOSTAT 208ML 8-SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT PROG 8-SOIC |
| DS1821S/T&R | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| DS1821S/TR | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Programmable Digital Thermostat and Thermometer |
| DS1821S+ | 功能描述:板上安装温度传感器 Programmable Digital Thermostat/Thrmmtr RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| DS1821S+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable Digital Thermostat and Thermometer |
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