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参数资料
| 型号： | DS1822 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| 封装： | TO92-3 |
| 文件页数： | 7/21页 |
| 文件大小： | 222K |
| 代理商： | DS1822 |
DS1822
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1-WIRE SIGNALING
The DS1822 uses a strict 1-Wire communication protocol to insure data integrity. Several signal types are
defined by this protocol: reset pulse, presence pulse, write 0, write 1, read 0, and read 1. All of these
signals, with the exception of the presence pulse, are initiated by the bus master.
INITIALIZATION PROCEDURE: RESET AND PRESENCE PULSES
All communication with the DS1822 begins with an initialization sequence that consists of a reset pulse
from the master followed by a presence pulse from the DS1822. This is illustrated in Figure 13. When the
DS1822 sends the presence pulse in response to the reset, it is indicating to the master that it is on the bus
and ready to operate.
During the initialization sequence the bus master transmits (TX) the reset pulse by pulling the 1-Wire bus
low for a minimum of 480
μs. The bus master then releases the bus and goes into receive mode (R
X).
When the bus is released, the 5k pullup resistor pulls the 1-Wire bus high. When the DS1822 detects this
rising edge, it waits 15
μs to 60μs and then transmits a presence pulse by pulling the 1-Wire bus low for
60
μs to 240μs.
INITIALIZATION TIMING Figure 13
READ/WRITE TIME SLOTS
The bus master writes data to the DS1822 during write time slots and reads data from the DS1822 during
read time slots. One bit of data is transmitted over the 1-Wire bus per time slot.
WRITE TIME SLOTS
There are two types of write time slots: “Write 1” time slots and “Write 0” time slots. The bus master
uses a Write 1 time slot to write a logic 1 to the DS1822 and a Write 0 time slot to write a logic 0 to the
DS1822. All write time slots must be a minimum of 60
μs in duration with a minimum of a 1μs recovery
time between individual write slots. Both types of write time slots are initiated by the master pulling the
1-Wire bus low (see Figure 14).
To generate a Write 1 time slot, after pulling the 1-Wire bus low, the bus master must release the 1-Wire
bus within 15
μs. When the bus is released, the 5k pullup resistor will pull the bus high. To generate a
Write 0 time slot, after pulling the 1-Wire bus low, the bus master must continue to hold the bus low for
the duration of the time slot (at least 60
μs).
LINE TYPE LEGEND
Bus master pulling low
DS1822 pulling low
Resistor pullup
VPU
GND
1-WIRE BUS
480
μs minimum
480
μs minimum
DS1822 TX
presence pulse
60-240
μs
MASTER TX RESET PULSE
MASTER RX
DS1822
waits 15-60
μs
相关PDF资料 |
PDF描述 |
|---|---|
| DS1822+T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822Z | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| DS18B20-PAR/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT |
| DS18B20-PAR | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT |
| DS18B20P | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1822/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 |
| DS1822+ | 功能描述:板上安装温度传感器 1-Wire Digital Thermometer 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 |
| DS1822+PAR | 功能描述:板上安装温度传感器 1-Wire Digital Thermometer 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 |
| DS1822+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Econo 1-Wire Digital Thermometer |
| DS1822+T&R | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE 3PIN TO-92 - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER ECONO DIG TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors 1-Wire Digital Thermometer |
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