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参数资料
| 型号： | DS1621S |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
| 封装： | 0.150 INCH, SO-8 |
| 文件页数： | 13/16页 |
| 文件大小： | 647K |
| 代理商： | DS1621S |
DS1621
6 of 16
102299
THF
= Temperature High Flag. This bit will be set to “1” when the temperature is greater than or
equal to the value of TH. It will remain “1” until reset by writing “0” into this location or removing power
from the device. This feature provides a method of determining if the DS1621 has ever been subjected to
temperatures above TH while power has been applied.
TLF
= Temperature Low Flag. This bit will be set to “1” when the temperature is less than or equal
to the value of TL. It will remain “1” until reset by writing “0” into this location or removing power from
the device. This feature provides a method of determining if the DS1621 has ever been subjected to
temperatures below TL while power has been applied.
NVB
= Nonvolatile Memory Busy flag. “1” = Write to an E
2 memory cell in progress, “0” =
nonvolatile memory is not busy. A copy to E
2 may take up to 10 ms.
POL
= Output Polarity Bit. “1” = active high, “0” = active low. This bit is nonvolatile.
1SHOT = One Shot Mode. If 1SHOT is “1”, the DS1621 will perform one temperature conversion upon
receipt of the Start Convert T protocol.
If 1SHOT is “0”, the DS1621 will continuously perform
temperature conversions. This bit is nonvolatile.
For typical thermostat operation the DS1621 will operate in continuous mode. However, for applications
where only one reading is needed at certain times or to conserve power, the one–shot mode may be used.
Note that the thermostat output (TOUT) will remain in the state it was in after the last valid temperature
conversion cycle when operating in one–shot mode.
2–WIRE SERIAL DATA BUS
The DS1621 supports a bidirectional 2–wire bus and data transmission protocol. A device that sends data
onto the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls
the message is called a “master." The devices that are controlled by the master are “slaves." The bus must
be controlled by a master device which generates the serial clock (SCL), controls the bus access, and
generates the START and STOP conditions. The DS1621 operates as a slave on the 2–wire bus.
Connections to the bus are made via the open–drain I/O lines SDA and SCL.
The following bus protocol has been defined (See Figure 4):
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in
the data line while the clock line is high will be interpreted as control signals.
Accordingly, the following bus conditions have been defined:
Bus not busy: Both data and clock lines remain HIGH.
Start data transfer: A change in the state of the data line, from HIGH to LOW, while the clock is HIGH,
defines a START condition.
Stop data transfer: A change in the state of the data line, from LOW to HIGH, while the clock line is
HIGH, defines the STOP condition.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1621S/T&R | 制造商:Maxim Integrated Products 功能描述:DIGITAL THERMOMETER & THERMOSTAT - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC |
| DS1621S/T&R+W | 制造商:Maxim Integrated Products 功能描述:2-WIRE INTER-TEMPSENS 8PSO LF T&R W - Tape and Reel |
| DS1621S/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 |
| DS1621S/T&R+W | 功能描述:板上安装温度传感器 Digital Thermometer & Thermostat 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 |
| DS1621S+ | 功能描述:板上安装温度传感器 Digital Thermometer & Thermostat 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 |
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