- 您现在的位置：买卖IC网 > PDF目录381720 > DS1623 (DALLAS SEMICONDUCTOR) High Resolution Temperature Measurementwith Dallas Direct-to -digital Temperature Sensors(数字温度计) PDF资料下载
参数资料
| 型号： | DS1623 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | High Resolution Temperature Measurementwith Dallas Direct-to -digital Temperature Sensors(数字温度计) |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
| 文件页数： | 1/19页 |
| 文件大小： | 67K |
| 代理商： | DS1623 |
ACopyright 1995 by Dallas Semiconductor Corporation.
Application Note 105
High Resolution Temperature Measurement
with Dallas Direct–to–Digital
Temperature Sensors
APPLICATION NOTE 105
SLOPE ACCUMULATOR
COUNTER
COMPARE
TEMPERATURE REGISTER
PRESET
=0
COUNTER
=0
PRESET
LOW TEMPERATURE
COEFFICIENT OSCILLATOR
HIGH TEMPERATURE
COEFFICIENT OSCILLATOR
INC
SET/CLEAR
LSB
STOP
032796 1/19
INTRODUCTION
This application note describes the principle of opera-
tion of Dallas Semiconductor’s line of direct–to–digital
temperature sensors, and outlines a method of achiev-
ing high (<0.05
°
C) resolution with these devices. An
example C code listing is given for use with the DS1620.
DIRECT–TO–DIGITAL TEMPERATURE
SENSOR PRINCIPLE OF OPERATION
The Dallas Direct–to–Digital Temperature Sensors
measure temperature through the use of an onboard
proprietary temperature measurement technique. A
block diagram of the temperature measurement cir-
cuitry is shown in Figure 1.
Each temperature sensor measures temperature by
counting the number of clock cycles that an oscillator
with a low temperature coefficient goes through during a
gate period determined by a high temperature coeffi-
cient oscillator. The counter is preset with a base count
that corresponds to –55
°
C. If the counter reaches zero
before the gate period is over, the temperature register,
which is also preset to the –55
°
C value, is incremented,
indicating that the temperature is higher than –55
°
C.
At the same time, the counter is then preset with a value
determined by the slope accumulator circuitry. This cir-
cuitry is needed to compensate for the parabolic behav-
ior of the oscillators over temperature. The counter is
then clocked again until it reaches zero. If the gate
period is still not finished, then this process repeats.
The slope accumulator is used to compensate for the
nonlinear behavior of the oscillators over temperature,
yielding a high resolution temperature measurement
(0.5
°
C for almost all the products). This is done by
changing the number of counts necessary for the
counter to go through for each incremental degree in
temperature. To obtain the desired resolution, there-
fore, both the value of the counter and the number of
counts per degree C (the value of the slope accumula-
tor) at a given temperature must be known.
TEMPERATURE MEASUREMENT CIRCUITRY
Figure 1
相关PDF资料 |
PDF描述 |
|---|---|
| DS1624 | Digital Thermometer and Memory(数字温度计和存储器) |
| DS1625 | Digital Thermometer and Thermostat(数字温度计和恒温控制器) |
| DS1629 | 2-Wire Digital Thermometer and Real Time Clock(2线数字温度计和实时时钟) |
| DS1631S | High-Precision Digital Thermometer and Thermostat |
| DS1632 | PC Power Fail and Reset Controller(PC电源故障和复位控制器) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1624 | 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 |
| DS1624+ | 功能描述:板上安装温度传感器 Digital Thermometer & Memory 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 |
| DS1624S | 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 |
| DS1624S/T&R | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR W/MEMORY 8P SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM/EEPROM DIG 256BYT 8SOIC |
| DS1624S/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 |
发布紧急采购，3分钟左右您将得到回复。