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DS1720
ORDER INFORMATION
ORDERING
NUMBER
DS1720S+
DS1720S+T&R
PACKAGE
MARKING
DS1720 (see note)
DS1720 (see note)
DESCRIPTION
DS1720 in Lead-Free 208mil 8-pin SO
DS1720 in Lead-Free 208mil 8-pin SO, 2500 Piece
Tape-and-Reel
DS1720S DS1720 DS1720 in 208mil 8-pin SO
DS1720S/T&R DS1720 DS1720 in 208mil 8-pin SO, 2500 Piece Tape-and-Reel
Note: A “+” symbol will also be marked on the package near the Pin 1 indicator.
OPERATION–MEASURING TEMPERATURE
A block diagram of the DS1720 is shown in Figure 1. The DS1720 measures temperatures through the
use of an on–board proprietary temperature measurement technique. A block diagram of the temperature
measurement circuitry is shown in Figure 2.
The DS1720 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 coefficient
oscillator. The counter is preset with a base count that corresponds to –5 5° C. If the counter reaches zero
before the gate period is over, the temperature register, which is also preset to the –5 5° C value, is
incremented, indicating that the temperature is higher than –5 5° C. At the same time, the counter is then
preset with a value determined by the slope accumulator circuitry. This circuitry is needed to compensate
for the parabolic behavior 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. 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, therefore, both the value of the counter and the number of counts per degree C (the
value of the slope accumulator) at a given temperature must be known.
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相关代理商/技术参数
DS1720S+
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
DS1720S+T&R
制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 3-WIRE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC
DS1720S+T&R
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
DS1720STR
制造商:Maxim Integrated Products 功能描述:
DS1721
制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:2-Wire Digital Thermometer and Thermostat
DS1721S
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
DS1721S/T&R
制造商:Maxim Integrated Products 功能描述:2-WIRE DIGITAL THERMOMETER SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG HP 8SOIC
DS1721S/T&R+W
制造商:Maxim Integrated Products 功能描述:DIGITAL THERMOMETER AND THERMOSTAT - Tape and Reel