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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： | 9/16页 |
| 文件大小： | 647K |
| 代理商： | DS1621S |
DS1621
2 of 16
102299
DETAILED PIN DESCRIPTION Table 1
PIN
SYMBOL
DESCRIPTION
1
SDA
Data input/output pin for 2-wire serial communication port.
2
SCL
Clock input/output pin for 2-wire serial communication port.
3
TOUT
Thermostat output. Active when temperature exceeds TH; will reset when
temperature falls below TL.
4
GND
Ground pin.
5
A2
Address input pin.
6
A1
Address input pin.
7
A0
Address input pin.
8
VDD
Supply voltage input power pin. (2.7V – 5.5V)
OPERATION
Measuring Temperature
A block diagram of the DS1621 is shown in Figure 1. The DS1621 measures temperatures through the
use of an onboard proprietary temperature measurement technique. A block diagram of the temperature
measurement circuitry is shown in Figure 2.
The DS1621 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 –55
°C. If the counter reaches 0
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 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 0. 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, both the value of the counter and the number of counts per
°C (the value of the
slope accumulator) at a given temperature must be known.
This calculation is done inside the DS1621 to provide 0.5
°C resolution. The temperature reading is
provided in a 9–bit, two’s complement reading by issuing the READ TEMPERATURE command. Table
2 describes the exact relationship of output data to measured temperature. The data is transmitted through
the 2–wire serial interface, MSB first. The DS1621 can measure temperature over the range of –55
°C to
+125
°C in 0.5°C increments. For Fahrenheit usage a lookup table or conversion factor must be used.
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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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