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DS1721
 
 
 
2 of 17
ORDERING INFORMATION
ORDERING
INFORMATION
PACKAGE
MARKING
DESCRIPTION
DS1721S
DS1721
DS1721 in 150 mil 8-pin SO
DS1721S+
DS1721 (See Note)    DS1721 in Lead-Free 150 mil 8-pin SO
DS1721S/T&R
DS1721
DS1721 in 150 mil 8-pin SO, 2500 Piece Tape-and-Reel
DS1721S+T&R
DS1721 (See Note)    DS1721 in Lead-Free 150 mil 8-pin SO, 2500 Piece Tape-
and-Reel
DS1721U
1721
DS1721 in 8-pin uSOP
DS1721U+
1721 (See Note)
DS1721 in Lead-Free 8-pin uSOP
DS1721U/T&R
1721
DS1721 in 8-pin uSOP, 3000 Piece Tape-and-Reel
DS1721U+T&R
1721 (See Note)
DS1721 in Lead-Free 8-pin uSOP, 3000 Piece Tape-and-Reel
Note: A + symbol will also be marked on the package near the Pin 1 indicator.
 
 
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
T
OUT
 
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
V
DD
 
Supply Voltage. 2.7V to 5.5V input power pin. 
 
OVERVIEW
A block diagram of the DS1721 is shown in Figure 1.
The DS1721 consists of five major components:
 
1.   Precision temperature sensor
 
2.   Analog-to-digital converter
 
3.   2-wire interface electronics
 
4.   Data registers
 
5.   Thermostat comparator
 
The factory-calibrated temperature sensor requires no external components. Upon power-up, the DS1721
is in an idle mode. Upon issuance of a Start Convert T command [51h], the DS1721 begins temperature
conversions with the default resolution of 12 bits (0.0625癈 resolution). Following an 8-bit command
protocol, temperature data can be read over the 2-wire interface. The host can periodically read the value
in the temperature register, which contains the last completed conversion. As conversions are performed
in the background, reading the temperature register does not affect the conversion in progress.
 
In power-sensitive applications, the user can put the DS1721 in a one-shot mode, under which the
sensor will complete and store one temperature conversion and return to a low-power standby state. In
time-sensitive applications, the user can change the conversion resolution from 12 bits to 9, 10, or 11.
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相关代理商/技术参数
DS1721U-T,R 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2-Wire Digital Thermometer and Thermostat
DS1722 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Digital Thermometer with SPI/3-Wire Interface
DS1722S 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
DS1722S/T&R 制造商:Maxim Integrated Products 功能描述:SPI 3-WIRE THERMOMETER SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER DIG 3-WIRE 8-SOIC
DS1722S/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
DS1722S+ 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
DS1722S+T&R 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 3-WIRE/SPI 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER DIG 3-WIRE 8-SOIC
DS1722S+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