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参数资料
| 型号： | DS1822+PAR |
| 厂商： | Maxim Integrated |
| 文件页数： | 3/19页 |
| 文件大小： | 0K |
| 描述： | IC THERMOMETER ECONO DIG TO-92 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 感应温度： | -55°C ~ 125°C |
| 输出类型： | 数字 |
| 电源电压： | 3 V ~ 5 V |
| 精确度： | ±2°C |
| 封装/外壳： | TO-226-3、TO-92-3 标准主体 |
| 供应商设备封装： | TO-92-3 |
| 包装： | 管件 |
DS1822-PAR
PARASITE POWER
The DS1822-PAR’s parasite power circuit allows the DS1822-PAR to operate without a local external
power supply. This ability is especially useful for applications that require remote temperature sensing or
that are very space constrained. Figure 1 shows the DS1822-PAR’s parasite-power control circuitry,
which “steals” power from the 1-Wire bus via the DQ pin when the bus is high. The stolen charge powers
the DS1822-PAR while the bus is high, and some of the charge is stored on the parasite power capacitor
(C PP ) to provide power when the bus is low.
The 1-Wire bus and C PP can provide sufficient parasite power to the DS1822-PAR for most operations as
long as the specified timing and voltage requirements are met (refer to the DC ELECTRICAL
CHARACTERISTICS and the AC ELECTRICAL CHARACTERISTICS sections of this data sheet).
However, when the DS1822-PAR is performing temperature conversions or copying data from the
scratchpad memory to EEPROM, the operating current can be as high as 1.5mA. This current can cause
an unacceptable voltage drop across the weak 1-Wire pullup resistor and is more current than can be
supplied by C PP . To assure that the DS1822-PAR has sufficient supply current, it is necessary to provide a
strong pullup on the 1-Wire bus whenever temperature conversions are taking place or data is being
copied from the scratchpad to EEPROM. This can be accomplished by using a MOSFET to pull the bus
directly to the rail as shown in Figure 2. The 1-Wire bus must be switched to the strong pullup within
10 μ s (max) after a Convert T [44h] or Copy Scratchpad [48h] command is issued, and the bus must be
held high by the pullup for the duration of the conversion (t conv ) or data transfer (t wr = 10ms). No other
activity can take place on the 1-Wire bus while the pullup is enabled.
SUPPLYING THE DS1822-PAR DURING TEMPERATURE CONVERSIONS
Figure 2
V PU
DS1822-PAR
Micro-
processor
V PU
4.7k
1-Wire Bus
GND
DQ
To Other
1-Wire Devices
OPERATION—MEASURING TEMPERATURE
The core functionality of the DS1822-PAR is its direct-to-digital temperature sensor. The resolution of
the temperature sensor is user-configurable to 9, 10, 11, or 12 bits, which corresponds to increments of
0.5 ° C, 0.25 ° C, 0.125 ° C, and 0.0625 ° C, respectively. The default resolution at power-up is 12-bit.
The DS1822-PAR powers-up in a low-power idle state; to initiate a temperature measurement and A-to-D
conversion, the master must issue a Convert T [44h] command. Following the conversion, the resulting
thermal data is stored in the 2-byte temperature register in the scratchpad memory and the DS1822-PAR
returns to its idle state. The DS1822-PAR output data is calibrated in degrees centigrade; for Fahrenheit
applications, a lookup table or conversion routine must be used. The temperature data is stored as a 16-bit
sign-extended two’s complement number in the temperature register (see Figure 3). The sign bits (S)
indicate if the temperature is positive or negative: for positive numbers S = 0 and for negative numbers S
= 1. If the DS1822-PAR is configured for 12-bit resolution, all bits in the temperature register will
contain valid data. For 11-bit resolution, bit 0 is undefined. For 10-bit resolution, bits 1 and 0 are
undefined, and for 9-bit resolution bits 2, 1 and 0 are undefined. Table 2 gives examples of digital output
data and the corresponding temperature reading for 12-bit resolution conversions.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1822-PAR/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 |
| DS1822-PAR_07 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Econo 1-Wire Parasite-Power Digital Thermometer |
| DS1822-PAR+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 1-WIRE 3PIN TO-92 - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER ECONO DIG TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors 1-Wire Digital Thermometer |
| DS1822-PAR+T&R | 功能描述:板上安装温度传感器 1-Wire Digital Thermometer 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 |
| DS-18-22-RS | 制造商:TE Connectivity 功能描述:Red sealed splice terminal,0.5-1.5sq.mm |
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