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參數資料
| 型號： | DS18B20+PAR |
| 廠商： | Maxim Integrated |
| 文件頁數： | 3/19頁 |
| 文件大小： | 221K |
| 描述： | IC THERM MICROLAN PROG-RES TO-92 |
| 產品培訓模塊： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 500 |
| 功能： | 溫度計，恒溫計 |
| 傳感器類型： | 內部 |
| 感應溫度： | -55°C ~ 100°C |
| 精確度： | ±2°C（最小值） |
| 拓撲： | 寄存器庫，變簽式暫存器 |
| 輸出類型： | 1-Wire? |
| 輸出警報： | 是 |
| 輸出風扇： | 無 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -55°C ~ 100°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | TO-226-3、TO-92-3 標準主體 |
| 供應商設備封裝： | TO-92-3 |
| 包裝： | 管件 |
| 產品目錄頁面： | 1435 (CN2011-ZH PDF) |
DS18B20-PAR
3 of 19
PARASITE POWER
The DS18B20-PARs parasite power circuit allows the DS18B20-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 DS18B20-PARs 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 DS18B20-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 DS18B20-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 DS18B20-PAR is performing temperature conversions or copying data from the
scratchpad memory to EEPROM, the operating current can be as high as 1.5 mA. 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 DS18B20-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 約 (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
= 10 ms).
No other activity can take place on the 1-Wire bus while the pullup is enabled.
SUPPLYING THE DS18B20-PAR DURING TEMPERATURE CONVERSIONS
Figure 2
OPERATION MEASURING TEMPERATURE
The core functionality of the DS18B20-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癈, 0.25癈, 0.125癈, and 0.0625癈, respectively. The default resolution at power-up is 12-bit.
The DS18B20-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
DS18B20-PAR returns to its idle state. The DS18B20-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 twos 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 DS18B20-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
V
PU
V
PU
4.7K
1-Wire Bus
Micro-
processor
DS18B20-PA
GND DQ
To Other
1-Wire Devices
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相關代理商/技術參數 |
參數描述 |
|---|---|
| DS18B20-PAR/T&R | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS18B20-PAR_07 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire Parasite-Power Digital Thermometer |
| DS18B20-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 THERM MICROLAN PROG-RES TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr |
| DS18B20-PAR+T&R | 功能描述:板上安裝溫度傳感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS18B20-SL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Programmable Resolution 1-Wire Digital Thermometer |
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