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參數(shù)資料
| 型號： | DS1822+T&R |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| 封裝： | LEAD FREE, TO92-3 |
| 文件頁數(shù)： | 18/21頁 |
| 文件大小： | 222K |
| 代理商： | DS1822+T&R |
DS1822
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The use of parasite power is not recommended for temperatures above 100
°C since the DS1822 may not
be able to sustain communications due to the higher leakage currents that can exist at these temperatures.
For applications in which such temperatures are likely, it is strongly recommended that the DS1822 be
powered by an external power supply.
In some situations the bus master may not know whether the DS1822s on the bus are parasite powered or
powered by external supplies. The master needs this information to determine if the strong bus pullup
should be used during temperature conversions. To get this information, the master can issue a Skip ROM
[CCh] command followed by a Read Power Supply [B4h] command followed by a “read-time slot”.
During the read time slot, parasite powered DS1822s will pull the bus low, and externally powered
DS1822s will let the bus remain high. If the bus is pulled low, the master knows that it must supply the
strong pullup on the 1-Wire bus during temperature conversions.
SUPPLYING THE PARASITE-POWERED DS1822 DURING TEMPERATURE
CONVERSIONS Figure 4
POWERING THE DS1822 WITH AN EXTERNAL SUPPLY Figure 5
64-BIT LASERED ROM CODE
Each DS1822 contains a unique 64–bit code (see Figure 6) stored in ROM. The least significant 8 bits of
the ROM code contain the DS1822’s 1-Wire family code: 22h. The next 48 bits contain a unique serial
number. The most significant 8 bits contain a cyclic redundancy check (CRC) byte that is calculated from
the first 56 bits of the ROM code. A detailed explanation of the CRC bits is provided in the CRC
GENERATION section. The 64-bit ROM code and associated ROM function control logic allow the
DS1822 to operate as a 1-Wire device using the protocol detailed in the 1-WIRE BUS SYSTEM section
of this data sheet.
64-BIT LASERED ROM CODE Figure 6
8-BIT CRC
48-BIT SERIAL NUMBER
8-BIT FAMILY CODE (22h)
MSB
LSB
MSB
VDD (External Supply)
DS1822
GND
VDD
DQ
VPU
4.7k
To Other
1-Wire Devices
1-Wire Bus
Micro-
processor
VPU
4.7k
1-Wire Bus
Micro-
processor
DS1822
GND
VDD
DQ
To Other
1-Wire Devices
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1822Z | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| DS18B20-PAR/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT |
| DS18B20-PAR | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT |
| DS18B20P | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
| DS18B20X | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1822-W | 制造商:Maxim Integrated Products 功能描述:1-WIRE DIGITAL THERMOMETER SOIC - Rail/Tube |
| DS1822Z | 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(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS1822Z/T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Econo 1-Wire Digital Thermometer |
| DS1822Z/T&R | 制造商:Maxim Integrated Products 功能描述:1-WIRE DIGITAL THERMOMETER SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER ECONO DIG 8-SOIC |
| DS1822Z/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(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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