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參數(shù)資料
| 型號(hào)： | DS1820 |
| 英文描述： | 1-Wire Digital Thermometer |
| 文件頁數(shù)： | 8/27頁 |
| 文件大?。?/td> | 151K |
| 代理商： | DS1820 |
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DS1820
030598 8/27
1–WIRE CRC CODE
Figure 7
(MSB)
(LSB)
XOR
XOR
XOR
INPUT
MEMORY
The DS1820’s memory is organized as shown in
Figure 8. The memory consists of a scratchpad RAM
and a nonvolatile, electrically erasable (E
2
) RAM, which
stores the high and low temperature triggers TH and TL.
The scratchpad helps insure data integrity when com-
municating over the 1–Wire bus. Data is first written to
the scratchpad where it can be read back. After the data
has been verified, a copy scratchpad command will
transfer the data to the nonvolatile (E
2
) RAM. This pro-
cess insures data integrity when modifying the memory.
The scratchpad is organized as eight bytes of memory.
The first two bytes contain the measured temperature
information. The third and fourth bytes are volatile
copies of TH and TL and are refreshed with every pow-
er–on reset. The next two bytes are not used; upon
reading back, however, they will appear as all logic 1’s.
The seventh and eighth bytes are count registers, which
may be used in obtaining higher temperature resolution
(see “Operation–measuring Temperature” section).
There is a ninth byte which may be read with a Read
Scratchpad command. This byte contains a cyclic
redundancy check (CRC) byte which is the CRC over all
of the eight previous bytes. This CRC is implemented in
the fashion described in the section titled “CRC Genera-
tion”.
DS1820 MEMORY MAP
Figure 8
TEMPERATURE LSB
TEMPERATURE MSB
TH/USER BYTE 1
TL/USER BYTE 2
RESERVED
RESERVED
COUNT REMAIN
CRC
BYTE
0
1
2
3
4
5
6
7
8
TH/USER BYTE 1
TL/USER BYTE 2
SCRATCHPAD
E
2
RAM
COUNT PER
°
C
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| DS1821 | Programmable Digital Thermostat |
| DS1830 | Reset Sequence Pushbutton |
| DS1830A | Reset Sequence Pushbutton |
| DS1830AS | Reset Sequence Pushbutton |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1820K | 制造商:Maxim Integrated Products 功能描述:THERMOMETER DEMO KIT |
| DS1820S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DS1820.DS1820S Digital Thermometer Replacements |
| DS1821 | 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 |
| DS1821_07 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Programmable Digital Thermostat and Thermometer |
| DS1821+ | 功能描述:板上安裝溫度傳感器 Programmable Digital Thermostat/Thrmmtr 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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