參數(shù)資料
型號(hào)： DS18B20Z
元件分類(lèi)： 溫度傳感器
英文描述： Programmable Resolution 1-Wire Digital Thermometer
中文描述： 可編程的1 - Wire數(shù)字溫度計(jì)
文件頁(yè)數(shù)： 8/27頁(yè)
文件大?。?/td> 391K
代理商： DS18B20Z
DS18B20
8 of 27
1-WIRE CRC CODE
Figure 6
MEMORY
The DS18B20’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, and the configuration register. The scratchpad helps insure data integrity when communicating
over the 1-Wire bus. Data is first written to the scratchpad using the Write Scratchpad [4Eh] command.
It can then be verified by using the Read Scratchpad [BEh] command. After the data has been verified, a
Copy Scratchpad [48h] command will transfer the data to the nonvolatile (E
2
) RAM. This process insures
data integrity when modifying memory. The DS18B20 EEPROM is rated for a minimum of 50,000
writes and 10 years data retention at T = +55°C.
The scratchpad is organized as eight bytes of memory. The first 2 bytes contain the LSB and the MSB of
the measured temperature information, respectively. The third and fourth bytes are volatile copies of TH
and TL and are refreshed with every power-on reset. The fifth byte is a volatile copy of the configuration
register and is refreshed with every power-on reset. The configuration register will be explained in more
detail later in this section of the datasheet. The sixth, seventh, and eighth bytes are used for internal
computations, and thus will not read out any predictable pattern.
It is imperative that one writes TH, TL, and config in succession; i.e. a write is not valid if one writes
only to TH and TL, for example, and then issues a reset. If any of these bytes must be written, all three
must be written before a reset is issued.
There is a ninth byte which may be read with a Read Scratchpad [BEh] 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 Generation”.
Configuration Register
The fifth byte of the scratchpad memory is the configuration register.
It contains information which will be used by the device to determine the resolution of the temperature to
digital conversion. The bits are organized as shown in Figure 7.
DS18B20 CONFIGURATION REGISTER
Figure 7
0
R1
R0
1
1
1
1
1
MSb
LSb
Bits 0-4 are don’t cares on a write but will always read out “1”.
Bit 7 is a don’t care on a write but will always read out “0”.
(MSB)
XOR
XOR
XOR
(LSB)
INPUT
相關(guān)PDF資料
PDF描述
DS18S20Z High Precision 1-Wire Digital Thermometer
DS1923 Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
DS1923-F5 Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
DS1990 Serial Number iButton
DS1990A Serial Number iButton
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS18B20Z/T&R 制造商:Maxim Integrated Products 功能描述:HI RES MICROLAN DIG THERM 8-SOIC TR - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN PROG-RES 8SOIC 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
DS18B20Z/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(lèi)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
DS18B20Z+ 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(lèi)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
DS18B20Z+ 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW))
DS18B20Z+T&R 制造商:Maxim Integrated Products 功能描述:HI RES MICROLAN DIG THERM 8-SOIC TR 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL SERL (1-WIRE) 8SOIC N - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN PROG-RES 8SOIC 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*