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參數(shù)資料
| 型號： | DS1920 |
| 英文描述： | Temperature iButton |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 729K |
| 代理商： | DS1920 |
DS1920
8 of 22
1-WIRE CRC CODE
Figure 6
MEMORY
The DS1920’s memory is organized as shown in Figure 7. The memory consists of a scratchpad and 2
bytes of EEPROM which store the high and low temperature triggers TH and TL. The scratchpad helps
insure data integrity when communicating 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 EEPROM. This process insures data integrity when modifying the memory.
The scratchpad is organized as 8 bytes of memory. The first 2 bytes contain the measured temperature
information. The 3
rd
and 4
th
bytes are volatile copies of TH and TL and are refreshed with every power-on
reset. The next 2 bytes are not used; upon reading back, however, they will appear as all logic 1s. The 7
th
and 8
th
bytes are count registers, which may be used in obtaining higher temperature resolution (see
“Operation-Measuring Temperature” section).
There is a 9
th
byte which may be read with a Read Scratchpad command. This byte is a cyclic redundancy
check (CRC) over all of the 8 previous bytes. This CRC is implemented as described in the section titled
“CRC Generation.”
DS1920 MEMORY MAP
Figure 7
SCRATCHPAD
BYTE
EEPROM
TEMPERATURE LSB
0
TEMPERATURE MSB
TH/USER BYTE 1
TL/USER BYTE 2
RESERVED
RESERVED
COUNT REMAIN
COUNT PER °C
1
2
3
4
5
6
7
TH/USER BYTE 1
TL/USER BYTE 2
CRC
8
1-WIRE BUS SYSTEM
The 1-Wire bus is a system which has a single bus master and one or more slaves. The DS1920 behaves
as a slave. The discussion of this bus system is broken down into three topics: hardware configuration,
transaction sequence, and 1-Wire signaling (signal types and timing).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1920-F3 | Temperature iButton |
| DS1921 | High-Resolution Thermochron iButton |
| DS1921H-F5 | High-Resolution Thermochron iButton |
| DS1921Z-F5 | High-Resolution Thermochron iButton |
| DS1963L-F5 | NVRAM (Battery Based) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1920+F5 | 制造商:Maxim Integrated Products 功能描述:TEMP IBTN 2PIN F5 MICROCAN - Rail/Tube |
| DS1920-F3 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Temperature iButton |
| DS1920-F5 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1920-F5+ | 功能描述:iButton Temperature iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1921 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Resolution Thermochron iButton |
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