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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)： | 2/27頁 |
| 文件大?。?/td> | 151K |
| 代理商： | DS1820 |
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DS1820
030598 2/27
DETAILED PIN DESCRIPTION
PIN
16–PIN SSOP
PIN
PR35
SYMBOL
DESCRIPTION
9
1
GND
Ground.
8
2
DQ
Data Input/Output pin.
For 1–Wire operation: Open drain. (See
“Parasite Power” section.)
7
3
V
DD
Optional V
DD
pin
. See “Parasite Power” section for details of
connection.
DS1820S (16–pin SSOP): All pins not specified in this table are not to be connected.
OVERVIEW
The block diagram of Figure 1 shows the major compo-
nents of the DS1820. The DS1820 has three main data
components: 1) 64–bit lasered ROM, 2) temperature
sensor, and 3) nonvolatile temperature alarm triggers
TH and TL. The device derives its power from the
1–Wire communication line by storing energy on an
internal capacitor during periods of time when the signal
line is high and continues to operate off this power
source during the low times of the 1–Wire line until it
returns high to replenish the parasite (capacitor) supply.
As an alternative, the DS1820 may also be powered
from an external 5 volts supply.
Communication to the DS1820 is via a 1–Wire port. With
the 1–Wire port, the memory and control functions will
not be available before the ROM function protocol has
been established. The master must first provide one of
five ROM function commands: 1) Read ROM, 2) Match
ROM, 3) Search ROM, 4) Skip ROM, or 5) Alarm
Search. These commands operate on the 64–bit
lasered ROM portion of each device and can single out
a specific device if many are present on the 1–Wire line
as well as indicate to the Bus Master how many and
what types of devices are present. After a ROM function
sequence has been successfully executed, the memory
and control functions are accessible and the master
may then provide any one of the six memory and control
function commands.
One control function command instructs the DS1820 to
perform a temperature measurement. The result of this
measurement will be placed in the DS1820’s scratch-
pad memory, and may be read by issuing a memory
function command which reads the contents of the
scratchpad memory. The temperature alarm triggers
TH and TL consist of one byte EEPROM each. If the
alarm search command is not applied to the DS1820,
these registers may be used as general purpose user
memory. Writing TH and TL is done using a memory
function command. Read access to these registers is
through the scratchpad. All data is read and written
least significant bit first.
DS1820 BLOCK DIAGRAM
Figure 1
64–BIT ROM
AND
1–WIRE PORT
SCRATCHPAD
CMEMORY AND
TEMPERATURE SENSOR
8–BIT CRC
POWER
SENSE
DQ
V
DD
INTERNAL V
DD
HIGTRIGGER, TH
LOW TEMPERATURE
TRIGGER, TL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1821 | Programmable Digital Thermostat |
| DS1830 | Reset Sequence Pushbutton |
| DS1830A | Reset Sequence Pushbutton |
| DS1830AS | Reset Sequence Pushbutton |
| DS1830AU | Reset Sequence Pushbutton |
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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