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參數資料
| 型號： | DS18S20 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | High Precision 1-Wire Digital Thermometer(高精度1線數字溫度計) |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT |
| 封裝： | TO-92, 3 PIN |
| 文件頁數： | 8/21頁 |
| 文件大小： | 150K |
| 代理商： | DS18S20 |
DS18S20
8 of 21
1-WIRE BUS SYSTEM
The 1-wire bus system uses a single bus master to control one or more slave devices. The DS18S20 is
always a slave. When there is only one slave on the bus, the system is referred to as a “single-drop”
system; the system is “multi-drop” if there are multiple slaves on the bus.
All data and commands are transmitted least significant bit first over the 1-wire bus.
The following discussion of the 1-wire bus system is broken down into three topics: hardware
configuration, transaction sequence, and 1-wire signaling (signal types and timing).
HARDWARE CONFIGURATION
The 1-wire bus has by definition only a single data line. Each device (master or slave) interfaces to the
data line via an open drain or 3–state port. This allows each device to “release” the data line when the
device is not transmitting data so the bus is available for use by another device. The 1-wire port of the
DS18S20 (the DQ pin) is open drain with an internal circuit equivalent to that shown in Figure 9.
The 1-wire bus requires an external pullup resistor of approximately 5 k
; thus, the idle state for the 1-
wire bus is high. If for any reason a transaction needs to be suspended, the bus MUST be left in the idle
state if the transaction is to resume. Infinite recovery time can occur between bits so long as the 1-wire
bus is in the inactive (high) state during the recovery period. If the bus is held low for more than 480
μ
s,
all components on the bus will be reset.
HARDWARE CONFIGURATION
Figure
=V=
TRANSACTION SEQUENCE
The transaction sequence for accessing the DS18S20 is as follows:
Step 1. Initialization
Step 2. ROM Command (followed by any required data exchange)
Step 3. DS18S20 Function Command (followed by any required data exchange)
It is very important to follow this sequence every time the DS18S20 is accessed, as the DS18S20 will not
respond if any steps in the sequence are missing or out of order. Exceptions to this rule are the Search
ROM [F0h] and Alarm Search [ECh] commands. After issuing either of these ROM commands, the
master must return to Step 1 in the sequence.
V
PU
4.7K
5 μA
Typ.
R
X
T
X
DS18S20 1-WIRE PORT
100
MOSFET
T
X
R
X
R
X
= RECEIVE
T
X
= TRANSMIT
1-wire Bus
DQ
Pin
相關PDF資料 |
PDF描述 |
|---|---|
| DS1920 | Temperature Button(溫度按鈕) |
| DS1962 | 1K-Bit Monetary iButton(1K位貨幣按鈕) |
| DS1963 | 4K-Bit Monetary iButton(4K位貨幣按鈕) |
| DS1981U | UniqueWare iButton(唯一貨品按鈕) |
| DS1982U | UniqueWare iButton(UniqueWare iButton標準的EPROM) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS18S20/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI PREC TO-92 |
| DS18S20/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: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS18S20+ | 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 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS18S20+PAR | 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 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS18S20+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE 3PIN TO-92 - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr |
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