Datasheet > DS18S20-PAR

DS18S20-PAR

更新时间： 2023-12-20 18:44:36

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	250K
描述
寄生供电数字温度计

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数据手册

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DS18S20-PAR 数据手册

DS18S20-PAR

1-WIRE BUS SYSTEM

The 1-Wire bus system uses a single bus master to control one or more slave devices. The DS18S20-

PAR 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-PAR (the DQ pin) is open drain with an internal circuit equivalent to that shown in Figure 8.

The 1-Wire bus requires an external pullup resistor of approximately 5 kꢁ; 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 ꢀs,

all components on the bus will be reset. In addition, to assure that the DS18S20-PAR has sufficient

supply current during temperature conversions, it is necessary to provide a strong pullup (such as a

MOSFET) on the 1-Wire bus whenever temperature conversions or EEPROM writes are taking place (as

described in the PARASITE POWER section).

HARDWARE CONFIGURATION Figure 8

V_PU

Micro-

DS18S20-PAR 1-WIRE PORT

Strong

Pullup

processor

4.7K

R_X

1-wire bus

R_X

5 µA

Typ.

T_X

100 ꢀ

MOSFET

R_X= RECEIVE

T_X= TRANSMIT

TRANSACTION SEQUENCE

The transaction sequence for accessing the DS18S20-PAR is as follows:

Step 1. Initialization

Step 2. ROM Command (followed by any required data exchange)

Step 3. DS18S20-PAR Function Command (followed by any required data exchange)

7 of 20

1...4 5 678 9 10...20

中文翻译

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与DS18S20-PAR相关器件

型号	品牌	获取价格	描述	数据表
DS18S20-PAR+T&R	MAXIM	获取价格	Serial Switch/Digital Sensor, 9 Bit(s), 0.50Cel, Round, Through Hole Mount, TO-92, 3 PIN
DS18S20-SL+T&R	MAXIM	获取价格	Serial Switch/Digital Sensor, 9 Bit(s), 0.50Cel, Rectangular, 3 Pin, Through Hole Mount, R
DS18S20Z	DALLAS	获取价格	High Precision 1-Wire Digital Thermometer
DS18S20Z	MAXIM	获取价格	Serial Switch/Digital Sensor, 9 Bit(s), 0.50Cel, Rectangular, 8 Pin, Surface Mount, SOP-8
DS18S20Z/T&R	MAXIM	获取价格	Serial Switch/Digital Sensor, 9 Bit(s), 0.50Cel, Rectangular, 8 Pin, Surface Mount, SOP-8
DS18S20Z+	MAXIM	获取价格	Serial Switch/Digital Sensor, 9 Bit(s), 0.50Cel, Rectangular, 8 Pin, Surface Mount, ROHS C
DS18S20Z+T&R	MAXIM	获取价格	Serial Switch/Digital Sensor, 9 Bit(s), 0.50Cel, Rectangular, 8 Pin, Surface Mount, ROHS C
DS18VN6FF100	BANNER	获取价格	DS18 Series Sensors
DS18VN6FF50	BANNER	获取价格	DS18 Series Sensors
DS18VN6LP	BANNER	获取价格	DS18 Series Sensors

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