DS2480

更新时间： 2024-02-20 02:29:32

品牌	Logo	应用领域
达拉斯 - DALLAS		驱动器
页数	文件大小	规格书
26页	189K
描述
Serial 1.Wire Line Driver

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技术参数
数据手册

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DS2480 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOP, SOP8,.25
针数：	8	Reach Compliance Code：	not_compliant
风险等级：	5.87	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e0	湿度敏感等级：	1
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
电源：	5 V	认证状态：	Not Qualified
子类别：	Serial IO/Communication Controllers	标称供电电压：	5 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL

DS2480 数据手册

DS2480

DETAILED PIN DESCRIPTION

SYMBOL

GND

DESCRIPTION

Ground Pin: common ground reference and ground return for 1–Wire bus

1–W

1–Wire Input/Output Pin: 1–Wire bus with slew–rate–controlled pull–down,

active pull–up, ability to switch in V to program EPROM, and ability to switch

in V through a low–impedance path to program EEPROM, perform a temper-

ature conversion or operate the Crypto iButton.

No Connection Pin.

Power Input Pin: power supply for the chip and 1–Wire pull–up voltage. 5V ±

10%; may be derived from 12V V with an external voltage regulator.

EPROM Programming Voltage: 12V supply input for EPROM programming;

if EPROM programming is not required, this pin must be tied to V . V must

come up before V

POL

TXD

RXD

RXD/TXD Polarity Select: RXD/TXD polarity select; tied to GND for RS232

(12V or 5V) connection, tied to V for direct connection to UART chip.

Serial Data from UART: data input from host (inverted or true); maximum volt-

age swing –0.3V to V + 0.3V; for logic thresholds see DC specifications.

Serial Data to UART: signal output to host; push–pull driver with CMOS com-

patible levels; for true ±12V RS232 systems an external level–translator must

be provided.

POL, but the polarity at RXD will be the opposite of what

OVERVIEW

The DS2480 directly interfaces a 5V serial communica-

tion port with its lines TXD (transmit) and RXD (receive)

to a1–Wirebus. Inadditionthedeviceperformsaspeed

conversion allowing the data rate at the communication

port to be different from the 1–Wire date rate. Several

parameters relating to the 1–Wire port and its timing as

well as the communication speed at both the port and

the 1–Wire bus are configurable. The circuit to achieve

these functions is outlined in Figure 1, Block Diagram.

the logic level at POL specifies.

As data enters the core of the DS2480’s logic circuitry, it

is analyzed to separate data and command bytes and to

calibrate the device’s timing generator. The timing gen-

erator controls all speed relations of the communication

interface and the 1–Wire bus as well as the wave forms

on the 1–Wire bus.

Command bytes either affect the configuration setting

or generate certain wave forms on the 1–Wire bus. Data

bytes are simply translated by the protocol converter

into the appropriate 1–Wire activities. Each data byte

generates a return byte from the 1–Wire bus, that is

communicated back to the host through the RXD pin as

soon as the activity on the 1–Wire bus is completed.

The device gets its input data from the serial commu-

nication port of the host computer through pin TXD. For

compatibilitywith active–high as well as active–low sys-

tems, the incoming signal can be inverted by means of

the polarity input POL. The polarity chosen by hard–wir-

ingthelogiclevelofthispinisalsovalidfortheoutputpin

RXD. If for minimizing the interface hardware an asym-

metry between RXD and TXD is desired, this can be

achieved by setting the most significant bit of the Speed

Control parameter to a 1 (see Configuration Parameter

ValueCodes). WiththeMSbitofthespeedcontrolsetto

1, the polarity at TXD is still selected by the logic level at

The 1–Wire driver shapes the slopes of the 1–Wire

wave forms, applies programming pulses or strong

pull–upto5voltsandreadsthe1–Wirebususinganon–

TTL threshold to maximize the noise margin for best

performance on large 1–Wire MicroLAN networks.

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与DS2480相关器件

型号	品牌	描述	获取价格	数据表
DS2480B	MAXIM	Serial to 1-Wire Line Driver	获取价格
DS2480B	DALLAS	Serial 1-Wire Line Driver with Load Sensor	获取价格
DS2480B	ADI	串行、1-Wire线驱动器	获取价格
DS2480B/T&R	MAXIM	Line Driver, 1 Func, 1 Driver, PDSO8, 0.150 INCH, SOP-8	获取价格
DS2480B+	MAXIM	Serial to 1-Wire Line Driver	获取价格
DS2480B+R	MAXIM	Serial to 1-Wire Line Driver	获取价格

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