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DS2480B+T&R

更新时间： 2024-01-16 10:31:41
品牌 Logo 应用领域
美信 - MAXIM 线路驱动器或接收器驱动程序和接口接口集成电路光电二极管
页数 文件大小 规格书
32页 702K
描述
Line Driver, 1 Func, 1 Driver, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOP-8

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中文翻译

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DS2480B+T&R 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：8Reach Compliance Code：not_compliant
风险等级：5.87JESD-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

DS2480B+T&R 数据手册

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DS2480B  
of the pulse command is arming and disarming a strong pullup after every subsequent byte in Data Mode.  
The arm/disarm function is controlled by bit 1 of the command code. Bit 4 determines whether the device  
will generate a strong pullup to 5V or a 12V programming pulse. The table below summarizes these  
options.  
BIT 4 BIT 1  
FUNCTION  
0
1
0
1
0
0
1
1
Strong pullup to 5V and disarm  
12V programming pulse and disarm  
Strong pullup to 5V and arm  
12V programming pulse and arm  
The strong pullup to 5V is required to program EEPROM devices or to operate special function devices  
that require a higher current for a limited time after having received a “go and convert” command.  
Therefore, and because it significantly reduces the effective data throughput on the 1-Wire bus, the strong  
pullup is disarmed most of the time. Although arming or disarming is simultaneously possible while  
generating a programming pulse, this is not recommended since it is likely to destroy the DS2480B if  
non-EPROM devices are connected to the 1-Wire bus.  
The duration of the strong pullup or programming pulse is determined by configuration parameters and  
ranges from a few microseconds up to unlimited (see Configuration Commands section). However,  
unlimited duration is not allowed in conjunction with arming the strong pullup after every byte. As long  
as the DS2480B is in Command Mode the host may terminate a strong pullup or programming pulse  
prematurely at any time by sending the command code F1h.  
The response byte is generated as soon as the strong pullup or programming pulse is over (either because  
the predefined time has elapsed, the high current demand is over, or due to termination by the host). The  
response byte mainly returns the command code as sent by the host, but the 2 least significant bits are  
undefined.  
If the strong pullup is armed and the device is in Data Mode, the end of the strong pullup will be signaled  
as code F6h if the most significant bit of the preceding data byte on the 1-Wire bus is a 1 and 76h  
otherwise. The host will see this response byte in addition to the response on the data byte sent (see also  
Waveforms section later in this document).  
SEARCH ACCELERATOR INTRODUCTION  
The Search Accelerator is a logic block inside the DS2480B that allows using the Search ROM function  
very efficiently under modern operating systems. Without the DS2480B all 1-Wire port adapters have to  
involve the computer’s CPU for every single time slot or pulse to be generated on the 1-Wire bus.  
Under some operating systems it may take several milliseconds or more to get the first time slot generated  
on the 1-Wire bus when sending commands to the UART. Every subsequent time slot will be generated in  
much less time, since the computer simply sends out “streams”—a long chain of bytes. This works  
reasonably well when reading or writing large blocks of data.  
Searching the 1-Wire bus to identify all ROM IDs of the devices connected, however, requires reading 2  
bits, making a decision and then writing a bit. This procedure is to be repeated 64 times to identify and  
address a single device. With the overhead of modern operating systems this fairly simple process takes a  
lot of time, reducing the discovery rate of devices on the 1-Wire bus. To solve this problem the Search  
Accelerator was developed.  
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中文翻译

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DS2480B+T&R 替代型号

型号 品牌 替代类型 描述 数据表
DS2480B/T&R MAXIM

功能相似

 		Line Driver, 1 Func, 1 Driver, PDSO8, 0.150 INCH, SOP-8

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