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參數(shù)資料
| 型號(hào)： | DS2480B+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 31/32頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE DRVR W/SENSOR 1-W 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 線路驅(qū)動(dòng)器，發(fā)射器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/0 |
| 規(guī)程： | RS232 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1429 (CN2011-ZH PDF) |
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DS2480B
Maxim Integrated............................................................................................................................................................................................. 8
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
Strong pullup to 5V and disarm
1
0
12V programming pulse and disarm
0
1
Strong pullup to 5V and arm
1
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2480B | 制造商:Maxim Integrated Products 功能描述:IC SERIAL LINE DRIVER 2480 SOIC8 |
| DS2480B/T&R | 功能描述:緩沖器和線路驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| DS2480B+ | 功能描述:緩沖器和線路驅(qū)動(dòng)器 Serial - 1-Wire Line Driver RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| DS2480B+R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver |
| DS2480B+T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver |
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