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參數(shù)資料
| 型號(hào)： | DS2480B+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 7/32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(lèi)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(lèi)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........................................................................................................................................................................................... 15
Falling Edges (DS2480B-initiated)
Whenever the DS2480B begins pulling the 1-Wire bus low to initiate a time slot, for example, it first
turns off the weak pullup current IWEAKPU. Then, at standard and Overdrive speeds it will generate a
falling edge at a slew rate of typically 15V/s. This value is acceptable for short 1-Wire busses and
adequate for communication at Overdrive speed. For 1-Wire networks of more than roughly 30m length
one should always use flexible speed. One of the parameters that is adjustable at flexible speed is the slew
rate of DS2480B-initiated falling edges. The effect of the slew rate control is shown in Figure 5.
Figure 5. SLEW RATE CONTROL
As extensive tests have shown, 1-Wire networks at a length of up to 300m will perform best if the fall
time tF is in the range of 4 ± 0.5s. This translates into a slew rate of approximately 1V/s. This slew rate
is typically achieved by setting the configuration parameter 001 (Pulldown Slew Rate Control) to a value
of 100 (see Table 4). If the actual measured fall time is longer than the target value, one should use a
value code of 011 or lower. If the fall time is shorter, one should use a value code of 101 or higher.
Once determined, the value code for the Pulldown Slew Rate Control parameter should be stored in the
host and always be loaded into the DS2480B after a power-on or master reset cycle.
TIMING DIAGRAMS
This section explains the waveforms generated by the DS2480B on the 1-Wire bus in detail. First the
communication waveforms such as the Reset/Presence Detect Sequence and the time slots are discussed.
After that follows a detailed description of the pulse function under various conditions.
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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(chēng):Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver |
| DS2480B+T | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver |
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