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參數(shù)資料
| 型號(hào)： | IL3685E |
| 廠商： | NVE Corp/Isolation Products |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | PROFIBUS RS-485 INTERFACE ISO |
| 產(chǎn)品培訓(xùn)模塊： | IsoLoop® Isolator |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 系列： | IsoLoop® |
| 類型： | 收發(fā)器，隔離式 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS485 |
| 電源電壓： | 3 V ~ 5.5 V，4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 管件 |
| 其它名稱： | 390-1132 IL3685E-ND Q4618328 |
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IL3685
10
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.com
NVE Corporation
Termination and Fail-Safe Biasing
Internal Biasing Resistors
“Fail-safe biasing” forces a logic high state on “R” in response to an open-circuit condition between the bus “A” and “B” lines, or when no
drivers are active on the bus. IL3000-Series Isolated Transceivers include internal pull-up and pull-down resistors of approximately 30 k in the
receiver section (RFS-INT in Figure 2 below):
R
B
V
DD
30K
GND
A
5 V
R
FS-EXT
R
T
R
T
R
FS-EXT
R
FS-INT
R
FS-INT
Figure 2. Termination and internal and external fail-safe biasing resistors.
These internal resistors ensure fail-safe operation if there are no termination resistors and up to four RS-485 worst-case Unit Loads of 12 k.
Termination Resistors
Termination resistors should be on both ends of the network to minimize reflections. Values should be selected to match cable impedance; 220
resistors are typical for PROFIBUS.
External Fail-Safe Biasing Resistors
Termination resistors bring the differential voltage across the conductor pair close to zero with no active drivers. In this case, the idle bus is
indeterminate and susceptible to noise. External fail-safe biasing resistors (labeled RFS-EXT in Figure 2) at one end of the bus ensure fail-safe
operation with a terminated bus. Biasing should provide at least 200 mV across the conductor pair to meet the RS-485 input sensitivity
specification. Fail-safe resistors of 390 are common for PROFIBUS. They should be on only one node of the network. Using the same value
for pull-up and pull-down biasing resistors maintains balance for positive- and negative going transitions.
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