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參數(shù)資料
| 型號： | COM20019ILJP |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 微控制器/微處理器 |
| 中文描述： | 1 CHANNEL(S), 312.5K bps, LOCAL AREA NETWORK CONTROLLER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 13/65頁 |
| 文件大小： | 386K |
| 代理商： | COM20019ILJP |
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Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Rev. 09-25-07
Page 20
SMSC COM20019I
DATASHEET
Figure 5.4 - COM20019I NETWORK USING RS-485 DIFFERENTIAL TRANSCEIVERS
In typical applications, the serial backplane is terminated at both ends and a bias is provided by the
external pull-up resistor.
The RXIN signal is directly connected to the cable via an internal Schmitt trigger. A negative pulse on this
input indicates a logic "1".
Lack of pulse indicates a logic "0".
For typical single-ended backplane
applications, RXIN is connected to nPULSE1 to make the serial backplane data line. A ground line (from
the coax or twisted pair) should run in parallel with the signal. For applications requiring different treatment
of the receive signal (like filtering or squelching), nPULSE1 and RXIN remain as independent pins.
External differential drivers/receivers for increased range and common mode noise rejection, for example,
would require the signals to be independent of one another. When the device is in Backplane Mode, the
clock provided by the nPULSE2 signal may be used for encoding the data into a different encoding
scheme or other synchronous operations needed on the serial data stream.
5.2.2
Differential Driver Configuration
The Differential Driver Configuration is a special case of the Backplane Mode.
It is a dc coupled
configuration recommended for applications like car-area networks or other cost-sensitive applications
which do not require direct compatibility with existing ARCNET nodes and do not require isolation.
The Differential Driver Configuration cannot communicate directly with nodes utilizing the Traditional
Hybrid Configuration.
Like the Backplane Configuration, the Differential Driver Configuration does not
isolate the node from the media.
The Differential Driver interface includes a RS485 Driver/Receiver to transfer the data between the cable
and the COM20019I. The nPULSE1 signal transmits the data, provided the Transmit Enable signal is
active. The nPULSE1 signal issues a 1.6S negative pulse to transmit a logic "1". Lack of pulse indicates
a logic "0". The RXIN signal receives the data, the transmitter portion of the COM20019I is disabled
during reset and the nPULSE1, nPULSE2 and nTXEN pins are inactive.
5.2.3
Programmable TXEN Polarity
To accommodate transceivers with active high ENABLE pins, the COM20019I contains a programmable
TXEN output. To program the TXEN pin for an active high pulse, the nPULSE2 pin should be connected
to ground. To retain the normal active low polarity, nPULSE2 should be left open.
The polarity
determination is made at power on reset and is valid only for Backplane Mode operation. The nPULSE2
pin should remain grounded at all times if an active high polarity is desired.
COM20019I
+VCC
RBIAS
+VCC
RBIAS
RT
75176B or
Equiv.
COM20019I
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| COM20019I-LJP | 制造商:SMSC 制造商全稱:SMSC 功能描述:Low Cost ARCNET(ANSI 878.1) Controller with 2k X 8 On-Board RAM |
| COM20019ILJP3V | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC ARCNET Contrllr RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| COM20019ILJPTR | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Arcnet (ANSI 878.1) Controllr 2k x 8 Ram RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| COM20019IP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| COM20020 | 制造商:SMSC 制造商全稱:SMSC 功能描述:COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM |
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