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| 型号： | SP3221E |
| 元件分类： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收发器与0.1uF电容 |
| 文件页数： | 13/18页 |
| 文件大小： | 115K |
| 代理商： | SP3221E |
13
Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
Copyright 2004 Sipex Corporation
Auto-Online Circuitry
The
SP3221E
device has an
Auto-Online
cir-
cuitry on board that saves power in the system
the device is designed into without changes to
the existing BIOS or operating system.
The
SP3221E
device incorporates an
Auto-Online
circuit that automatically
enables itself when the cable is connected to
another RS232 device. Conversely, the
Auto-
Online
circuit also disables most of the internal
circuitry when the cable is disconnected and
goes into a standby mode where the device
typically draws 1
μ
A. This function is controlled
by the ONLINE pin. When this pin is tied to a
logic LOW, the
Auto-Online
function is active.
When the cable is disconnected, the receiver
inputs will be pulled down by its internal 5k
resistors to ground. When ONLINE is HIGH,
the
Auto-Online
mode is disabled.
When the
SP3221E
driver or internal charge
pump are disabled, the supply current is reduced
to 1
μ
A.
The
Auto-Online
mode can be overridden by the
SHUTDOWN pin. If this pin is a logic LOW,
the
Auto-Online
function will not operate
regardless of the logic state of the ONLINE pin.
Table 3
summarizes the logic of the
Auto-Online
operating modes. The truth table logic of the driver
and receiver outputs can be found in
Table 2.
The STATUS pin outputs a logic LOW signal
if the device is shutdown. This pin goes to a
logic HIGH when the external cable is connected
to another RS232 device.
When the
SP3221E
device is shutdown, the
charge pump is turned off. V+ charge pump
output decays to V
, the V- output decays to
GND. The decay time will depend on the size of
capacitors used for the charge pump. Once in
shutdown, the time required to exit the shut
down state and have valid V+ and V- levels is
typically 200
μ
s.
Tying ONLINE and SHUTDOWN together
will bypass the
Auto-Online
circuitry so this
connection acts like a shutdown input pin.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3221ECA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver |
| SP3221ECA/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver |
| SP3221ECY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver |
| SP3221ECY/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver |
| SP3221ECY-L | 功能描述:RS-232接口集成电路 Intelligent 3-5.5V RS-232 Xcvr RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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