參數(shù)資料
型號(hào)： SP3243HCT
元件分類(lèi)： 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收發(fā)器與0.1uF電容
文件頁(yè)數(shù)： 17/23頁(yè)
文件大?。?/td> 164K
代理商： SP3243HCT
Rev. 6/30/03
SP3223H +3.0V to +5.5V RS-232 Transceivers
17
Copyright 2003 Sipex Corporation
Auto-Online Circuitry
The
SP3223H
and
SP3243H
devices have a
patent pending
Auto-Online
circuitry on board
that saves power in applications such as laptop
computers, palmtop (PDA) computers and other
portable systems.
The
SP3223H
and
SP3243H
devices
incorporate an
Auto-Online
circuit that
automatically enables itself when the external
transmitters are enabled and the cable is
connected. Conversely, the
Auto-Online
circuit
also disables most of the internal circuitry when
the device is not being used and goes into a
standby mode where the device typically draws
1
μ
A. This function can also be externally
controlled by the ONLINE pin. When this pin is
tied to a logic LOW, the
Auto-Online
function
is active. Once active, the device is enabled
until there is no activity on the receiver inputs.
The receiver input typically sees at least
+3V, which are generated from the transmitters
at the other end of the cable with a +5V
minimum. When the external transmitters are
disabled or the cable is disconnected, the
receiver inputs will be pulled down by their
internal 5k
resistors to ground. When this
occurs over a period of time, the internal
transmitters will be disabled and the device goes
into a shutdown or standy mode. When ONLINE
is HIGH, the
Auto-Online
mode is disabled.
The
Auto-Online
circuit has two stages:
1) Inactive Detection
2) Accumulated Delay
The first stage, shown in
Figure 23
, detects an
inactive input. A logic HIGH is asserted on
R
INACT if the cable is disconnected or the
external transmitters are disabled. Otherwise,
R
INACT will be at a logic LOW. This circuit
is duplicated for each of the other receivers.
The second stage of the
Auto-Online
circuitry,
shown in
Figure 24
, processes all the receiver's
R
INACT signals with an accumulated delay
that disables the device to a 1
μ
A supply current.
The STATUS pin goes to a logic LOW when the
cable is disconnected, the external transmitters
are disabled, or the SHUTDOWN pin is
invoked. The typical accumulated delay is
around 20
μ
s.
When the
SP3223H
and
SP3243H
drivers or
internal charge pump are disabled, the supply
current is reduced to 1
μ
A. This can commonly
occur in hand-held or portable applications where
the RS-232 cable is disconnected or the RS-232
drivers of the connected peripheral are turned off.
The
Auto-Online
mode can be disabled 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
SP3223H
and
SP3243H
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 transmitters are
enabled and the cable is connected.
When the
SP3223H
and
SP3243H
devices
are shut down, the charge pumps are 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.
For easy programming, the STATUS can be
used to indicate DTR or a Ring Indicator signal.
Tying ONLINE and SHUTDOWN together
will bypass the
Auto-Online
circuitry so this
connection acts like a shutdown input pin.
相關(guān)PDF資料
PDF描述
SP3223UEP Surround-Sound CODEC IC; IC Function:Surround-Sound CODEC IC; Package/Case:52-MQFP; Leaded Process Compatible:No; No. of Bits:24; Operating Temp. Max:85 C; Operating Temp. Min:-40 C; Peak Reflow Compatible (260 C):No RoHS Compliant: Yes
SP3223UEY Surround-Sound CODEC IC; IC Function:Surround-Sound CODEC IC; Package/Case:52-MQFP; IC Generic Number:42438; Leaded Process Compatible:No; Number of Bits:24; Number of Channels:8; Operating Temp. Max:70 C
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