參數(shù)資料
型號(hào)： SP522CT
英文描述： Low-Cost Programmable Multi-Protocol Transceivers
中文描述： 低成本可編程多協(xié)議收發(fā)器
文件頁(yè)數(shù)： 16/23頁(yè)
文件大?。?/td> 200K
代理商： SP522CT
16
Rev. 7/10/03
SP522 Multi–Mode Serial Transceivers
Copyright 2003 Sipex Corporation
APPLICATIONS INFORMATION
DCE-DTE Applications
A serial port can be easily configured for DTE
and DCE using multiple
SP522
and/or
SP524
parts. As shown on
Figure 14
, the transceivers
are half-duplexed to provide convenient DCE-
DTE capability. The driver outputs are con-
nected to the receiver inputs with only one pair
out to the serial port for each driver/receiver.
When the driver is tri-stated by applying a logic
low ("0") to ENT, the receivers can be active to
receive the appropriate input. The driver output
during tri-state is high impedance, therefore
will not degrade the signal levels of the receiver
input signal. When the receiver is tri-stated by
applying a logic ("1") to ENR, the driver output
is active to drive the appropriate signal without
interference from the receiver. The receiver
inputs are at least 12k
to ground during tri-state.
Configuring Additional Multi-Protocol
Transceivers
Serial ports usually can have two data signals
(SD, RD), three clock signals (TT, ST, RT), and
at least eight control signals (CS, RS, etc.).
EIA-RS-449 contains twenty six signal types
including for a DB-37 connector. A DB-37
serial port design may require thirteen drivers
and fourteen receivers. Although many
applications do not use all these signals, some
applications may need to support extra
functions such as diagnostics. Sipex's SP504
supports enough transceivers for the primary
channels of data, clock and control signals.
Configuring LL, RL and TM may require two
additional drivers and one receiver if designing
for a DTE (one driver and two receivers for a
DCE).
The
SP522
and
SP524
is a convenient solution
in a design that requires two extra single ended
or differential transceivers. The SP504 and
SP522
, shown in
Figure 15,
can be programmed
in various configurations. The SP504 is
programmed for RS-449 mode. By connecting
the decoder pins of the SP504 to the DP0 and
DP1 pins accordingly, the SP522 is programmed
in RS-423 mode. This adds two single ended
transceivers to the application. For applications
needing more than five RS-422 transceivers or
more than three RS-423 transceivers, the SP504
can be programmed to RS-422 whereas a SP524
can be added and programmed to RS-423, thus
creating seven RS-422 channels and four
RS-423 channels. The SP504 and the
SP522/
SP524
can be configured to custom fit the
various serial port application needs.
+5V Only Operation Using the SP782
The
SP522
and
SP524
use external +10V or
+5V voltage supplies for power to maintain the
RS-232 and RS-423 voltage levels, respectively.
However, if a low-cost +5V solution if pre-
ferred, the
SP522
and
SP524
can be configured
with the SP782 or SP784 programmable charge
pump. The
Sipex
patent-pending programmable
charge pumps offer +10V or +5V outputs. The
programmability is used for switching from
RS-232 using the +10V outputs to RS-423 using
the +5V outputs. The SP782 requires 0.1
μ
F
capacitors and the SP784 requires 10
μ
F capacitors
for the charge pump. Please refer to the SP782
and SP784 data sheet for details on the program-
mable charge pump.
Achieving +10V with +12V Supplies
Since the
SP522
and
SP524
use external +10V
supplies, systems that have +12V supplies must
be regulated down to +10V. This can be simply
configured by placing diodes in series with the
V
and V
lines. The absolute maximum
supply voltage is +12V. Since most +12V power
supplies have some voltage tolerances, usually
+10%, any increase above the 12V maximum
will damage the device. However, the +12V
supply may be used providing that the maximum
supply voltages do not exceed the rated absolute
maximum V
SS
and V
DD
.
Sequencing of Power Supplies
Power Supplies for the
SP522
and
SP524
must
be sequenced. The recommended sequence is
V
first, V
50-80
μ
Sec later and V
100 to
1,000
μ
Sec after V
. There are no sequencing
requirements for the
SP522
or
SP524
when they
are powered from either the
SP782
or
SP784
charge pump devices or from the V
and V
supply pins of the
SP504
or
SP505
charge pump
powered devices. For further details, see the
application note,
V
DD
, V
CC
and V
SS
Power
Supply Sequencing.
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