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LTC2870 PDF预览

LTC2870

更新时间： 2024-11-05 11:45:59
品牌 Logo 应用领域
Linear Systems /
页数 文件大小 规格书
28页 441K
描述
RS232/RS485 Dual Multiprotocol Transceiver with Integrated Termination

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中文翻译

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LTC2870 数据手册

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LTC2872  
RS232/RS485 Dual  
Multiprotocol Transceiver  
with Integrated Termination  
FeaTures  
DescripTion  
The LTC®2872 is a robust pin-configurable transceiver  
that supports RS232, RS485, and RS422 standards while  
operating on a single 3V to 5.5V supply. The LTC2872 can  
be configured as four RS232 single-ended transceivers  
or two RS485 differential transceivers, or combinations  
of both, on shared I/O lines.  
n
Four RS232 and Two RS485 Transceivers  
n
3V to 5.5V Supply Voltage  
n
20Mbps RS485 and 500kbps RS232  
n
Automatic Selection of Integrated RS485 (120Ω)  
and RS232 (5kΩ) Termination Resistors  
n
Half-/Full-Duplex RS485 Switching  
n
Logic Loopback Mode  
Pin-controlled integrated termination resistors allow  
for easy interface reconfiguration, eliminating external  
resistors and control relays. Half-duplex switches allow  
four-wire and two-wire RS485 configurations. Loopback  
mode steers the driver inputs to the receiver outputs for  
diagnostic self-test. The RS485 receivers support up to  
256 nodes per bus, and feature full failsafe operation for  
floating, shorted or terminated inputs.  
n
High ESD: ±±6kV on Line I/O  
n
±.7V to 5.5V Logic Interface  
n
Supports Up to 256 RS485 Nodes  
n
RS485 Receiver Full Failsafe Eliminates UART Lockup  
n
Available in 38-Pin 5mm × 7mm QFN Package  
applicaTions  
n
Flexible RS232/RS485/RS422 Interface  
n
An integrated DC/DC boost converter uses a small induc-  
tor and one capacitor, eliminating the need for multiple  
supplies for driving RS232 levels.  
Software Selectable Multiprotocol Interface Ports  
n
Point-of-Sale Terminals  
n
Cable Repeaters  
n
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of  
Linear Technology Corporation. All other trademarks are the property of their respective owners.  
Protocol Translators  
n
PROFIBUS-DP Networks  
Typical applicaTions  
RS485 Mode with Duplex Control  
RS232 Mode  
Mixed Mode with RS485 Termination  
1.7V TO V  
3V TO 5.5V  
22µH  
1.7V TO V  
3V TO 5.5V  
22µH  
1.7V TO V  
CC  
3V TO 5.5V  
22µH  
CC  
CC  
470nF  
470nF  
470nF  
2.2µF  
2.2µF  
2.2µF  
2.2µF  
2.2µF  
2.2µF  
V
CAP  
SW  
LTC2872  
V
V
CAP  
SW  
LTC2872  
V
V
CAP  
SW  
LTC2872  
V
CC  
L
CC  
L
CC  
L
RS485  
FULL HALF  
DUPLEX  
RS485  
OFF ON  
H/F  
TE485-1  
DY1  
Y1  
DY1  
Y1  
Y1  
TERMINATION  
DY1  
120Ω  
120Ω  
Z1  
Z1  
A1  
DZ1  
RA1  
Z1  
A1  
RA1  
DY2  
A1  
B1  
RA1  
DY2  
B1  
Y2  
RB1  
DY2  
B1  
Y2  
Y2  
Z2  
DZ2  
RA2  
DZ2  
RA2  
Z2  
A2  
Z2  
A2  
A2  
B2  
RA2  
B2  
B2  
EE  
RB2  
RB2  
V
V
V
DD  
V
V
DD  
V
DD  
EE  
EE  
2.2µF  
2.2µF  
2.2µF  
2.2µF  
2.2µF  
2.2µF  
2872f  
2872 TA01  
1
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