Manualsbrain.com
  1. Manuali
  2. Marche
  3. Linear Technology
  4. LTC2872 RS232/RS485 Dual Multiprotocol Transceiver with Integrated Termination DC1851A
  5. Scheda Tecnica

Linear Technology LTC2872 RS232/RS485 Dual Multiprotocol Transceiver with Integrated Termination DC1851A DC1851A Scheda Tecnica

Codici prodotto
DC1851A
Scarica
Pagina di 28
LTC2872
1
2872f
Typical applicaTions
DescripTion
RS232/RS485 Dual  
Multiprotocol Transceiver
with Integrated Termination
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.  
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.
An integrated DC/DC boost converter uses a small induc-
tor and one capacitor, eliminating the need for multiple 
supplies for driving RS232 levels.
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.
RS485 Mode with Duplex Control
FeaTures
applicaTions
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
n
  High ESD: ±16kV on Line I/O
n
  1.7V 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
n
  Flexible RS232/RS485/RS422 Interface
n
  Software Selectable Multiprotocol Interface Ports
n
  Point-of-Sale Terminals
n
  Cable Repeaters
n
  Protocol Translators
n
  PROFIBUS-DP Networks
RS232 Mode
Mixed Mode with RS485 Termination
2872 TA01
LTC2872
3V TO 5.5V
1.7V TO V
CC
RS485
TERMINATION
H/F
DY1
2.2µF
Y1
Z1
A2
B2
A1
B1
RA1
DY2
RA2
V
DD
V
EE
DY1
DY2
RB2
RA2
DZ2
RB1
RA1
DZ1
Y1
B2
A2
Z1
Y2
Z2
A1
B1
LTC2872
DY2
RB2
RA2
DZ2
B2
A2
Y2
Z2
Y1
Z1
DY1
TE485-1
LTC2872
120Ω
ON
OFF
RS485
DUPLEX
HALF
FULL
Y2
Z2
A1
B1
RA1
120Ω
V
L
V
CC
CAP
470nF
22µH
2.2µF
2.2µF
2.2µF
2.2µF
2.2µF
2.2µF
2.2µF
2.2µF
2.2µF
SW
3V TO 5.5V
1.7V TO V
CC
2.2µF
V
DD
V
EE
V
L
V
CC
CAP
470nF
22µH
SW
3V TO 5.5V
1.7V TO V
CC
2.2µF
V
DD
V
EE
V
L
V
CC
CAP
470nF
22µH
SW