Datasheet > LTC2872

LTC2872

更新时间： 2023-12-20 18:45:13

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
28页	445K
描述
具集成型终端的 RS232 / RS485 双通道多协议收发器

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LTC2872 数据手册

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.

Four RS232 and Two RS485 Transceivers

3V to 5.5V Supply Voltage

20Mbps RS485 and 500kbps RS232

Automatic Selection of Integrated RS485 (120Ω)

and RS232 (5kΩ) Termination Resistors

Half-/Full-Duplex RS485 Switching

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.

High ESD: ±±6kV on Line I/O

±.7V to 5.5V Logic Interface

Supports Up to 256 RS485 Nodes

RS485 Receiver Full Failsafe Eliminates UART Lockup

Available in 38-Pin 5mm × 7mm QFN Package

applicaTions

Flexible RS232/RS485/RS422 Interface

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

Point-of-Sale Terminals

Cable Repeaters

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

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

3V TO 5.5V

22µH

470nF

2.2µF

CAP

LTC2872

CAP

LTC2872

CAP

LTC2872

RS485

FULL HALF

DUPLEX

RS485

OFF ON

H/F

TE485-1

DY1

TERMINATION

DY1

120Ω

DZ1

RA1

DY2

RA1

DY2

RB1

DY2

DZ2

RA2

DZ2

RA2

RB2

2.2µF

2872f

2872 TA01

12 3 4 5 6 7...28

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