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| 型号： | DC1786A |
| 厂商： | Linear Technology |
| 文件页数： | 1/36页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO LTC2871 |
| 设计资源： | DC1786A Design Files DC1786A Schematic |
| 标准包装： | 1 |
| 主要目的： | 接口，收发器，RS-232/RS-485 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LTC2871 |
| 主要属性： | 3 个驱动器，3 个接收器 |
| 次要属性： | 3 V ~ 5.5 V 电源 |
| 已供物品： | 板 |
| 相关产品： | LTC2871CUHF#PBF-ND - IC TXRX RS485/RS422 38-QFN LTC2871IUHF#PBF-ND - IC TXRX RS485/RS422 38-QFN LTC2871CFE#PBF-ND - IC TXRX RS485/RS422 38-TSSOP LTC2871IFE#PBF-ND - IC TXRX RS485/RS422 38-TSSOP LTC2871CUHF#TRPBF-ND - IC TXRX RS485/RS422 38-QFN LTC2871IFE#TRPBF-ND - IC TXRX RS485/RS422 38-TSSOP LTC2871IUHF#TRPBF-ND - IC TXRX RS485/RS422 38-QFN LTC2871CFE#TRPBF-ND - IC TXRX RS485/RS422 38-TSSOP |
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LTC2870/LTC2871
1
28701f
TYPICAL APPLICATIONS
DESCRIPTION
RS232/RS485 Multiprotocol
Transceivers with
Integrated Termination
The LTC2870/LTC2871 are robust pin-configurable mul-
tiprotocol transceivers, supporting RS232, RS485, and
RS422 protocols, operating on a single 3V to 5.5V supply.
The LTC2870 can be configured as two RS232 single-ended
transceivers or one RS485 differential transceiver on shared
I/O lines. The LTC2871 offers independent control of two
RS232 transceivers and one RS485 transceiver, each on
dedicated 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 and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protocol Switching with
Automatic Termination Selection
FEATURES
APPLICATIONS
n One RS485 and Two RS232 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 High ESD: ±26kV (LTC2870), ±16kV (LTC2871)
n Logic Loopback Mode
n 1.7V to 5.5V Logic Interface
n Supports Up to 256 RS485 Nodes
n RS485 Receiver Failsafe Eliminates UART Lockup
n Available in 28-Pin 4mm × 5mm QFN and
TSSOP (LTC2870), and 38-Pin 5mm × 7mm QFN
and TSSOP (LTC2871)
n Flexible RS232/RS485/RS422 Interface
n Software Selectable Multiprotocol Interface Ports
n Point-of-Sale Terminals
n Cable Repeaters
n Protocol Translators
Simultaneous Protocols and
RS485 Termination Switching
RS485 Duplex Switching
28701 TA01
LTC2870
1.7V TO VCC
3V TO 5.5V
1.7V TO VCC
3V TO 5.5V
1.7V TO VCC
3V TO 5.5V
RS485
TERMINATION
RS485
DUPLEX
485/232
DY
Y
Z
A
B
DZ
RA
RB
Y
Z
A
B
DI
VL
TE485
RO
DIN1
ROUT2
DIN2
ROUT1
VCC
VL
VCC
DOUT1
RIN2
DOUT2
RIN1
LTC2871
120Ω
Y
VCC
Z
A
B
DI,
DY
RO,
RB
H/F
LTC2870,
LTC2871
HALF
FULL
RS485
RS232
ON
OFF
VL
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