參數(shù)資料
型號: DC1786A
廠商: Linear Technology
文件頁數(shù): 9/36頁
文件大小: 0K
描述: BOARD DEMO LTC2871
設(shè)計資源: DC1786A Design Files
DC1786A Schematic
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,收發(fā)器,RS-232/RS-485
嵌入式:
已用 IC / 零件: LTC2871
主要屬性: 3 個驅(qū)動器,3 個接收器
次要屬性: 3 V ~ 5.5 V 電源
已供物品:
相關(guān)產(chǎn)品: LTC2871CUHF#PBF-ND - IC TXRX RS485/RS422 38-QFN
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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
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LTC2871CFE#TRPBF-ND - IC TXRX RS485/RS422 38-TSSOP
LTC2870/LTC2871
17
28701f
FUNCTION TABLES
Table 1. LTC2870 Mode Selection Table
FEN
485/232
RXEN
DXEN
TE485
H/F
LB
DC/DC
CONVERTER MODE AND COMMENTS
0
X
1
0
X
OFF
Low Power Shutdown: All Main Functions Off
0
1
0
X
OFF
Low Power Shutdown: All Main Functions Off
1
X
1
0
X
ON
Fast-Enable: DC/DC Converter On Only
X
0
X
1
X
0
ON
RS232 Drivers On
X
0
X
0
ON
RS232 Receivers On
X
1
X
1
X
0
ON
RS485 Driver On
X
1
0
X
0
ON
RS485 Receiver On
X
1
X
1
X
ON
RS485 Driver and Receiver 120Ω Termination Enabled
X
1
X
0
X
RS485 Full-Duplex Mode
X
1
X
1
0
X
RS485 Half-Duplex Mode
X
1
0
X
1
ON
RS485 Loopback Mode
X
0
X
1
ON
RS232 Loopback Mode
Table 2. LTC2871 Mode Selection Table (CH2 = 0)
FEN
RX232
DX232
RX485
DX485
TE485
H/F
LB
DC/DC
CONVERTER MODE AND COMMENTS
0
1
0
1
0
X
OFF
Low Power Shutdown: All Main Functions Off
1
0
1
0
X
ON
Fast-Enable: DC/DC Converter On Only
X
1
X
0
ON
RS232 Drivers On
X
0
X
0
ON
RS232 Receivers On
X
1
X
0
ON
RS485 Driver On
X
0
X
0
ON
RS485 Receiver On
X
0
X
RS485 Full-Duplex Mode
X
1
0
X
RS485 Half-Duplex Mode
X
0
X
1
ON
RS485 Loopback Mode
X
0
X
1
ON
RS232 Loopback Mode
Table 3. RS232 Receiver Mode (485/232 = 0 for LTC2870, CH2 = 0 for LTC2871)
RX232 OR RXEN
RECEIVER INPUTS
(A, B, RIN1, RIN2)
CONDITIONS
RECEIVER OUTPUTS
(RA, RB, ROUT1, ROUT2)
LTC2870 RECEIVER INPUTS
(A, B)
LTC2871 RECEIVER INPUTS
(RIN1, RIN2)
1
X
No Fault
Hi-Z
125kΩ
Hi-Z
0
No Fault
1
5kΩ
0
1
No Fault
0
5kΩ
0
X
Thermal Fault
Hi-Z
5kΩ
Table 4. RS232 Driver Mode (485/232 = 0 for LTC2870, CH2 = 0 for LTC2871)
DX232 OR DXEN
DRIVER INPUTS
(DY, DZ, DIN1, DIN2)
CONDITIONS
LTC2870 DRIVER OUTPUTS
(Y, Z)
LTC2871 DRIVER OUTPUTS
(DOUT1, DOUT2)
0
X
No Fault
125kΩ
Hi-Z
1
0
No Fault
1
No Fault
0
X
Thermal Fault
125kΩ
Hi-Z
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