參數資料
型號: LTC2871IUHF#PBF
廠商: Linear Technology
文件頁數: 10/36頁
文件大?。?/td> 0K
描述: IC TXRX RS485/RS422 38-QFN
產品培訓模塊: LTC2870 and LTC2871 Multi-Protocol Transceivers
標準包裝: 52
類型: 收發(fā)器
驅動器/接收器數: 3/3
規(guī)程: RS232,RS422,RS485
電源電壓: 3 V ~ 5.5 V
安裝類型: 表面貼裝
封裝/外殼: 38-WFQFN 裸露焊盤
供應商設備封裝: 38-QFN(5x7)
包裝: 管件
配用: DC1786A-ND - BOARD DEMO LTC2871
LTC2870/LTC2871
18
28701f
FUNCTION TABLES
Table 5. LTC2871 CH2 CONTROL
CH2
DX232
RX232
RS232 RECEIVER INPUTS
RS232 DRIVER OUTPUTS
COMMENTS
RIN1
RIN2
DOUT1
DOUT2
X
0
1
Hi-Z
Both Drivers and Receivers Disabled
0
5kΩ
Hi-Z
Both Receivers Enabled, Both Drivers Disabled
0
1
Hi-Z
Driven
Both Receivers Disabled, Both Drivers Enabled
0
1
0
5kΩ
Driven
Both Receivers and Drivers Enabled
1
0
5kΩ
Hi-Z
Channel 2 Drivers and Receivers Disabled
1
Hi-Z
Driven
Hi-Z
Channel 2 Drivers and Receivers Disabled
1
0
5kΩ
Hi-Z
Driven
Hi-Z
Channel 2 Drivers and Receivers Disabled
Table 6. RS485 Driver Mode (TE485 = 0)
DX485 OR DXEN
DI
CONDITIONS
Y
Z
0
X
No Fault
125kΩ
1
0
No Fault
0
1
No Fault
1
0
X
Thermal Fault
125kΩ
Table 7. RS485 Receiver Mode (LB = 0)
RXEN OR RX485
A - B (NOTE 5)
CONDITIONS
RA, RO
1
X
No Fault
Hi-Z
0
< –200mV
No Fault
0
> 200mV
No Fault
1
0
Inputs Open or Shorted Together (DC)
Failsafe
1
X
Thermal Fault
Hi-Z
Table 8. RS485 Termination (485/232 = 1 for LTC2870)
TE485
H/F, LB
CONDITIONS
R (A TO B)
R (Y TO Z)
0
X
No Fault
Hi-Z
1
X
No Fault
120Ω
X
Thermal Fault
Hi-Z
Table 9. RS485 Duplex Control (485/232 = 1 for LTC2870)
H/F
RS485 DRIVER OUTPUTS
RS485 RECEIVER INPUTS
0
Y, Z
A, B
1
Y, Z
Table 10. LTC2870 Loopback Functions
LB
RXEN
MODE
0
X
Not Loopback
X
1
Not Loopback
1
0
Loopback (RA = DY, RB = DZ)
Table 11. LTC2871 Loopback Functions
LB
RX232
RX485
MODE
0
X
Not Loopback
X
1
Not Loopback
1
0
1
Loopback RS232 (ROUT1 = DIN1, ROUT2 = DIN2)
1
0
Loopback RS485 (R0 = DI)
1
0
Loopback All (ROUT1 = DIN1, ROUT2 = DIN2, RO = DI)
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