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ManualsBrandsLINEAR TECHNOLOGY ManualsInterface ICsInterface IC - transceivers Multi protocol 2/2 QFN 28
21222324252627282930
LTC2870/LTC2871
30
28701fb
For more information www.linear.com/LTC2870
Logic input pins not shown are tied to a valid logic state. External Components not shown.
Typical applicaTions
Figure39. LTC2870: Making Use of Shared I/O for Various Communication Configurations
Figure40. LTC2870: Using External Connections for Half-Duplex RS232 or RS485 Operation
28701 F38
LTC2870
1.7V TO V
CC
3V TO 5.5V
485/232
RXEN
DXEN
TE485
H/F
DY
Y
Z
A
B
DZ
RA
RB
V
L
V
L
CONTROLLER
CONNECTOR
V
CC
GND
RS485
RS485
FULL-DUPLEX
485/232 = 1
H/F = 0
RS485
HALF-DUPLEX
485/232 = 1
H/F = 1
RS232
FULL-DUPLEX
485/232 = 0
H/F = X
RS485
RS485
RS485
RS485
RS485
RS232
RS232
RS232
RS232
28701 F39
LTC2870
1.7V TO V
CC
3V TO 5.5V
485/232
RXEN
DXEN
H/F
DY
Y
Z
A
B
DZ
RA
RB
V
L
V
L
CONTROLLER
CONNECTOR
V
CC
TE485
GND
RS485
RS485
HALF-DUPLEX
485/232 = 1
H/F = 0
RS232
HALF-DUPLEX
485/232 = 0
H/F = X
RS485
RS232
RS232
NOTE: THIS CONFIGURATION IS NOT COMPATIBLE
WITH INTERNAL RS485 TERMINATION.
SETTING TE485 HIGH WILL RESULT IN DOUBLE
TERMINATION IN RS485 MODE.
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