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| LTC2870_15 Datasheet, PDF (29/42 Pages) Linear Technology – RS232/RS485 Multiprotocol Transceivers with Integrated Termination | |||
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LTC2870/LTC2871
typical Applications
VCC = 3V to 5.5V, VL = 1.7V to VCC. Logic input pins not shown are tied to a valid logic state. External Components not shown.
VL
VL
VL
D R 485
H/F
DX485
RX485
LTC2871
CH2
LB
TE485
DX232
DX485
H/F
LB
LTC2871
RX232
CH2
RX485
TE485
D R 485
DX232
H/F
DX485
RX485
LTC2871
RX232
CH2
LB
D R 232
DX232
RX232
DI
Y
DI
Z
Y
Y
Z
DI
120Ω
Z
RO
A
RO
RO
120Ω
DIN1
DOUT1
B
DIN1
DOUT1
DIN1
DOUT1
ROUT1
DIN2
RIN1
DOUT2
ROUT1
DIN2
RIN1
DOUT2
ROUT1
DIN2
RIN1
DOUT2
ROUT2
RIN2
ROUT2
RIN2
ROUT2
RIN2
GND
28701 F32
GND
28701 F33
GND
28701 F34
Figure 33. LTC2871 in RS485 and
RS232 Mode, Both Half-Duplex
VL
485/232
LTC2870/
LTC2871
H/F
TE485
LB
DI
DY
RS485
FULL HALF
H/F
DUPLEX
RO
RB
Y
120Ω
Z
A
120Ω
B
Figure 34. LTC2871 in RS485 and RS232
Mode, RS485 Half-Duplex, Loopback
1.7V TO VCC
3V TO 5.5V
LTC2870/
LTC2871
VCC
VL
CONTROL
SIGNALS
DY, DIN1
Y
µP
RA, ROUT1
A
DZ, DIN2
Z
RB, ROUT2
B
GND
28701 F36
Figure 35. LTC2871 in RS485
and RS232 Mode, RS485
Half-Duplex, Terminated
LTC2870/
LTC2871
RS232
28701 F37
DATA RATE CL
100kbps 5nF
500kbps 1nF
CL 3k
GND
28701 F35
Figure 36. RS485 Duplex Switching
Figure 37. Microprocessor Interface
For more information www.linear.com/LTC2870
Figure 38. Driving Larger
RS232 Loads
28701fa
29
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