LTC2803 LINER [Linear Technology], LTC2803 Datasheet - Page 15

• Manufacturer Part Number: LTC2803
• Description: Multiprotocol Transceiver
• Manufacturer: LINER [Linear Technology]

FuncTion Tables
Table 1. Shutdown and Fast Enable Modes
Table 2. Mode Selection Table for a Given Port (FEX = X)
Table 3. RS232 Receiver Mode for a Given Port (485/232 = 0)
Table 4. RS232 Driver Mode for a Given Port (485/232 = 0)
FEN
485/232
0
1
DXENX
RXEN
0
0
1
1
1
1
1
1
0
1
0
0
0
0
1
1
X
485/232_1 AND
485/232_2
RXEN
X
X
X
0
X
0
X
X
X
0
0
RECEIVER INPUT (A, B)
DRIVER INPUT (DY, DZ)
RXEN1 AND
DXEN
X
X
X
X
X
X
X
1
1
X
X
RXEN2
0
1
X
0
1
X
1
1
TE485
X
X
X
X
1
X
X
X
X
DXEN1 AND
DXEN2
0
0
H/F
Thermal Fault
X
X
X
X
X
X
X
CONDITIONS
Thermal Fault
0
1
CONDITIONS
No Fault
No Fault
No Fault
No Fault
No Fault
No Fault
TE485_1 AND
TE485_2
LB
0
0
0
0
0
0
X
0
0
1
1
DC/DC CONVERTER
RECEIVER OUTPUTS (RA, RB)
H/F
DRIVER OUTPUT (Y, Z)
X
X
ON
ON
ON
ON
ON
ON
ON
X
X
125kΩ
125kΩ
LB
X
X
1
0
Hi-Z
Hi-Z
1
0
CONVERTER MODE AND COMMENTS
DC/DC
MODE AND COMMENTS
RS232 Drivers On
RS232 Receivers On
RS485 Driver On
RS485 Receiver On
RS485 Termination Mode (See Table 7)
RS485 Full Duplex Mode
RS485 Half Duplex Mode
RS485 Loopback Mode
RS232 Loopback Mode
OFF
ON
Shutdown: All Main Functions Off
Fast-Enable: DC/DC Converter On Only
RECEIVER INPUTS (A, B)
125kΩ
5kΩ
5kΩ
5kΩ
LTC2872
15
2872f