Datasheet

LTC2872
10
2872f
block DiagraM
2872 BD
CONTROL
LOGIC
DRIVERS
TRANSCEIVER #1
RECEIVERS
LOOPBACK
PATH
0.1µF
DXEN
RXEN1
TE485_1
H/F
485/232_1
DXEN2
DY2
DZ2
RA2
RB2
RXEN2
TE485_2
485/232_2
FEN
LB
DY1
DZ1
RA1
RB1
GND
B1
Y2
Z2
A2
B2
A1
PORT 1
PORT 2
Z1
Y1
V
EE
V
DD
GND
V
CC
GND
1.7V TO 5.5V
(≤ V
CC
)
PULSE-SKIPPING
BOOST REGULATOR
f = 1.2MHz
RT232
RT485
2.2µF
22µH
470nF
3V TO 5.5V
2.2µF
2.2µF
CAP
SWV
CC
V
L
232
485
232
232
485
232
5k
RT232
RT485
125k
5k
125k
125k
120Ω
RT485
120Ω
H/F
125k
TRANSCEIVER #2
35 21 19 17
20
39
18
4
1
5
6
2
3
28
V
CC
GND
31
27
26
30
29
34
32
33
24
25
14
12
23
22
38
37
8
7
13
11
9
10
15
36
16