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21
Figure 9 Core part of ZLAN3003S Schematic Diagram
1) Pins extract for 3003S: CTS, LINK, 485_TEN, RTS, nRST, TXD, RXD and DEF.
All these pins are directly extracted from the 1003 chip.
2) The power input can be 5V or 3.3V. From the power supply circuit, 5V input was
reduced to 3.3V through 1117-3.3 chip, and 3.3v to 1.8v through 1117-1.8. It
should note that if the voltage is 9V, 12V, 24V and so on, please use the power
plan of SNMP card instead of the LDO chip of 1117. Because of the dual power
supply in this design, 1.8V is generated externally, so the VCC33I and VCC18O
of the chip both connect with 1.8V power supply.
3) Since the high speed UART is not used here, pull up the CONFIG pin, and let
RXD2 and TXD2 hang on.
4) It is important to note that RSH1 and RSL2 can only be welded one when
1
2
3
4
5
6
7
J3
C ON7
VCC 50
VCC 33
GND
nR ST
TXD
R XD
DEF
4
3
2
1
J4
C ON4
LINK
48 5_TEN
C TS
R TS
C 03
0.1u
VCC 33
C 02
TAJB 476 K1 01 R NJ
VCC 50
R 203
0
R 201
4.7K
D92
R UN_LED
ADJ
1
VIN
3
VOUT
2
U3
LM1 117 -3 .3
ADJ
1
VIN
3
VOUT
2
U4
LM1 117 -1 .8
VCC 18
C 04
TAJB 476 K1 01 R NJ
C 01
0.1u
ZLSN3003S out put/in put pins
RUN_LED
VCC1 8
CTS
CTS
nRST
VCC18
VCC33
TXD
RUN_LED
PULL_UP1
RXD
RTS
CONFIG
SPEED
PULL_DOWN5
PULL_DOWN4
SPEED
PULL_UP2
PULL_DOWN1
PULL_DOWN2
PULL_DOWN3
SPEED
CONFIG
NET_RX+
NET_RX-
NET_TX+
NET_TX-
LINK
ACT
DEF
485_EN
PULL_UP2
PULL_UP1
RP 10K
R2
1M
R1 12.1k
C1 33p
VCC
4
RESET
2
MR
3
GND
1
U1
max811reus
10 0M_LINK
61
R TS
62
GND
63
PULL_U P
64
R XD0
65
VCC 18
66
TXD 0
67
R XD1
68
VCC 33
76
VCC 18
75
nR ST
74
C TS2
73
SDA
72
SC L
71
NC
70
TXD 1
69
NC
80
NC
79
GND
78
NC
77
NC
1
NC
2
NC
3
VCC18
4
NC
5
NC
6
NC
7
NC
8
RXD2
9
TXD2
10
NC
11
NC
12
VCC33
13
RUN_LED
14
VCC18
15
CTS
16
GND
17
NC
18
NC
19
NC
20
GND
40
XTL+
39
XTL-
38
VCC 18
37
VC1 8
36
VCC 33
35
GND
34
C ONFIG
33
SP D1
32
PULL_D OW N
31
TEST_ DO W N
30
VCC 33
29
PULL-DO W N
28
PULL_D OW N
27
SP D0
26
PULL_U P
25
PULL_D OW N
24
VCC 18
23
NC
22
NC
21
485_T
60
VCC33
59
NC
58
NC
57
VCC18
56
DEF
55
ACT
54
LINK
53
VCC18O
52
VCC33I
51
GND
50
GND
49
TX-
48
TX+
47
VCC18
46
RX-
45
RX+
44
GND
43
VCC33
42
BG_RES
41
U2
ZLAN1003
X1
25M
RSL1 10K
R5 4.7K
C2 33p
R4 4.7K
RSL2 10K
R3 10K
RSH1 10K
VCC 18 VCC 33
VCC 18
VCC 18
VCC 33
VCC 18
VCC 33
VCC 33
VCC 33
VCC 18VCC 33
VCC 33
VCC 33
VCC 18 VCC 18
S e l e c t: RS L 2 t o u s e lo w s p e e d
VCC 18
S e l e c t: RS H 1 t o u s e hi g h s p e e d
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