1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D D
C C
B B
A A
Title
Number RevisionSize
A3
Date: 2021/8/11 Sheet of
File: E:\电路城（51单片机）\..\Sheet1.SchDocDrawn By:
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
RST
9
P3.0/RXD
10
P3.1/TXD
11
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.5/T1
15
P3.6/WR
16
P3.7/RD
17
XTAL2
18
XTAL1
19
GND
20
P2.0
21
P2.1
22
P2.2
23
P2.3
24
P2.4
25
P2.5
26
P2.6
27
P2.7
28
PSEN
29
ALE/PROG
30
EA
31
P0.7
32
P0.6
33
P0.5
34
P0.4
35
P0.3
36
P0.2
37
P0.1
38
P0.0
39
VCC
40
U1
80511 2
Y1
XTAL
30pF
C2
Cap
10uF
C1
Cap Pol1
30pF
C3
Cap
10K
R1
Res2
GND
VCC
15
A
14
D7
13
D6
12
D5
11
D4
10
D3
9
D2
8
D1
7
D0
6
E
5
RW
4
RS
3
V0
2
VCC
1
GND
16
K
LCD1602
LCD1
1
2
3
4
5
6
7
8
9
RP1
RESP
S1
SW-PB
GND
S2
SW-PB
S3
SW-PB
S4
SW-PB
P30
P31
P32
P33
P34
P35
P36
P37
P10
P11
P12
P13
P14
P15
P16
P17
Vin Vout
GND
7805
Volt Reg
0.1uF
C5
Cap
100uF
C4
Cap Pol1
0.1uF
C7
Cap
100uF
C6
Cap Pol1
1
2
P1
电源接口
GND
VCC
GND
P10
P11
P12
AIN0
1
AIN1
2
AIN2
3
A0
5
SDA
9
SCL
10
AIN3
4
AOUT
15
VREF
14
EXT
12
A2
7
A1
6
AGND
13
OSC
11
U2
PCF8591
GND
VCC
1
2
P2
传感器接口
GND
2
3
6
4 7
1
8
5
U3
Op Amp
+5V
20K
R6
Res2
-5V
20K
R5
Res2
10K
R7
Res2
GND
-5V
2
3
6
4 7
1
8
5
U4
Op Amp
+5V
10K
R4
Res2
-5V
10K
R3
Res2
GND
U5
Optoisolator1
1
2
P3
加热器接口
GND
VCC
100
R2
Res2
