UM0527
Technical description
39/66
Figure 19.
PC interface stage
COM
C
103
22uF/
35V
V+
COM
R
121
2.
2k
C
109
2.
2uF/
50V
TRI
G
2
Q
3
R
4
CVo
lt
5
THR
6
DI
S
7
VCC
8
GND
1
U1
4
TS555C
D
T
COM
C2
5 100nF
C2
3
100nF
C5
10uF/35V
C2
2
100nF
R9
7
10k
R4
1
4.
7k
V-
D1
8
BAS1
6
COM
COM
VPC
VPC
OFF
OFF
1
6
2
7
3
8
4
9
5
J14
U
2
1
P
C
817C
U1
9
PC
817C
U2
0
PC
817C
D1
9
BAS1
6
R4
5
4.
7k
R
148
2.
4k
R
147
820R
BTL
ACFL
OFF
R
146
4.
7k
R
145
4.
7k
R4
8
4.
7k
U2
2
PC
817C
U2
3
PC
817C
R
112
100R
R9
9
20k
R
144
2.
2k
R
149
6.
8k
D2
0
BAS1
6
R
142
3.
3k
V-
V+
TXD1
RXD1
COM
VCC
VCC
GND
VCC
COM
COM
COM
V+
V+
VCC
COM
VPC
BAT_LOW
ACF1
!
UPS_OFF!
RXD
TXD
Q1
3
B
C
846B
Q1
4
B
C
857B
GND
ACF1
!
BAT_LOW
UPS_OFF!
RXD
TXD
GND
Tx
D_
USB
GND1
GND1
C9
2
22pF
C9
1
22pF
Y2
24M
H
z
USBDM
GND1
1
2
3
4
J13
USB-
B
GND1
C2
4
100nF
R4
3
4.
7k
GND1
Tx
D_
USB
USB
Rx
D_
USB
OSCOUT
OSCI
N
RST_
USB
USBDP
USBVCC
+
5
V_
USB
OSCOUT
OSCI
N
+
5
V_
USB
USBDM
USBDP
ICCCLK
ICCDATA
VPP_USB
C6
10uF/
35V
ICCDATA
ICCCLK
RST_
USB
VPP_USB
GND1
+
5
V_
USB
ICCDATA
ICCCLK
R9
8
10k
VPP_USB
GND1
USBVCC
R
141
1.
5k
USB
S
ocket
C5
7
100pF
C5
8
100pF
C8
0
10nF
GND1
RST_
USB
Rx
D_
USB
IC
P
RXD1
TXD1
ACFL
BTL
OFF
U1
7
PC
817C
U1
8
PC
817C
R4
4
4.
7k
R
143
4.
3k
+
5
V_
USB
GND1
GND
R4
7
4.
7k
VCC
U
1
6
P
C
817C
R4
2
4.
7k
GND1
+
5
V_
USB
R4
6
4.
7k
GND
VCC
GND
GND
+
5
V_
USB
IN
H
6
ADDR
A
11
ADDR
C
9
A1
12
A2
13
B1
2
B2
1
C1
5
C2
3
C
4
A
14
B
15
VCC
16
VSS
8
ADDR
B
10
VEE
7
U2
4
M
74H
C
4053R
M
13TR
VCC
USB_
IN
!
GND1
GND1
D4
0
B
A
T54S
D3
9
B
A
T54C
D4
1
B
A
T54A
Vc
c1
1
Vc
c2
8
Ou
t1
7
In
1
2
In
2
3
G
nd1
4
Ou
t2
6
G
nd2
5
U1
3
USB6
B1
D
ata
P
ro
tectio
n
C2
6
100nF
GND
C5
9
100pF
C6
0
100pF
GND1
GND1
C
106
100nF
GND1
+
5
V_
USB
GND1
GND1
VCC
1
3
5
7
2
4
6
8
9
10
J15
ID
C
1
0
120V
ac
M
odel
230V
ac
M
odel
USB_
IN
!
VCC
GND
GND
VCC
NC1
0
NC9
NC8
NC4
NC5
NC6
NC7
R
165
10k
GND1
R
166
10k
GND1
R
167
10k
GND1
R
168
10k
GND1
R
169
10k
GND1
R
170
10k
GND1
R
171
10k
GND1
NC1
0
NC9
NC8
NC4
NC5
NC6
NC7
VSS
4
USBDM
23
USBDP
22
RESET
7
OSCI
N
3
OSCOUT
2
PA7
14
PB6
8
PA5
15
PA4
16
PB3
10
PB2
11
PB1
12
PB0
13
VDD
1
PA1
19
PA0
20
USBVCC
24
VPP
9
PC0
6
VSSA
21
PC1
5
PA3
17
PA2
18
U1
5
ST72F63B
E2M
1
SO
24
GND1
NC1
1
NC1
2
NC1
3
R8
5
10k
GND1
R8
4
10k
GND1
R4
0
10k
GND1
NC1
1
NC1
2
NC1
3