Vitek VT-1958 Schematic
U3
1
CS
CS
2
SK
SK
DI
3
DI
DO VSS
DO4GND
ATMEL93C46
VCC
TEST
8
7
NC
6
5
VDD
VDD
J_R
E+
1
S-
2
R5
10R
C5
104P
C3
1uF
PAD1 LCD_PAD
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SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
COM4
COM3
COM2
14
COM1
PAD1
W1
W4
S+
EPAD2
W2
W3
3
4
5
RIGHT
J_L
1
2
3
4
5
LEFT
REFO
AGND
C11
104P
C13
104P
REFI
AD1
AD4
VSS
COM2
COM4
COM3
VIN
OP1N
C8 27nF
C7
1uF
R24 22K
Q3
NPN C1815
OP1O
REFO
REFI
AD5
AD4
AD3
AD2
AD1
AD0
Q4
PNP A1015
R18
680K
R19
18K
AD2
R20
1.5K
AD0
R22
10K
R15 91K
R14
10K
R13
10K
R10 91K
C12
104P
R16
2M
C14
0.1uF
R21
1M
0.1uF
E+(VDD)
S+
SE-
BT1
Vbat
R17
510K
C6
10nF
VIN
1
VSS
2
D5
1N4001
C10
PAD1
AD3
AGND
PAD2
R12
100K
R9
100K
AD4
AD5
OP1N
OPIO
C9
R11 2.4K
R8 2.4K
104P
COM1
U4
47
48
VSS
49
OP1N
50
OP1O
51
REFO
52
REFI
53
FT2
54
FT1
55
AD7
56
AD6
57
AD5
58
AD4
59
AD3
60
AD2
61
AD1
62
AD0
63
VB
64
AGND
P1.01P1.12P1.23P1.34P1.45P1.56P1.67P1.78P2.09P2.110P2.211P2.312P2.413P2.514P2.615P2.7
R25
10K
COM444COM345COM246COM1
FS9912
PT1.4
PT1.2
D4
IN4148
D2
IN4148
R26 47K
43
DO
SK
DI
PT1.5
lb
kg
S5 MODE KEY
S3 UP KEY
S2 DOWN KEY
PT1.4
SEG9
SEG8
SEG10
36
SEG1037SEG1138SEG1239SEG1340SEG1441SEG1542SEG16
CS
S4 ON/OFF
S1 SET KEY
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
RLCD
VDDA
WDTEN
XOUT
16
SEG633SEG734SEG835SEG9
VGG
VDD
R3
22K
R2 R 47K
VDD
VDD
R6
100K
Q2
PNP A1015
R1
10K
Q1
NPN C1815
C2
0.1uF
C4 2.2nF
BKL IC
ELV+ EL1
GND
U1
U2 APL5301
VIN2VOUT
GND
1
BKL_1
EL2
BKL_2
3
VDD
R4
10K
C1
1uF
VSS
D3
IN4148
D1
IN4148
Y1
4MHz
VDD
R23 100K
R7
1M
PT1.5
PT1.2
SEG5
32
SEG4
31
SEG3
30
SEG2
29
SEG1
28
27
26
25
24
CA
23
CB
22
21
RST
20
TST
19
18
17
XIN
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