Cadence OrCAD PCB Designer
Cadence OrCAD PCB Designer
Cadence OrCAD PCB Designer
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SCLK<br />
nSS<br />
MISO<br />
MISO<br />
SCLK<br />
nSS<br />
PTE6 PTE7<br />
PTE6 PTE7<br />
VCC<br />
VCC<br />
VCC<br />
VCC<br />
VCC V+<br />
R7<br />
100k<br />
R7<br />
100k<br />
U1D<br />
LM324<br />
U1D<br />
LM324<br />
+<br />
12<br />
-<br />
13<br />
V+<br />
4<br />
V-<br />
11<br />
OUT<br />
14<br />
R8<br />
47k<br />
R8<br />
47k<br />
R9<br />
10k<br />
R9<br />
10k<br />
R10<br />
10k<br />
SET = 0.5<br />
R10<br />
10k<br />
SET = 0.5<br />
J1<br />
Sensor<br />
J1<br />
Sensor<br />
1<br />
2<br />
3<br />
4<br />
C1<br />
100n<br />
C1<br />
100n<br />
U1B<br />
LM324<br />
U1B<br />
LM324<br />
+<br />
5<br />
-<br />
6<br />
V+<br />
4<br />
V-<br />
11<br />
OUT<br />
7<br />
C2<br />
100n<br />
C2<br />
100n<br />
SW1<br />
Tare<br />
SW1<br />
Tare<br />
R1<br />
100k<br />
R1<br />
100k<br />
C3<br />
10u<br />
16V<br />
C3<br />
10u<br />
16V<br />
U1C<br />
LM324<br />
U1C<br />
LM324<br />
+<br />
10<br />
-<br />
9<br />
V+<br />
4<br />
V-<br />
11<br />
OUT<br />
8<br />
R2<br />
4.7k<br />
R2<br />
4.7k<br />
SW2<br />
Calibrate<br />
SW2<br />
Calibrate<br />
R3<br />
100k<br />
R3<br />
100k<br />
J2<br />
Softec<br />
J2<br />
Softec<br />
2<br />
4<br />
6<br />
8<br />
10<br />
12<br />
14<br />
16<br />
1<br />
3<br />
5<br />
7<br />
9<br />
11<br />
13<br />
15<br />
U2<br />
TLC549<br />
U2<br />
TLC549<br />
AIN<br />
2<br />
I/OCLK<br />
7<br />
REF+<br />
1<br />
REF-<br />
3<br />
DOUT<br />
6<br />
CS<br />
5<br />
U1A<br />
LM324<br />
U1A<br />
LM324<br />
+<br />
3<br />
-<br />
2<br />
V+<br />
4<br />
V-<br />
11<br />
OUT<br />
1<br />
R4<br />
100k<br />
R4<br />
100k<br />
R5<br />
100k<br />
R5<br />
100k<br />
R11<br />
4.7k<br />
R11<br />
4.7k<br />
R6<br />
100k<br />
R6<br />
100k<br />
Figure 22. Instrumentation amplifier and analogue-to-digital converter for an electronic weight scale.<br />
42