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AN2281 Datasheet(PDF) 13 Page - STMicroelectronics

Part # AN2281
Description  Low cost self-synchronizing PMAC motor drive using ST7FLITE35
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2281 Datasheet(HTML) 13 Page - STMicroelectronics

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AN2281
Application schematics
13/38
4
Application schematics
Figure 10 shows the application schematic:
Figure 10. Proposed reference schematic
As you can see in Figure 10, the proposed schematic has a logic section basically
consisting of the ST7FLITE35 microcontroller, and a power section including the three-
phase inverter.
The power supply is consists only of an L7805 voltage regulator. The simplicity of this type
of solution limits the minimum operating voltage to almost 7V but you could obtain a lower
value by using a low drop voltage regulator (i.e. L4979D).
+5V
+5V
+5V
+5V
VBUS
VBUS
+5V
+5V
+5V
U5-PMOS G
U5-NMOS G
U5-NMOS G
U3-NMOS G
U3-PMOS G
U3-PMOS G
U5-PMOS G
U3-NMOS S
U5-PMOS S
U3-PMOS S
U5-NMOS S
U3-NMOS G
U5-PMOS S
U4-PMOS S
U4-PMOS S
U4-NMOS G
U5-NMOS S
U4-PMOS G
U3-NMOS S
U3-PMOS S
U4-PMOS G
U4-NMOS G
U4-NMOS S
U4-NMOS S
C3
0.01uF
R29
3.3K
C1
1uF
R4
POT2 - 10K
2
C2
1uF
D2 1N4148
D5 1N4148
Q7
BC817
3
2
1
Q1
BC817
3
2
1
Q4
BC807
3
2
1
R30
10
R12
10
JP3
HEADER 6
1
2
3
4
5
6
R3
POT1 - 10K
2
J4
CON1
1
J1
CON1
1
J2
CON1
1
J3
CON1
1
J5
CON1
1
J6
CON1
1
JP2
ICC Connector
12
34
56
78
910
R23
4.7K
U2
ST7LITE35
1
2
3
4
5
6
7
8
9
10
19
20
11
12
14
13
15
16
17
18
VSS
VDD
RESET
PB0
PB1
PB2
PB3
PB4
PB5/AIN5
PB6/AIN6
OSC2
OSC1
PA7
ICCCLK
ATPWM2
ICCDATA
ATPWM1
ATPWM0
PA1
LTIC2
Q8
BC817
3
2
1
Q2
BC817
3
2
1
R17
1K
D3 1N4148
Q5
BC807
3
2
1
R18
1K
R24
4.7K
R13
3.3K
C8
NC
R14
10
C14
NC
R9
100K
D6 1N4148
R32
10
R31
3.3K
R11
3.3K
R1
4.7K
U1
78L05B
8
2
3
4
5
6
7
1
Vin
GND1
GND2
NC1
NC
GND4
GND3
Vout
C7
C4
10nF
C13
NC
Q9
BC817
3
2
1
Q3
BC817
3
2
1
D4 1N4148
R25
4.7K
C5
100n
C6
100n
Q6
BC807
3
2
1
R19
1K
R15
3.3K
R7
100K
C9
NC
R16
10
C15
NC
R33
3.3K
D7 1N4148
R34
10
SW1
U3
STS8C5H30L-SO8
2
3
4
5
6
7
8
1
g1
s2
g2
d2
d2a
d1
d1a
s1
C12
1.5n
C10
1.5n
U5
STS8C5H30L-SO8
2
3
4
5
6
7
8
1
g1
s2
g2
d2
d2a
d1
d1a
s1
C16
100nF
R2
1K
D1
LED
U4
STS8C5H30L-SO8
2
3
4
5
6
7
8
1
g1
s2
g2
d2
d2a
d1
d1a
s1
C11
1.5n
JP1
Supply Voltage
1
2
R10
100K
V
U
C
A
B
ICCCLK
ICCDATA
C
RESET
A
B
Hall sensor output
RESET
Hall sensor output
ICCCLK
ICCDATA
W
U
V
W



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