AN2281 datasheet(13/38 Pages) STMICROELECTRONICS

13 / 38 page

AN2281

Application schematics

13/38

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

VBUS

+5V

U5-PMOS G

U5-NMOS G

U3-NMOS 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-NMOS G

U5-NMOS S

U4-PMOS G

U3-NMOS S

U3-PMOS S

U4-PMOS G

U4-NMOS G

U4-NMOS S

0.01uF

R29

3.3K

1uF

POT2 - 10K

1uF

D2 1N4148

D5 1N4148

BC817

BC807

R30

R12

JP3

HEADER 6

POT1 - 10K

CON1

JP2

ICC Connector

910

R23

4.7K

ST7LITE35

VSS

VDD

RESET

PB0

PB1

PB2

PB3

PB4

PB5/AIN5

PB6/AIN6

OSC2

OSC1

PA7

ICCCLK

ATPWM2

ICCDATA

ATPWM1

ATPWM0

PA1

LTIC2

BC817

R17

D3 1N4148

BC807

R18

R24

4.7K

R13

3.3K

R14

C14

100K

D6 1N4148

R32

R31

3.3K

R11

3.3K

4.7K

78L05B

Vin

GND1

GND2

NC1

GND4

GND3

Vout

10nF

C13

BC817

D4 1N4148

R25

4.7K

100n

BC807

R19

R15

3.3K

100K

R16

C15

R33

3.3K

D7 1N4148

R34

SW1

STS8C5H30L-SO8

d2a

d1a

C12

1.5n

C10

1.5n

STS8C5H30L-SO8

d2a

d1a

C16

100nF

LED

STS8C5H30L-SO8

d2a

d1a

C11

1.5n

JP1

Supply Voltage

R10

100K

ICCCLK

ICCDATA

RESET

Hall sensor output

RESET

Hall sensor output

ICCCLK

ICCDATA

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