SNC21085A

1-CH H.Q. Speech Controller

Ver1.1

April 28, 2009

10

8.2 Motor application

CGND

CGND

CGND

CGND

+

M

M

M

M

M

M

M

M

GNDIO

GNDIO

GNDIO

GNDIO

OSC

OSC

OSC

OSC

RST

RST

RST

RST

R

R

R

R1

11

1

22

22

22

220

00

0K

K

K

K Ω

Ω

Ω

Ω

VDDIO

VDDIO

VDDIO

VDDIO

CVDD

CVDD

CVDD

CVDD

Separate CPU power path with

power path of large current

application

Battery

Box

Separate CPU GND with large

current application GND

IO1

C

C

C

C3

33

3

104

104

104

104

R

R

R

R2

22

2

10

10

10

10Ω

Ω

Ω

Ω

R

R

R

Rb

bb

b1

11

1

100

100

100

100Ω

Ω

Ω

Ω

R

R

R

Rb

bb

b2

22

2

100

100

100

100Ω

Ω

Ω

Ω

8050

8050

C

C

C

C2

22

2

104

104

104

104

C

C

C

C1

11

1

104

104

104

104

IO2

IO3

IO4

IO5

C

C

C

C4

44

4

104

104

104

104

There are some suggestions about PCB layout when user use

SNC21XXXA series IC with motor applications.

(1) The capacitor C1 (104) C2 (104) is strongly suggested to be as close to the chip

as possible.

(2) It had better let OSC components (R) get close to IC chip.

(3) OSC components had better get far away large current applications.

(4) Separate IC power path with large current application power path to avoid affect

IC working by power drop from large current application.

Ω

Ω

Ω

)separate VDDIO and CVDD.

(6) Let power cable thicker, especially for large current application.

(7) C3 and C4 (104) are connected at the positive point and negative point of the

motor.