Renesas PROM Programming Adapter PCA7435FPG02 Specifikace stáhnout pdf (Strana 50)

7534 Group

Rev.3.00 Oct 23, 2006 page 50 of 53

REJ03B0099-0300

Fig. 54 Handling of VCC, USBVREFOUT pins of M37534M4-XXXGP

Outline PLQP0032GB-A

P

0

7

P

1

0

/

R

X

D

/

D

-

P

1

1

/

T

X

D

/

D

+

P

1

2

/

S

C

L

K

P

1

3

/

S

D

A

T

A

P

1

4

/

C

N

T

R

0

P

2

0

/

A

N

0

P

2

1

/

A

N

1

3

2

3

1

30

2

9

2

8

27

26

25

P3

4

(LED

4

)

P3

3

(LED

3

)

P3

2

(LED

2

)

P3

1

(LED

1

)

P3

0

(LED

0

)

V

SS

X

OUT

X

IN

9

10

11

12

13

14

15

16

2

8

7

6

5

3

1

4

V

C

C

C

N

V

S

S

R

E

S

E

T

P

2

2

/

A

N

2

P

0

5

2

0

1

7

1

8

1

9

2

1

2

4

P

0

2

P

0

4

P

0

3

P

0

6

2

3

2

2

P

0

1

P

0

0

U

S

B

V

R

E

F

O

U

T

M37534M4-XXXGP

P

2

3

/

A

N

3

P

2

4

/

A

N

4

P

2

5

/

A

N

5

V

R

E

F

1

.

5

kΩ

Reason of ➀ is to reduce the effect by switcing noise of microcomputer to the

analog circuit generating USBV

REFOUT output. Use the bigger capacitor and

connect to device at the shortest distance.

Reason of ➁ is to prevent the instability of the USBV

REFOUT output due to

external noise.

➁

➀

Connect a capacitor to a device as

close as possible. For the capacitor,

a ceramic capacitor or an electrolytic

capacitor of 0.22 µF is recommended.

Connect a bypass capacitor to a device

as close as possible. For the capacitor,

a ceramic capacitor or an electrolytic

capacitor of 1.0 µF is recommended.

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