1997 Jan 15

6

Philips Semiconductors

Product specification

Programmable multi-tone telephone ringer

PCD3360

7.6

Selection of tone sequences (TS1 and TS2)

four standard tone sequences shown in Fig.4. Different tone sequences of 15 or 16 consecutive tones and pauses can

be mask programmed to order. The seven tones (plus pause) available are shown in Fig.5, together with the

corresponding ROM codes.

The tone sequences are repeated continuously provided the enable conditions at inputs FDE and FDI are valid and

Fig.4 Tone sequences mask-programmed in the PCD3360.

handbook, full pagewidth

3

pin state

tone code

tone code

tone code

tone code

MGD715

H

H

L

H

H

L

L

L

TS1

TS2

tone sequence output at pin TONE

33

22

2

444

7

7

7

6

66

44

4

4

0

4

044

4

4

4

4

40 0

13

1

1

3

1

313

3

1

3

1

3

3

1

45

4

4

5

4

545

5

4

5

4

5

5

4

Fig.5 Available tones (including pause) and their corresponding ROM codes.

handbook, full pagewidth

tone key

−

cd

e

g

b

c

e

tone code

1

2

3

4

5

6

7

MGD714

frequency (Hz)

533

0

0

600

667

800 1000 1067 1333

frequency ratio

8

9

10

12

15

16

20

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