W91210 SERIES

Publication Release Date: May 1995

- 3 -

Revision A3

Pin Description, continued

SYMBOL

16-PIN

I/O

FUNCTION

HKS

9

I

Hook switch input.

HKS = 1: On-hook state. Chip in sleep mode, no operation.

HKS = 0: Off-hook state. Chip enabled for normal operation.

DP /C4

10

O

N-channel open drain dialing pulse output (Figure 1). Flash key will

cause DP to be active in either tone mode or pulse mode.

DTMF

11

O

In pulse mode, remains in low state. In tone mode, outputs a dual or

single tone. Detailed timing diagram for tone mode is shown in

Figure 2(a, b).

OUTPUT FREQUENCY

Specified

Error %

R2

R3

R4

C1

C2

C3

697

770

852

941

1209

1336

1477

Actual

699

766

848

948

1216

1332

1472

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

R1

12, 5

I

Power input pins.