W91410 SERIES

- 2 -

PIN CONFIGURATION

1

16

R3

C2

C3

C4

2

3

4

5

6

11

12

13

14

15

R1

R2

DTMF

DD

V

7

8

9

10

17

18

XT

C1

R4

XT

T/P MUTE

MODE

DP

B/M

HKS

PIN DESCRIPTION

SYMBOL

PIN

I/O

FUNCTION

Column-

Row Inputs

1

−4

&

15

−18

I

The keyboard input may be from either the standard 4

× 4 keyboard

or an inexpensive single contact (form A) keyboard. Electronic

input from a

µC can also be used. A valid key entry is defined as a

single row being connected to a single column.

XT, XT

7, 8

I, O

A built-in inverter provides oscillation with an inexpensive

3.579545 MHz crystal or ceramic resonator.

T/P MUTE

9

O

The T/P MUTE is a conventional CMOS N-channel open drain

output. The output transistor is switched on during pulse and tone

mode dialing sequence and flash break. Otherwise, it is switched

off.

MODE

13

I

Leaving mode pin floating places the dialer in pulse mode (20 ppS).

HKS

10

I

Hook switch input.

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

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