Silan

Semiconductors

SC91310 Series

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 2.1

2002.12.03

5

PIN DESCRIPTION

Pin No.

Pin Name

I/O

Description

1~4

&

15~18

Column-

Row Inputs

I

The keyboard input may be from either the standard 4x4 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.

7,8

XT, XT

I,O

A built-in inverter provides oscillation with an inexpensive 3.579545 MHz crystal

or ceramic resonator.

9

T/P MUTE

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.

13

MODE

I

places the dialer in pulse mode (10 pps). Leaving mode pin floating places the

dialer in pulse mode (20 pps).

10

HKS

O

Hook switch input. HKS = 1: On-hook state. Chip in sleeping mode, no

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

11

DP

O

N-channel drain dialing pulse output (Figure 1). Flash key will cause DP to go

active in both pulse mode and tone mode.

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

single tone. Detailed timing diagram for tone mode is shown in Figure 2(a, b).

Output Frequency(Hz)

Specified

Actual

Error %

R1

697

699

+0.28

R2

770

766

-0.52

R3

852

848

-0.47

R4

941

948

+0.74

C1

1209

1216

+0.57

C2

1336

1332

-0.30

12

DTMF

O

C3

1477

1472

-0.34

14,6

I

Power input pins.

5

B/M

I

The break make ratio is 60:40 if /M = 1 and is 66.6:33.3 if B/M = 0. This pin has

no function in DTMF mode.