SC91415AP Ver la hoja de datos (PDF) - Silan Microelectronics

Número de pieza

componentes Descripción

Fabricante

SC91415AP

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY

Silan Microelectronics 

Silan

Semiconductors

SC91415 SERIES

J) Ring detector

The Ring detector is designed to prevent illegal dialing from pocket dialer. Following the procedures ( i,ii,iii ), this

dialer will detect DRING pin to control RMUTE output level. If DRING is detected a “Low” level, the

RMUTE stays “High impedance”. If DRING is detected a “High” level, the RMUTE will output “Low” until

keyboard entry. In actual application of the RMUTE pin is recommended connection to microphone of the phone

handset to prevent that the dialing signal (DTMF) is coupling by the Microphone of the phone handset. (such as

pocket dialer)

i. In idle state, HKS is from “High” to “Low” (pick up handset action).

ii. In idle state, turn on handfree function.

iii. The flash operation ( F key ).

TIMING DIAGRAMS

HKS

KEY IN

Tdb

KT

XMUTE

HDO

SDO

PO

DTMF

OSC.

2

3

Tkt

Tm

Tidp

TbTm Tb Tm

Tidp

Tdly

Pulse mode operating timing

Hi-impedance

HKS

KEY IN

KT

XMUTE

HDO

SDO

PO

DTMF

OSC.

2

3

Tdb

Td

Titp

DTMF mode operating timing

Titp

Hi-impedance

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.0

2001-11-13

15

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