EM91450 データシートの表示（PDF） - ELAN Microelectronics

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EM91450

TONE/PULSE DIALER WITH LCD INTERFACE AND I.P.P. DETECT FUNCTION

ELAN Microelectronics 

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

I.P.P. DETECT function

The EM91450 series provide the I.P.P. function to pretect illegal connect. I.P.P means Illegal Parallel Phone

Detect. I.P.P. function depend on XMUTE pin and HKS, HF status. When in the ON-HOOK condition and HF

turn off, the XMUTE pin will be a Input pin to detect the voltage lever, otherwises, the XMUTE pin will be a

normally output pin use for control speech network. When I.P.P. function detect. XMUTE pin at "low" status (In

On-Hook and HF turn OFF state), EM91450 will turn on HF and send alarm signal to telephone line. In alarm

duration DTMF pin will continue sending "#","8" "8" signal. The DTMF signal will interfere the illegal user until

the illegal user hang up the phone and the XMUTE pin detect "high" again. The telephone circuit design can allow

the legal internal connect user. (see I.P.P Application CIRCUIT).

* This specification are subject to be changed without notice.

2.10.1999 10

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