EM91455 查看數據表（PDF） - ELAN Microelectronics

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EM91455

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

ELAN Microelectronics 

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

Dialing via LOCK function

Conventional key lock mode. (Connects a resistor on COL1 pin to VDD)

• Off hook (or turn on HF function)

• Keying : d1 , d2 , .. , dn . If the first number (d1) is the same with the lock number that optioned in table,

then all entry numbers can not be dialed out and keyboard will be inhibited until on to off hook once again.

If the first number is not equal to lock number, all the entry numbers will be dialed out.

Password control mode. (Connects a resistor on COL1 pin to VSS)

• Off hook (or turn on HF function)

• Keying : ([ # , ps1 , ps2 , ps3 ] + telephone number.) The numbers in the [ ] symbol could be omitted. The

number “#” will be inhibited when the current password is not equal to 000,and ps1 , ps2 , ps3 work at the

checking state, not to be dialed out. Other descriptions are as on following :

◊ Incorrect password entry. The telephone numbers can not be dialed out.

◊ Password is omitted . If the first digit of telephone numbers is the same with the lock number, all of the

telephone numbers can not be dialed out and keyboard will be inhibited until On to Off hook once again.

If the first digit is not equal to the lock number then the telephone numbers will be dialed out entirely.

◊ Correct password entry. The telephone numbers can be dial out no matter what lock number is. If the first

digit is not equal to the lock number then the telephone numbers will be dialed out entirely and use the Flash

key to redial any other number will not check the pass word again.

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 ).

I.P.P. DETECT function

The EM91455 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), EM91455 will turn on HF and HDO then 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 illegal internal connect user. (see I.P.P Application CIRCUIT).

* This specification are subject to be changed without notice.

9.24.1998 10

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