EM91420B 参数 Datasheet PDF下载

EM91420 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

LOCK function

The EM91420 serial provides the LOCK function to inhibit toll dialing operation. Connecting a resistor on COL1

pin to VSS can select different LOCK control method that is conventional key lock or password lock. Also the

lock number that can be selected by connecting the resistors on COL2 or COL3 pin. After power on reset, the

password is fixed to 000 automatically. The lock function is disabled when the password is equal to 000 .

How to setup password

• Set LOCK function to password control mode. (Connects a resistor on COL1 pin to VSS)

• Off hook (or turn on HF function)

• Push :

# , # , ops1 , ops2 , ops3 , nps1 , nps2 , nps3 , #

. If the ops1~ops3 are the same with current password,

then nps1~np3 will be stored in the dialer to replace current password. Otherwise, the current password can

not be updated. All the numbers pressed in the password setup procedure can not be dialed out when current

password is not equal to 000. If the current password are equal to 000, then only the first number “#” will be

dialed out.

Normal dialing :

Set lock function to none lock mode (without resistor connected to COL1 pin) or set password equal to 000.

In this case, the dialer is operated in normal mode and all functions work at unlimitation.

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.

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

* This specification are subject to be changed without notice.

10.1.1997

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