EM91440 View Datasheet(PDF) - ELAN Microelectronics

Part Name

Description

View to exact match

EM91440

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

ELAN Microelectronics 

EM91440 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

FUNCTION DESCRIPTIONS

Dialing signal selection

The EM91440 series incorporated a special keyboard scanning function that is connecting a resistor (typically

is 560 Kohms) on keyboard scan pin to select many telephone specifications. The specifications are described

as following :

a. Mode

ROW1 Mode

R-Vdd 20 PPS

NR

Tone

R-Vss 10 PPS

c. Flash time

ROW3 ROW4

NR

NR

NR

R-Vss

R-Vss

NR

R-Vss R-Vss

e. Lock number

COL2 COL3

NR

NR

NR

R-Vss

R-Vss

NR

R-Vss R-Vss

Tf (ms)

600

100

80

300

Lock number

none

0

9

0.9

b. M/B ratio

ROW2 MBR (%)

NR

40:60

R-Vss

33:66

d. Lock control method

COL1

Control method

R-Vdd

key lock

NR

none lock

R-Vss

password lock

Normal dialing

Directly keying digital key on keyboard which number can be dialing output and stored in LNB memory

automatically. Operating procedure described as follow :

• To select Pulse or Tone mode.

• Off-hook or turn on HF function.

• Keying d1, d2, .. , dn. The “d” expressed digital keypad that included 1~9, *, 0, #, P, and P→T keys. The “n”

expressed unlimited.

• The numbers d1, d2, .. , dn will be dialed out in Pulse or Tone mode as selection.

LNB redial memory

Storing:

In normal dialing mode, every digital key was entry which number will be stored in LNB memory

automatically. If entry digits are more than 32 digits, the redial function of LNB memory will be disabled.

Otherwise, these numbers stored in LNB memory can be redial output.

* This specification are subject to be changed without notice.

10.1.1997 5

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