L3914AN データシートの表示（PDF） - STMicroelectronics

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L3914AN

SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION

STMicroelectronics 

L3914A - L3924A - L3934A

FUNCTION PIN DESCRIPTION (continued)

To dial a number from repertory memory (HKS

must be low), enter the following:

MEM (Location 0-9) or E1-E3

To save the last number dialed, enter the follow-

ing:

PROG MEM (location 0-9) or E1-E3

HOOK FLASH

D1 FLASH D2 ...etc

Hook flash may be entered into the dialed se-

quence at any point by keying in the function key,

FLASH. Flash consists of a timed break of

585ms, 300ms or 100ms depending on the Mask

option. When a FLASH key is pressed, no further

key inputs will be accepted until the hookflash

function has been dialed. The key input following

a FLASH will be stored as the initial digit of the

new number, overwriting the number dialed be-

fore the FLASH, unless it is another FLASH.

FLASH key pressed immediately after hookswitch

or LND will not clear the LND buffer unless digits

are entered following the FLASH key.

Example:

FLASH

LND not cleared

LND FLASH

LND not cleared

LND FLASH D1 D2

LND buffer will contain D1, D2

PAUSE/LAST NUMBER DIALED

If the PAUSE/LND key is pressed right after off

hook or FLASH key, it is considered as LND, if it

is pressed after a digit, it will be considered as

PAUSE.

LAST NUMBERED DIALED

OFF-HOOK PAUSE/LND or FLASH PAUSE/LND

Last number dialing is accomplished by entering

the PAUSE/LND key.

PAUSE

OFF-HOOK D1 PAUSE/LND D2 ...etc

A pause may be entered into the dialed sequence

at any point by keying in the special function key,

PAUSE/LND. Pause inserts a 3.1 second delay into

the dialing sequence. The total delay, including pre-

digit and post-digit pauses is shown in Table 3.

Table 3: Special Function Delays

Each delay shown below represents the time re-

quired after the special function key is depressed

until a new digit is dialed. The time is considered

”FIRST” key if all previous inputs have been com-

pletely dialed. The time is considered ”AUTO” if in

redial, or if previous dialling is still in progress.

Function First/Auto

SOFTSWITC H

PAUSE

FIRST

AUTO

FIRST

AUTO

Delay (seconds)

Pulse

To ne

0.2

1.0

2.6

3.0

3.4

3.1

HOLD

When HOLD key is pressed during off hook, there

are two options. The first option is to mute the

phone (LED will blink) and the conversation can

be resumed by pressing the HOLD key again.

The second option is to mute the phone (LED will

blink), on-hook the phone (LED will still blink at

1Hz frequency) and automatic switch off the

phone when parallel phone is off-hook.

The HOLD function is disabled when the line cur-

rent drops below 20mA.

SOFTSWITCH FUNCTION USING TONE/PULSE

MODE SWITCH

When dialing in Pulse mode after off-hook, switch-

ing TONE/PULSE mode switch from Pulse to Tone

will cause the device to change the signaling mode

into tone signal and store the softswitch function in

the LND memory for redial. To redial the softswitch

function (mixed mode dialing) in the pulse mode af-

ter going on-hook and back to off-hook, you have

to switch the TONE/PULSE mode switch back to

pulse mode either before going on-hook or after off-

hook or during on-hook.

Subsequentmode change from Tone to Pulse will

change the signaling mode to pulse dialing se-

quence but this mode change will not be stored in

.the LND memory.

When dialing in Tone mode after off-hook, a switch-

ing of TONE/PULSE mode Switch from Tone to

Pulse will cause the device to change the signaling

mode into pulse mode but this mode change will

not be stored in the LND memory. When LND key

is pressed in Tone mode after going off-hook, the

device will output all tone signals.

A pacifier tone of 75ms is provided after 32ms

deboun ce time when switching from Pulse to

Tone mode.

Redial by the LND key will repeat the mixed dial-

ing sequence in Pulse mode.

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