SA2532KB datasheet(6/21 Pages) SAMES

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SA2532KA/B

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ONE COMMON GROUND

BAL

RETURN LOSS

LINE

REF

SIDE TONE

STB

SYN

Figure 3

Double balanced bridge (return loss and side tone)

with one common ground

Dialling Functions

Valid Keys

The keypad of the SA2532K comprises a maximum

of 19 keys. A Bi-polar scan technique is used so

that the 19 keys are scanned in a partial 4 x 6

matrix using only 8 pins and 2 diode.

The key

scanning is enabled when HS/DPN is pulled high

and VDD is above VREF. A valid key is detected when

one and only one contact closure is detected

between a Row and Column Pin. Key contacts are

debounced to avoid incorrect detection. It is also

possible to connect a controller to the rows and

columns.

Dial Mode Selection

The default mode (LD or MF) can be selected by

the Mode pin. When default LD mode is selected, a

temporary change to MF can be invoked by

pressing the * key. Once in MF mode the MODE

OUT pin becomes active. The circuit will revert to

LD by pressing either one of the Recall keys or by

next on-hook.

When MF mode is selected by the mode pin, the

circuit can not be changed temporary to LD but will

remain in MF. In LD mode the speech circuit will be

muted for the duration of the IDP.

Last Number Redial

LNR is a facility that allows re-signalling of the last

manually dialled number without keying in all the

digits again. The LNR is repeatable. A manually

entered number is automatically stored in the LNR

RAM. The capacity of the LNR RAM is 31 digits. If

a number greater than 31 digits is entered, the LNR

facility will be inhibited (Until new entries < 32 digits)

and further entries will be buffered in a First In First

Out Memory (FIFO). Post dialled digits, i.e. digits

manually entered after LNR has been invoked, are

not stored in RAM but buffered in FIFO.

Pauses can be inserted by pressing the PAUSE

key. Each pause is 2 seconds when inserted within

the first 5 digits otherwise a wait function will halt

dialling until PAUSE or LNR key is depressed.

Recall Function

A Recall activation will invoke a Flash (Timed Loop

Break).

If Recall is the first entry in a digit string, it will be

stored in LNR RAM when digit(s) are entered after

the Recall.

If the recall key is depressed after a digit string has

been entered or dialled out, the recall will not be

stored but buffered in the FIFO together with

subsequently entered digits.

If pressing the recall key is not followed by digit

entries, the LNR RAM remains intact. After a recall

a 274ms second pause will automatically be

executed.

Both Recall keys will be functional in both MF and

LD dialling modes.

Memory Keys

The single memory (M5) can be used to directly

access a stored number of not more than 21 digits.

During

programming

multiple

pauses

can

inserted by pressing the PAUSE or LNR key. Each

pause is 3 seconds long when inserted within the

first 5 digits otherwise a wait function (infinite pause)

will be executed until the PAUSE or LNR key is

depressed

Mute Function

The MUTE key is enabled in speech mode only.

Depressing the MUTE key mutes the microphone

amplifier.

Repressing the MUTE key deactivates

the mute (toggle function). Any key entry overwrites

a mute activated by the MUTE key and mute will be

deactivated.

When privacy mute is activated a reminder tone is

applied to the ear piece every 274ms.

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