SA589 Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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Fabricante

SA589

LD/DTMF SWITCHABLE DIALLERS WITH DEDICATED KEYS FOR 20 MEMORIES

South African Micro Electronic Systems 

SA589 FAMILY

TABLE 3: Tone Frequencies

Keypad

R1

Nominal frequency (Hz)

697

Deviation from nominal (%) -0.07

R2 R3 R4 C1

770 852 941 1209

-0.10 +0.19 -0.15 -0.17

C2 C3

1336 1477

-0.20 -0.22

C4

1633

-0.31

NOTE: There will be an additional frequency error caused by any deviation of the resonator

frequency from the nominal 560kHz.

LOOP DISCONNECT DIALLING

The MASK output is provided in order to disable the speech circuit during LD dialling.

Consequently the MASK output is normally at logic '1' in the off-hook condition, but changes

to logic '0' during LD dialling. MASK also changes to logic '0' in order to signal a Timed Break

Recall (Flash) to the line.

Both MUTE and MF OUT remain low during LD dialling. LD dialling is signalled on the IMP

output. A break is signalled by a logic '0'. Make periods and IDP times are signalled by a logic

'1'. When not dialling, the IMP output sits at logic '0'.

HOOK SWITCH

KEY PRESS

COLUMN

ROW

MASK

IMP

MUTE(LOW)

MF OUT

DR-00688

"5" "8"

"TBR"

"9"

"5"

"IDP" "8"

2.2340

"9"

(PARTIAL)

ON HOOK TIME OUT

Fig. 6 LD mode timing diagram

10/14

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