SA589 Datasheet, PDF (10/14 Pages) Sames – LD/DTMF SWITCHABLE DIALLERS WITH DEDICATED KEYS FOR 20 MEMORIES

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
sames