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參數(shù)資料
| 型號(hào)： | MK53761 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | REPERTORY DIALER |
| 中文描述： | 劇目撥號(hào)器 |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 199K |
| 代理商： | MK53761 |
FUNCTIONAL PIN DESCRIPTION (DIP18 only)
V+
Pin 1. V+ is the positive supply for the circuit and
must meet themaximum andminimum voltage re-
quirements.(see electrical specifications).
MODE
Input.Pin 2. MODE determines the dialer’s default
operatingmode. When the deviceis poweredupor
thehookswitchinputis switchedfromon-hook,(V+),
to off-hook,(V–), the defaultdeterminesthe signal-
ing mode. A V+ connection defaults to tone mode
operation and a V– connection defaults to pulse
mode operation.
Whendialinginthepulsemode,asoftswitchfeature
will allow a changeto thetonemode wheneverthe
* key,orsoftswitch,isdepressed.Subsequent*key
inputswill causetheDTMFcodeforan*tobedialed.
Thesoftswitchwillonlyswitchfrompulsetotone.Af-
ter returning to on-hook and back to off-hook, the
partwillbeinpulsemode.RedialbytheLND keywill
repeat thesoftswitch.
C1, C2, C3, C4, R4, R3, R2, R1
Keyboard inputs. The MK53761 interfaces with
either thestandard2-of-8 with negativecommon or
the singlecontact(Form A) keyboard.
A valid keypad entry is either a single Row con-
nectedtoasingleColumnorV–simultaneouslypre-
sentedto both asingle Row and Column. In its qui-
escentorstandbystate, during normal off-hookop-
eration, either the Rows or the Columns are at a
logic level 1 (V+). Pulling one inputlow enablesthe
on-chip oscillator.Keyboard scanningthen begins.
ScanningconsistsofRowsandColumnsalternately
switching highthroughon-chippullups.Afterboth a
Row and Column keyhave been detected,thede-
bouncecounterisenabledandanynoise(bouncing
contacts, etc.) is ignored for a debounce period
(TK
D
) of32ms.Atthistime,thekeyboardissampled
and if bothRow and Column informationare valid,
the information is bufferedinto the LND location. If
switchedon-hook(pin 17to pin 1), thekeyboardin-
putsall pull high through on-chippullup resistors.
Figure2
: KeypadConfiguration.
In thetonemode, if 2 or more keysin thesamerow
or if 2 or more keys in the same column are de-
pressed a single tone will be output. The tone will
corres-pond to the row or column for which the 2
keyswerepushed.Thisfeatureis fortest purposes,
and single toneswill notbe redialed.
Alsointhetonemode,theoutputtoneiscontinuous
is manualdialingaslong as thekeyis pushed.The
outputtone durationfollows the table1.
Table 1 :
OutputToneDuration.
Key-Push Time, T*
T
≤
32ms
Tone Output*
No Output Ignored by
MK53761
75ms Duration Output
Output Duration = T – T
KD
32ms
≤
T
≤
75ms + T
KD
T
≥
75ms + T
KD
* TKD is the key pad debounce time which is typically 32 ms.
Whenredialinginthetonemode,eachDTMFoutput
is 75ms duration,and the tone separation(intersig-
nal delay) is 50ms.
V–
Input. Pin 6 is the negativesupply input to the de-
vice. This is the voltage referencefor all specifica-
tions.
OSC1, OSC2
Pin 7 (input), pin 8 (output).OSC1 and OSC2 are
connectionsto an on-chipinverter used as the tim-
ingreferenceforthecircuit. Ithassufficientloopgain
to oscillate when used with a low-cost television
color-burstcrystal. Thenominalcrystal frequencyis
3.579545MHz andanydeviationfrom thisstandard
is directly reflected in the Tone outputfrequencies.
Thecrystaloscillatorprovidesthetime referencefor
all circuit functions.A ceramic resonatorwith toler-
ance of
±
0.25% may also be used.
DTMF OUTPUT
Output.Pin10.AnNPNtransistoremitterwithacol-
lectortiedto V+drivestheDTMF OUTPUT pin.The
transistor base is connected to an on-chip opera-
tional amplifier that mixes the Row and Column
tones.Figure 7 shows thetiming at this pin.
The DTMF OUTPUT is the summation of a single
Row frequency and a singleColumn frequency. A
typical single tone sine wave is shown in Figure 4.
This waveform is synthesized using a resistor tree
withsinusoidally weighted taps.
The MK53761 is designed to operate from an un-
regulatedsupply; theTONE LEVELis supply inde-
pendent,andthesinglerowtoneoutputlevelwill be
typically :
T
oi
= –12 dBm
±
1 dB
TheDC componentof theDTMFoutputwhileactive
is describedby the following equation:
VDC
1
= 0.3 V+ + 0.5 Volts
MK53761
2/11
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