EM91455 Просмотр технического описания (PDF) - ELAN Microelectronics
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EM91455 Datasheet PDF : 24 Pages
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EM91455 SERIES
TONE/PULSE DIALER WITH LCD INTERFACE
AND I.P.P. DETECT FUNCTION
AC ELECTRICAL CHARACTERISTIC
(Ambient temperature is 25°C, VDD=2.5V unless otherwise noted, all voltages referenced to Vss,Fosc=3.579545 MHz)
Parameter
Sym. Min. Typ. Max. Unit
Condition
Keyboard debounce time
Key tone signal: frequency
duration
Pause time
Pulse to Tone waiting time
Flash time
Pulse rate
Make/Break ratio
Inter-digit pause time
Minimum tone duration
Minimum inter-tone pause
HD key release hold function
debounce time
SDO bit time
Off-Hook delay time
Tdb
-
Fkt
-
Tkt
-
Tp
-
Tpt
-
Tf
-
-
-
-
PSR
-
-
MBR -
-
Tidp
-
-
Tp
96
Titp 96
Thdrdb -
20
- ms
600
- Hz
30
- ms
3.6
- sec.
3.6
- sec.
600
-
Row3B, Row4B=NR, NR
100
- ms Row3B, Row4B=NR, R-Vss
80
-
Row3B,Row4B=R-Vss, NR
300
-
Row3B,Row4B=R-Vss,R-Vss
20
- pps Row1 = R-Vdd
10
-
Row1 = R-Vss
40:60 - % Row2 = NR
33:66 -
Row2 = R-Vss
800
- ms PSR = 10 pps
500
-
PSR = 20 pps
98 100
98 100 ms Memory dialing
93
- ms
Tbit 3.8 3.9 4.1 ms
Tdly
-
300
- ms
DTMF output frequency (fosc = 3.579545 MHz)
Keyboard scan pin
ROW1 (f1)
ROW2 (f2)
ROW3 (f3)
ROW4 (f4)
COL1 (f5)
COL2 (f6)
COL3 (f7)
CCITT standard (Hz)
697
770
852
941
1209
1336
1477
Actual output (Hz)
699.1
766.2
847.4
947.9
1215.8
1331.6
1471.8
Deviation (%)
0.30
0.49
-0.53
0.73
0.56
-0.32
-0.35
* This specification are subject to be changed without notice.
9.24.1998 12
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