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SC8560 Datasheet(PDF) 5 Page - Silan Microelectronics Joint-stock

Part No. SC8560
Description  The SC8560 is an alarm equipped digital clock IC with built-in drivers capable of directly driving LED display equipment.
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Maker  SILAN [Silan Microelectronics Joint-stock]
Homepage  http://www.silan.com.cn
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 5 page
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Silan
Semiconductors
SC8560
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.1
2003.06.26
5
(Continued)
Terminal Description
Operating Description
Power Failure Detection display
If the power supply voltage drops and is applied again, all the on-segments flash
and the power failure indication mode is entered. The power failure indication
mode is released by applying VSS to “hour set” or “ minutes set”.
Alarm Operation and Alarm
Output
The alarm signal outputs when alarm content marches the time .When not reset
by either snooze input or alarm off input, output continues after l hour and 59
minutes. This output signal consists of 900 Hz 2 Hz intermittent (50% duty)
modulation signals. When the need arises, a filter can be applied to alter the alarm
signal to a DC signal.
Snooze Input
When the alarm is sounding and instantly activating Vss to this pin, alarm output is
set to OFF for a period between 8 and 9 minutes after which time the alarm signal
is once again output .The snooze function can be used repeatedly in l hour and 59
minutes intervals. A pull-down resist is built-in. Activating Vss to the snooze pin
when the alarm is OFF resets the sleep timer counter to [0:00].(This is known as
the one-touch sleep timer reset function.)
Alarm Off Input
Activating this input pin to Vss instantly sets alarm output to OFF. A pull-down
resistor is built-in.
Sleep Timer and Sleep Output:
Sleep output can turn on the radio and can be set for time intervals of 59 minutes
or l hour and 59 minutes. Refer to Table 2 for the proper selection procedure (59
minutes or l hour and 59 minute selection). This sleep timer is constructed using a
down counter and when the counter content arrives at [00], output is set to off and
the radio turns off .Adding Vss to snooze input turns sleep output off, when sleep
output is on.
TABLE 1: DISPLAY MODES
Selective
Input
Alarm
Sleep
Display Mode
Digit No.1
Digit No.2
Digit No.3
Digit No.4
NC
NC
Time display
10’s place for
hour ,AM/PM
Hour
10’s place for
minute
Minute
Vss
NC
Alarm display
10’s place for
hour ,AM/PM
Hour
10’s place for
minute
Minute
NC
Vss
Sleep display
Clear
Hour
10’s place for
minute
Minute
Vss
Vss
Second display
Clear
Minute
10’s place for
second
Second
Note: Activating Vss using two inputs simultaneously (alarm select and sleep select), the display mode is switched
to display seconds.




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