Silan
Semiconductors
SC8560
(Continued)
Te rmina l De sc ription
Ope ra ting De sc ription
If the power supply voltage drops and is applied again, all the on-segments flash
Power Failure Detection display and the power failure indication mode is entered. The power failure indication
mode is released by applying VSS to “hour set” or “ minutes set”.
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
Alarm Operation and Alarm
minutes. This output signal consists of 900 Hz 2 Hz intermittent (50% duty)
Output
modulation signals. When the need arises, a filter can be applied to alter the alarm
signal to a DC signal.
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
Snooze Input
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.)
Activating this input pin to Vss instantly sets alarm output to OFF. A pull-down
Alarm Off Input
resistor is built-in.
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
Sleep Timer and Sleep Output:
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
Se le c tive
Input
Displa y Mode
Digit No.1
Digit No.2
Digit No.3
Digit No.4
Ala rm Sle e p
10’s place for
hour ,AM/PM
10’s place for
hour ,AM/PM
10’s place for
minute
NC
Vss
NC
NC
NC
Time display
Alarm display
Sleep display
Second display
Hour
Hour
Minute
Minute
Minute
Second
10’s place for
minute
10’s place for
minute
Vss
Vss
Hour
Clear
Clear
10’s place for
second
Vss
Minute
Note: Activating Vss using two inputs simultaneously (alarm select and sleep select), the display mode is switched
to display seconds.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.1
2003.06.26
5
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
