CF5761 series
Alarm Control
The alarm is controlled using AI, SN, and SEL inputs. These pins have built-in chattering elimination circuits
to prevent incorrect operation due to input chatter. The alarm output timing in response to these inputs is shown
in the following figure.
Input
Function
Input chatter elimination
Alarm control input.
When AI is active, the specified alarm pattern is output on AO1, AO2 and AO3.
AI
t
t
< 62.5ms, the input is not accepted.
> 125ms, the input is accepted.
ON
Snooze function control input.
When the snooze input is accepted, the snooze time count begins. The snooze time is 300s.
SN
ON
62.5ms ≤ t ≤ 125ms, the input state is
ON
undefined.
Alarm function select input.
Selects one of two alarm patterns. When SEL is switched (from HIGH to LOW, or LOW to
HIGH), the snooze state and auto-stop function is released, and the alarm signal is output.
SEL
ON
AI
OFF
ON
SN
OFF
B
SEL
A
B
A
B
A
A
5min
5min
5min
5min 5min
5min 5min
Alarm output
A
A
B
B A
B
B
B
A
Alarm
stops
Snooze
released
Auto-stop Auto-stop
released
SEIKO NPC CORPORATION —7
NPC [ NIPPON PRECISION CIRCUITS INC ]
