CF5761 series

SEIKO NPC CORPORATION —7

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

AI

Alarm control input.

When AI is active, the specified alarm pattern is output on AO1, AO2 and AO3.

62.5ms

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SN

Snooze function control input.

When the snooze input is accepted, the snooze time count begins. The snooze time is 300s.

SEL

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

Alarm output

5min

5min

AA

B

B A

SN

5min

B

5min 5min

AI

5min

5min

BB

A

A

AB

A

B

Auto-stop

released

Auto-stop

Snooze

released

Alarm

stops

ON

OFF

ON

OFF

B

A