CF5762AB0 datasheet(8/10 Pages) NPC

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CF5762AB0

NIPPON PRECISION CIRCUITS INC.—8

Melody Stop at Night

The melody output can be disabled at night by the

state of AMI and PMI. This function disables the

melody output from 11:00PM to 5:45AM, inclusive.

AMI and PMI have built-in pull-down resistors.

Note that when used together with the melody stop

when dark function, melody output can be disabled

by either function.

Melody Stop when Dark

When a CdS element and resistor is connected

between CO4N and VDD with the mid-point poten-

tial connected to CDS, the CDS input can be used to

detect the brightness and to stop melody output when

the surroundings become dark.

The CDS input has a built-in pull-up resistor when

inactive. This pull-up is switched off when CO4N

output is LOW. CO4N goes LOW in response to the

hourly signal input on MT signal. The melody play

output is then disable/enabled depending on the state

of the CDS input.

If this function is not used, the CDS input must be

tied HIGH.

Note that when used together with the melody stop at

night function, melody output can be disabled by

either function.

Melody Play Mode

The melody output plays in complete one-shot mode

only.

A complete one-shot melody plays through to the

end of a whole melody and does not start again as

long as the current melody play conditions do not

change, even if the hourly signal is input again.

However, if during melody play the melody output

stops or other melody start conditions change, the

current melody output may stop.

AMI

PMI

Melody output

LOW

Always enabled

LOW

HIGH

Disabled during PM hours (PM ﬂag is HIGH)

HIGH

LOW

Disabled during AM hours (PM ﬂag is LOW)

HIGH

Always disabled

CDS

Melody output

LOW

Disabled due to darkness

HIGH

Enabled

Figure 3. Darkness detection circuit

Figure 4. Darkness detection timing

CDS

CO4N

VDD

CdS element

MT etc

11.719ms

15.625ms

CO4N

Open

Pull-up

Pull-down

CDS

Read clock

(on rising edge)

HIGH:play mode (light)

LOW:non-play mode (dark)

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