CF5762AB0 Datasheet, PDF (7/10 Pages) Nippon Precision Circuits Inc – Analog Chime Clock CMOS IC

CF5762AB0
MELODY FUNCTION DESCRIPTION
Melodies
There are 4 melodies stored, and which can be played hourly.
Time Function
If the following conditions are satisfied when a
HIGH-level hourly signal is input on MT, then
hourly melody output occurs. The hourly melody is a
combination of melody output and subsequent chime
signals. MT has a built-in pull-down resistor.
The number of chimes played are determined by
time detection in 12-hour mode.
Melody Select Switching
<Melody conditions>
1. The hourly signal turns OFF once before turning
ON
2. Melody stop at night function is not set for cur-
rent time interval (see “Melody Stop at Night”)
3. Melody stop when dark function is not active
(see “Melody Stop when Dark”)
If S1 to S4 are all HIGH (no chime), then condition
number 2 is ignored. If the time information inputs
change state and an hourly signal on MT is input
during melody output, the output stops and then
starts again under the new conditions.
The melody to be played is selected by the state of
SEL1 and SEL2. SEL1 and SEL2 have built-in pull-
down resistors.
<Melody switch function>
SEL1
LOW
HIGH
LOW
HIGH
SEL2
LOW
LOW
HIGH
HIGH
Melody
(hourly signal)
Melody 1 + chime
Melody 2 + chime
Melody 3 + chime
Melody 4 + chime
Time Detection
The time information inputs are only read when the
hourly signal is input on MT. At all other times the
internal data does not change, even if the time infor-
mation inputs change state. The hours 1 through 12
are represented in 12-hour mode with an internal PM
flag. The PM flag reverses state when the hour
switches from 11 to 12, or from 12 to 11 if the time
setting is being reversed to adjust to the correct time.
When the S1 to S4 inputs are all HIGH, the melody
output plays without chimes. These inputs determine
the time detection and are read into internal registers
when the hourly signal is input on MT. Other input
combinations not shown are invalid. S1 to S4 have
built-in pull-down resistors.
S4
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
HIGH
S3
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
HIGH
LOW
HIGH
S2
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
S1
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
LOW
HIGH
Time
1 o’clock
2 o’clock
3 o’clock
4 o’clock
5 o’clock
6 o’clock
7 o’clock
8 o’clock
9 o’clock
10 o’clock
11 o’clock
12 o’clock
No change
No chime
NIPPON PRECISION CIRCUITS INC.—7