
3
SVM7561 Series
I
TERMINAL FUNCTION
Terminal Terminal
No.
Terminal
Attribute,
Input/Output
Input
Built-in
Pull-down
Resistor
Without
Name
Terminal Function
1
XRST
For inputting reset signals.
The whole internal logic will be initialized when the
“
L
”
level voltage is
applied.
A song to be played is selected following the initialization.
When the
“
H
”
level voltage is applied, the internal logic initialization will
end and a melody will be able to be selected/played.
Since the pull-down resistor is not provided to this terminal, do not leave
this terminal open.
1) When selecting
“
Built-in CR Oscillation
”
as the reference signal source
optionally, this terminal no connect.
2) When selecting
“
External Clock Input
”
as the reference signal source
optionally, input the square wave of 32.768kHz as the reference signal
source.
GND (0V)
For inputting test signals.
Use this terminal when evaluating functions of this IC.
Never apply the
“
H
”
level voltage to this terminal.
Though this terminal is provided with the pull-down resistor, we recom-
mend you to connect this terminal to V
SS
(and apply the
“
L
”
level volt-
age) all the time in order to prevent malfunction.
For inputting play start signal.
When the
“
H
”
level voltage is applied, the operation mode will be se-
lected and play start/stop is controlled according to the optionally se-
lected play mode.
The built-in noise eliminator enables to examine input pulse widths.
When an input is judged as insufficient pulse width like noise, the
standby mode will selected.
The pull-down resistor is provided to this terminal.
For inputting music selection signals.
As input signals start up, 16 songs can be selected cyclically.
Since this terminal is not provided with noise eliminator, apply input sig-
nals not affected by noise/chattering.
Though this terminal is provided with the pull-down resistor, the pull-
down resistor is turned off and
“
high impedance input
”
prevails the termi-
nal in the standby mode. So, be sure to apply
“
L
”
level or
“
H
”
level
voltage to the terminal.
When the operation mode is selected, the pull-down resistor will turn on.
Input signals become invalid during play, but when the play mode returns
to the standby mode and the
“
H
”
level voltage is applied to this terminal,
the music will proceed to another selected one.
Power supply terminal (0.9 to 5.5V)
For outputting sound signals
Acoustic signals of main melody and accompaniment are mixed the out-
put.
Acoustic signals are output as square waves.
When
“
Envelopment Attachment
”
is selected optionally, acoustic signals
will be attenuated by the preset time constant.
Connect this terminal to the input terminal of the preamplifier through a
volume control resistor or coupling capacitor.
2
OSC
(NC)
Without
(Input)
3
4
V
SS
TEST
Power supply
Input
–
With
5
MT
Input
With
6
SEL
Input
With
7
8
V
DD
OUT
Power supply
Output
–
–
Notes: 1.NC = Non connection (Open or release)
2.Terminal numbers are for plastic PKGs. (S0P 8pin)