OKI
ML2502
n PIN DESCRIPTION
PIN
I/O
I
Description
Input start-recording signal for Phrase 1 to this pin.
"H" level input to this pin initiates recording to Phrase 1 memory area. Recording goes on
while this pin being held "H". In single-phrase mode, the pin is connected to the REC2 pin.
The REC1 pin is internally pulled down.
REC1
Input start-recording signal for Phrase 2 to this pin.
"H" level input to this pin initiates recording to Phrase 2 memory area. Recording goes on
while this pin being held "H". In single phrase mode, the pin is connected to the REC1 pin.
The REC2 pin is internally pulled down.
REC2
PLAY1
PLAY2
ERASE
I
I
I
I
I
Input start-playback signal for Phrase 1 to this pin.
A "H" pulse input to this pin initiates playback of Phrase 1. Re-inputting a "H" pulse during
playback causes to stop playback. In single phrase mode, the pin is connected to the
PLAY2 pin. The pin is internally pulled down.
Input start-playback signal for Phrase 2 to this pin.
A "H" pulse input to this pin initiates playback of Phrase 2. Re-inputting a "H" pulse during
playback causes to stop playback. In single phrase mode, the pin is connected to the
PLAY1 pin. The pin is internally pulled down.
Erase-enable signal input pin, used together with the REC1 and/or REC2.
Input "H" level to the REC1/REC2 pin with this pin being held "H" to erase respective
phrase.
The pin is internally pulled down.
Pins used to select a sampling frequency.
SAM1
SAM2
SAM1
SAM1
Fs
L
L
L
H
H
L
H
H
4.0kHz
5.3kHz
6.4kHz
Unused
MON
ROSC
MIN
O
I
Output "H" level during record or playback operation.
Insert a 30k resistor between this pin and the DGND pin. The resistor determines the
oscillation frequency for the internal oscillation circuit.
W
I
Input to the Microphone amplifier.
Output from the Microphone amplifier. Voltage amplitude is automatically controlled to an
appropriate output level by the internal AGC circuit.
MOUT
LIN
O
I
Input to the Line amplifier. Connected to inverted input for the internal Op. amplifier.
Output from the Line amplifier. Connected to the output pin from the internal Op. amplifier.
Connecting resistors to the LIN and LOUT pins configures an inverted amplifier.
LOUT
AOUT
O
O
Output analog signal for playback.
Input to the speaker driver. The resistor's value inserted between the AOUT and SPIN pin
determines voltage amplitude of the speaker driver. Select an appropriate value
depending on types of speaker in use.
SPIN
I
SPOUT+
SPOUT-
Output from the speaker driver. Connect a speaker in-between these pins.
Output two phase-inverted analog signals for playback from the speaker driver.
O
m
Digital power supply pin. Insert a 0.1 F or larger bypass capacitor between this pin and
the DGND pin.
-
-
-
-
DVDD
DGND
AVDD
AGND
Digital ground pin.
Analog power supply pin. Insert a 0.1
the AGND pin.
mF or larger bypass capacitor between this pin and
Analog ground pin.
ML2502 Data Sheet (Revision 8.0)
3
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