OKI

ML2502

ML2502 Data Sheet (Revision 8.0)

3

n PIN DESCRIPTION

REC1

I

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.

PIN

I/O

Description

REC2

I

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.

PLAY1

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.

PLAY2

I

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

I

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.

SAM1

SAM2

I

Pins used to select a sampling frequency.

SAM1

SAM1

Fs

L

L

4.0kHz

L

H

5.3kHz

H

L

6.4kHz

H

H

Unused

MON

O

Output "H" level during record or playback operation.

Insert a 30k

Ω resistor between this pin and the DGND pin. The resistor determines the

oscillation frequency for the internal oscillation circuit.

ROSC

I

MIN

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

O

LIN

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

O

AOUT

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

Output from the speaker driver. Connect a speaker in-between these pins.

Output two phase-inverted analog signals for playback from the speaker driver.

SPOUT+

SPOUT-

O

DVDD

−

Digital power supply pin. Insert a 0.1

µF or larger bypass capacitor between this pin and

the DGND pin.

DGND

−

Digital ground pin.

AVDD

−

Analog power supply pin. Insert a 0.1

µF or larger bypass capacitor between this pin and

the AGND pin.

AGND

−

Analog ground pin.