FEDL2502-03
OKI Semiconductor
ML2502
PIN DESCRIPTIONS
Symbol
I/O
Description
Input Phrase 1 Record-Start signal to this pin.
“H” level input lets the LSI start recording to the Phrase 1 memory area. Recording goes on
while this pin stays “H”. To use the LSI in Single-Phrase Recording mode, connect this pin
to the REC2 pin.
The pin is pulled down internally.
Input Phrase 2 Record-Start signal to this pin.
“H” level input lets the LSI start recording to the Phrase 2 memory area. Recording goes on
while this pin stays “H”. To use the LSI in Single-Phrase Recording mode, connect this pin
to the REC1 pin.
The pin is pulled down internally.
Input Phrase 1 Play-Start signal to this pin.
A “H” pulse input lets the LSI start playing Phrase 1. Re-inputting another “H” pulse during
playing causes the LSI to stop playing half way. To use the LSI in Single-Phrase Play
mode, connect this pin to the PLAY2 pin.
The pin is pulled down internally.
Input Phrase 2 Play-Start signal to this pin.
A “H” pulse input lets the LSI start playing Phrase 2. Re-inputting another “H” pulse during
playing causes the LSI to stop playing half way. To use the LSI in Single-Phrase Play
mode, connect this pin to the PLAY1 pin.
The pin is pulled down internally.
Input Erase-enable signal to this pin. Use this pin in combination with the REC1/REC2 pin.
To erase Phrase 1/Phrase 2, input “H” level to the REC1/REC2 pin while inputting “H” level
to the ERASE pin.
The pin is pulled down internally.
These pins are used to select a sampling frequency.
SAM2
SAM1
Fs
L
L
4.0 kHz
L
H
5.3 kHz
H
L
6.4 kHz
H
H
Unused
REC1
I
REC2
I
PLAY1
I
PLAY2
I
ERASE
I
SAM1
SAM2
MON
ROSC
MIN
MOUT
LIN
LOUT
AOUT
SPIN
SPOUT+
SPOUT–
TEST
DV
DD
DGND
AV
DD
AGND
I
O
I
I
O
I
O
O
I
O
I
—
—
—
—
Outputs “H” level during recording, playing and erasing.
Insert a 33 kΩ (No more than ±1%) resistor between the DGND and this pin. The value of
this resistor determines the clock frequency used to control the LSI’s internal operations.
While in power-down state, it falls down to GND level.
Input to the Microphone amplifier.
Output from the Microphone amplifier. Voltage amplitude is adjusted automatically to a
proper output level by the internal AGC circuit.
Input to the Line amplifier. Wired to the inverting input to the internal OP amplifier.
Output from the Line amplifier. Wired to the output from the internal OP amplifier. To
configure an inverting amplifier circuit, add a resistor to the LIN and LOUT pin respectively.
Outputs analog signal for playback from this pin.
Input to the speaker driver.
Voltage amplitude of the speaker driver can be determined by the value of the resistor
inserted between the AOUT and SPIN pins.
Outputs from the speaker driver. Connect a speaker using these two pins.
These pins output two phase-reversed analog signals for playback.
LSI testing pin. The pin must be wired to the GND.
Digital power supply pin. Insert a 0.1
µF
or larger bypass capacitor between the DGND and
this pin.
Digital ground pin
Analog power supply pin. Insert a 0.1
µF
or larger bypass capacitor between the AGND and
this pin.
Analog ground pin
3/31
OKI [ OKI ELECTRONIC COMPONETS ]
