ML2250 datasheet(13/36 Pages) OKI

13 / 36 page

FEDL2250DIGEST-09

OKI Semiconductor

ML2250 family

13/36

QFP

WCSP pin

ML2256

WCSP pin

Symbol

Type

Description

D6/SCK

I/O

CPU interface data bus pin in the parallel input interface.

Usually outputs

“L” level when RD = “L” level.

Works as serial clock input pin in the serial input interface.

When the SCK input is at

“L” level on the falling edge of WR,

RD, DW

, the DI input is captured in the device on the rising

edge of SCK clock. And when the SCK input is at

“H” level

on the falling edge of WR, RD, DW, the DI input is captured

on the falling edge of SCK clock.

D7/DI

I/O

CPU interface data bus pin in the parallel input interface.

Usually output

“L” level when RD is at “L” level.

Works as serial data input pin in the serial input interface.

DAO

DAO pin outputs analog signal of 14-bit DAC.

AOUT

AOUT pin usually outputs the analog signal of 14-bit DAC

via voltage follower.

SERIAL

CPU interface switching pin.

Serial input interface at

“H” level. And parallel input interface

“L” level.

CPU interface chip select pin.

When CS pin is at

“H” level, the WR, DW, and RD signals

cannot be input to the device.

OPTANA

Keep this pin

“L” level. The analog signal of 14-bit DAC is

output from DAO pin and from AOUT pin via voltage

follower.

CPU interface write signal.

When CS pin is at

“H” level, the WR signal cannot be input to

the device.

Data write signal when using EXT command for the voice

output.

Set the pin to

“H” level when not using EXT command.

When CS pin is at

“H” level, the DW signal cannot be input to

the device.

This pin has a pull-up resistor built in.

CPU interface read signal.

When CS pin is at

“H” level, the RD signal cannot be input to

the device.

This pin has a pull-up resistor built in.

7, 8

B3, A4

TESTO1

TESTO2

Output pin for testing.

Keep this pin open.

AVDD

—

Analog power supply pin.

Insert a 0.1 F or larger bypass capacitor between this pin

and AGND pin.

13, 40

B5, C1

A6,B1

DVDD

—

Digital power supply pin.

Insert a 0.1 F or larger bypass capacitor between this pin

and DGND pin.

AGND

—

Analog ground pin.

17, 31,

C6, D1,

C1,C7,E1

DGND

—

Digital ground pin.

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