SM8230A

SEIKO NPC CORPORATION —1

OVERVIEW

The SM8230A is a dual-tone signal generator LSI developed for DTMF (dual tone multi-frequency) dialing. It

features a built-in piezo-electric speaker driver for direct connection to a piezo-electric buzzer. The DTMF fre-

quencies can be set to correspond to the DTMF standards of any country. The output level is also adjustable

under software control. These features, combined with its small package and low power dissipation, make the

SM8230A a very use device to use.

FEATURES

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3-line serial interface to external CPU

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2 independent, adjustable frequency outputs

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Piezo driver for direct connection to a piezo-elec-

tric buzzer

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4 system clock frequencies selectable

(480kHz, 960kHz, 1.92MHz, 3.84MHz)

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2.6 to 3.3V supply voltage

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Low current consumption

• 3.0mA (max) operating current

• 1µA (max) standby current

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Package: 8-pin plastic SOP

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit: mm)

Device

Package

SM8230AS

8-pin SOP

VDD

5

4

8

1

BZH

BZL

CLK

SD

SCL

OE

VSS

Peripheral

0.4

1.27

0.4

0 to 10

5.2

0.15

+ 0.10

− 0.05

Tone Dialer with Built-in Piezo Driver