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SM8230A

Tone Dialer with Built-in Piezo Driver

Nippon Precision Circuits  

SM8230A

NIPPON PRECISION CIRCUITS INC.

Tone Dialer with Built-in Piezo Driver

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 frequencies 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.

PINOUT

SD 1

SCL

OE

VSS 4

8 VDD

BZH

BZL

5 CLK

PACKAGE DIMENSIONS

FEATURES

s 3-line serial interface to external CPU

s 2 independent, adjustable frequency outputs

s Piezo driver for direct connection to a piezo-

electric buzzer

s 4 system clock frequencies selectable (480 kHz,

960 kHz, 1.92 MHz, 3.84 MHz)

s 2.6 to 3.3 V supply voltage

s Low current consumption

• 3.0 mA (max) operating current

• 1 µA (max) standby current

s 8-pin plastic SOP

5.2 0.3

1.27

0.4 0.1

+

0.15−

0.10

0.05

0 10

0.4 0.2

NIPPON PRECISION CIRCUITS—1

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