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.

FEATURES

■ 3-line serial interface to external CPU

■ 2 independent, adjustable frequency outputs

■ Piezo driver for direct connection to a piezoelectric buzzer

■ 4 system clock frequencies selectable (480 kHz, 960 kHz, 1.92 MHz, 3.84 MHz)

■ 2.6 to 3.3 V supply voltage

■ Low current consumption

? 3.0 mA (max) operating current

? 1 μA (max) standby current

■ 8-pin plastic SOP