Description

The SM8230AS-ET 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 SM8230AS-ET a very useful device.

Specifications and 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

Application Scenarios

The SM8230AS-ET is commonly used in applications that involve DTMF dialing. It is suitable for various electronic devices that require dual-tone signal generation, such as telecommunication systems, remote control systems, and security systems.

Comparison

• Dual-tone signal generator for DTMF dialing
• Built-in piezo-electric speaker driver
• Adjustable output level under software control
• Small package and low power dissipation

• Requires external CPU for communication
• Limited to 2 independent frequency outputs
• Specific system clock frequencies selectable
• 8-pin plastic SOP package may have space limitations