LAPIS Semiconductor has recently announced the development of a low power microcontroller that has an integrated 8-bit low power MCU core, speech synthesis circuit, highly efficient Class-D speaker amp, non-volatile memory and oscillator circuit on a single chip, making audio playback possible by simply wiring up a speaker.
The ML610Q304 has a typical audio power output of 450 mW operating at 3 V or 1 W at 5 V. The controller includes four 8-bit counters which can be combined to make two 16-bit timers, a three channel 10-bit A/D converter, a two channel SSIO, UART and I2C peripheral interfaces. The memory capacity of the ML610Q304 includes a 96 KB program flash, 2 KB data flash and 1 KB RAM. The dedicated hardware-based audio playback helps reduce CPU loading. Two suggested audio playback formats are 16 kHz 16-bit PCM and 16kHz HQ-ADPCM. The Class-D amp reduces current consumption during audio playback by approx. 40% compared to conventional solutions, making it a good choice for incorporation into mobile battery-powered devices. In recent years a growing number of electronic products are adding voice playback functionality, particularly battery-driven devices that require increased miniaturization and lower power consumption for longer operating life.
8-bit MCU with built-in 1 W Audio Amp – [Link]