MCU has Class-D amp for speech

Lapis Semiconductor has added voice playback capability and a Class-D amplifier to an 8bit microcontroller.

450mW is available at the output at 3V, or 1W at 5V.

Called ML610Q304, it comes with up to 96kbyte program flash, 2kbyte data flash and 1kbyte RAM.

Hardware-based audio playback minimises CPU load, and two suggested playback formats are 16kHz 16bitPCM and 16kHz HQ-ADPCM.

Protection is included for over-current and short-circuit at the speaker terminals. And there is a time-out to protect the speaker if the output sticks high for too long. Open-circuit detection allows broken speaker wires to be flagged using an LED.

Applications are expected adding voice feedback to fire alarms and home appliance.

For development, there is a reference board and a software development environment.

Other features:

• built in oscillators – ±1.5% (-10 to 50°C), ±3.0% (-40 to 85°C)
•    8.192MHz
•    32.768kHz
• Operating range:
•    27kHz to 8.4MHz
•    -40 to 85°C
•    2.0 to 5.5V
• Four 8bit timers (can be combined into 16bit timers)
• 10bit A/D converter – three channel
• SSIO – two channel
• UART
• I2C.
• 5x5mm 28pin WQFN

 

steve bush

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