LAPIS Semiconductor, a ROHM Group Company, has recently announced the development of a low-power microcontroller (MCU) that integrates an 8-bit core, speech synthesis circuit, high-efficiency Class-D speaker amp, non-volatile memory, and oscillator circuit on a single chip, making audio playback possible by simply connecting to a speaker. The ML610Q304 also provides hardware-based audio playback operation that minimizes the load placed on the MCU for system control processing, and the newly designed high-efficiency Class-D amp reduces current consumption during audio playback by about 40% while maintaining volume and is easier to incorporate into battery-driven devices.
Recommended: 5A Charger IC Cuts Charge Time up to 60%
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. In addition, improvements in sensor technology along with greater awareness for safety and security have resulted in the increased adoption of alarm equipment that demand redundant safety measures such as advanced detection of abnormal audio playback in order to ensure reliable performance during emergencies and other unforeseen events.
Related: 15W and Multi-Device Wireless Charging
2. 40% less current consumption during voice playback (vs. LAPIS’ conventional products) A class-leading low power consumption 8-bit microcontroller is integrated along with a newly-developed Class-D speaker amp that provides digital output, resulting in higher power efficiency and 40% less current consumption during voice output compared with conventional analog Class AB speaker amps – while maintaining volume levels.
3. Monolithic design with integrated MCU and audio playback function reduces the number of parts required and contributes to device miniaturization All functions required for audio playback are incorporated into a single chip, including a low-power MCU, speech synthesis circuit, high-efficiency Class-D speaker amp, non-volatile memory, and high accuracy oscillator circuit. Offered in a compact (5mmx 5mm) 28pin package (WQFN) that contributes to end-product miniaturization.
Opinion: Applying National Elelctric Code Class 2 Power for Remote DAS and Small Cells
4. Multiple fail-safe functions provide superior reliability (1) Speaker terminal disconnection detection; Detects no-playback condition due to disconnection between the microcontroller and speakers by monitoring for changes in resistance value between the speaker terminals and can alert users beforehand by lighting up LEDs. (2) Speaker terminal short-circuit detection; Detects no-playback condition due to short-circuit by monitoring the voltage level of the speaker terminals and shuts down operation in order to prevent possible damage. (3)Class D speaker amp overcurrent prevention; Ensures that the sound generator circuit (pwm circuit) does not stay fixed at the H level for over a specified amount of time in order to prevent excessive heat generation due to overcurrent.
Additional features include: Built-in original high-performance 8-bit RISC core; Integrated high efficiency Class D speaker amp (3.0V: 0.45W, 5.0V: 1.0W); Multiple fail-safe functions (speaker is connection/short-circuit detection, Class D speaker amp overcurrent prevention); High-precision oscillation: 8.192MHz, 32.768kHz <+/- 1.5% (-10 to 50 degrees C), +/- 3.0% (-40 to 85 degrees C)>; 96kB Flash; 2kB data Flash; 1kB RAM; 8-bit timer x 4 (two 8-bit timers can be used as a 16-bit timer); 3-ch 10-bit A/D converter; Operating frequency: 27kHz to 8.4MHz; Operating temperature range: -40 to 85 degrees C; Power supply voltage: 2.0 to 5.5V; and Compact WQFN28 package. Samples are available now with production scheduled for June.
source: http://www.powerpulse.net/story.php?storyID=32169
Comments are closed.
