Recording and audio playback functions have become one of the important user experiences of portable and wearable devices. Consumers continue to pursue lighter, thinner, shorter, and smaller devices that can provide longer battery life, which brings more stringent design challenges to electronic component engineers. They not only need to implement high-quality, advanced digital signal processing (DSP) algorithms, but also need to save space and power. The LC823450 ultra-low-power single-chip solution recently launched by ON Semiconductor integrates high-resolution sound processing and functions required for audio applications, and has ultra-low power consumption, small size, cost reduction, and faster product launch. Series advantages.
LC823450 overviewLC823450 is an audio processing system large scale integrated circuit (LSI), powered by an energy-efficient ARM Cortex-M3 core and a 32-bit/192 kHz audio processing engine, supporting hardware-based MP3 encoding/decoding and wireless audio to improve performance And power efficiency. With its sufficient on-chip SRAM (1656k bytes), LC823450 provides a large amount of memory for audio processing and application tasks without the need for auxiliary memory chips. Designers can also take advantage of a wealth of integrated audio peripherals such as analog/digital converters, phase-locked loops and class D amplifiers. In addition, industry standard interfaces such as SPI, I2C, SDCard and UART enable product designers to build in universal connections.
Figure 1: Low-power, high-resolution audio processing system LSI-LC823450
Advantages of LC8234501. Ultra-low power consumption
LC823450 adopts ultra-low power consumption technology, which is widely used for music playback in recorders (voice, music recording), mobile music phones and portable memory players, providing the longest battery life on the market. After benchmarking, the LC823450 has 70% more playback time than competing devices.
2. Small size
LC823450 has integrated analog functions, thus reducing PCB space. Especially when the WLCSP package is used, the package size is only 5.52mm x 5.33mm, which is about 50% smaller than similar devices of competitors, which is in line with the trend of thinner wearable applications.
3. Software module and DSP algorithm
In order to speed up software design and minimize development costs, ON Semiconductor provides one-stop software services, including a large number of digital signal processing (DSP) code libraries that are free of royalties and license fees, and development services based on customer requirements , Including advanced features such as noise cancellers, and low-frequency intelligent virtual excitation (S-Live) that enhances low-frequency playback. In mobile devices, a small speaker is usually used to reduce the size and weight of the device. However, small speakers cannot play low frequencies, and the sound quality will be degraded. S-Live uses ON Semiconductor's patented psychoacoustic bass enhancement algorithm to play bass signals virtually. Noise cancellers can be used for non-stationary noise cancellation in audio applications.
Features of LC823450
Figure 2: LC823450 block diagram
1. Cortex-M3 dual core, AMBA (AHB/APB) system
• Internal SRAM (1.5M bytes)
• Internal ROM (256 bytes)
• SDRAM controller
64M to 256M bit SDRAM / mobile SDRAM
• External memory controller
Support NOR Flash, SRAM, ROM, and 8/16-bit LCD controller interface
Can provide internal ROM boot and external memory boot
• DMA controller (8ch)
• Interrupt controller (external 90ch, internal 82ch)
• Serial peripheral interface SPI (1ch)
• Serial Flash interface (1ch)
Provides four-wire serial peripheral interface, high-speed buffer memory (16k bytes, 4-way group connection, 128 lines) functions
1.8 V dedicated power supply
• UART (3ch)
UART1: Flow control (clear to send, request to send)
UART0, UART2: flow control
• I2C (2ch) single host
• GPIO (90ch)
• Plain Timer / Watchdog Timer (1ch x 3)
• Multiple timers (2ch x 4)
• 10-bit ADC (6ch)
• SD card interface (3ch)
SD0: Support eSD/eMMC boot (built-in ROM Boot function), 1.8 V dedicated power supply
SD1: Multi-channel memory module interface, 1.8 V dedicated power supply
SD2: 1.8 V dedicated power supply
• USB2.0 host (high-speed/full-speed/low-speed) controller, device (high-speed/full-speed) controller. USB function requires integrated physical layer Xtal (XT1)
48 MHz is used for the host, 12/20/24/48 MHz is used for the device OTG function, the host and the device share the integrated physical layer
• Real Time Clock (RTC)
Two modes of general RTC and KeyInt RTC can be provided, and KeyInt RTC can realize power-on function
• Support serial wire debugging (SWD) as a debugging interface
Supports serial wire viewer (SWV) as a trace interface, only one Cortex-M3 core can be traced
2. Hardware-based MP3 encoder/decoder: MP3 MPEG1, MPEG2, MPEG2.5
3. LPDSP32 system
• Internal SRAM (120k bytes)
• Internal ROM (220k bytes)
• WMA (Microsoft WMA decoder configuration file)
• AAC (MPEG4 LC-AAC)
• Variable speed control playback (0.5 to 4 times speed)
Up to 2 times the speed when playing in WMA and AAC
Up to 4x speed when playing in PCM
Up to 4 times the speed when playing in hardware-based MP3
• Noise canceller
4. Bluetooth protocol stack available
5. Other audio functions
• 6-band equalizer (EQ3)
• Volume, mute
• Noise meter
• Audio timer/interrupt generator
• 16/24/32 bit 192 kHz PCM interface (2ch x 2)
• Synchronous sampling frequency converter (SSRC)
• Asynchronous sampling frequency converter (ASRC): jitter reduction function supports USB audio level and Bluetooth streaming
• Beep generator
• Digital microphone interface (2ch x 1)
• 16-bit audio DAC (2ch)
Class D amplifier is used for headphones (2ch). Requires external LC low-pass filter
6. Audio clock generator
• Dedicated phase-locked loop for audio
• Optional PLL reference clock
to sum upON Semiconductor’s advanced audio processing single-chip solution LC823450 has leading integration and high power efficiency, providing a better experience for portable and wearable mobile devices, and high-resolution audio will elevate the listening experience to a new level. Rich integration features, hardware acceleration functions and simple software terms simplify the work of product designers, reduce development costs, and accelerate product launches. LC823450 related technical documents, including application notes, evaluation board manual, bill of materials and circuit schematics, etc. are available in? id=LC823450 download.
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