Set network news, the recording and audio playback function has become a portable and wearable devices one of the important user experience. Consumers the pursuit to lighter, thinner, shorter, smaller, can provide a longer battery life of equipment, this creates more stringent for electronics engineers design challenges. They need not only need to implement the high quality, advanced digital signal processing (DSP) algorithm, but also need to save space and save electricity. And various semiconductor recently launched LC823450 ultra-low power consumption single chip solutions, integrated with the voice of the high resolution processing, audio applications of the required functionality, and has low power consumption, small size, lower cost, speed up product and a series of advantages.
LC823450 overview
LC823450 is an audio processing system large scale integration (LSI), for the power supply is efficient ARM ® architecture ® - M3 nuclear and 32-bit / 192 kHz audio processing engine, support MP3 encoding/decoding based on hardware and wireless audio, improve performance and power efficiency. LC823450 with its abundant on-chip SRAM (1656 k bytes), to provide large amounts of memory for audio processing and application task, need not equipped with auxiliary memory chips. Designers still can use the rich integrated audio peripheral devices such as analog/digital converter, PLL and class D amplifier. In addition, the industry standard interfaces such as SPI, I2C, SDCard and UART can make product design staff built-in generic connection.
The advantage of LC823450
1. Low power consumption
LC823450 used ultra low power technology, the technology is widely used for recorder (voice, music recording), mobile music phones and portable memory player music playback, provide the market the longest battery life. The benchmark, LC823450 a rival device 70% more playing time.
2. Small size
LC823450 has integrated simulation function, and thus reduce the PCB space. Especially when using WLCSP encapsulation way, the package size is only 5.52 mm x 5.52 mm, the competitors similar devices about 50% smaller, more thin trend for wearable application.
3. Software module and DSP algorithm
In order to speed up software design and maximize the lower development costs, various semiconductor provides one-stop shop service, including a large number of exempt from royalties and licensing fees and the digital signal processing (DSP) code libraries, and development services based on customer requirements, including advanced features such as noise eliminator, and strengthen the low frequency intelligent virtual excitation of low frequency broadcast (S - Live). In mobile devices, usually use a small speakers to reduce equipment size and weight. But small speakers cannot play low frequency, sound quality will also decline. S - Live using various semiconductor patent psychoacoustics bass enhancement algorithm, virtual ground to play the bass signal. Noise canceller in audio applications can be used for non-stationary noise elimination.
The characteristics of LC823450
. 1. Cortex-M3双核，AMBA®(AHB/APB)系统• 内部SRAM (1.5M字节)• 内部ROM (256字节)• SDRAM控制器64M至256M位SDRAM / 移动SDRAM• 外存储器控制器支持NOR Flash、SRAM、ROM，和8/16位LCD控制器接口可提供内部ROM boot和外存储器boot• DMA控制器(8ch)• 中断控制器(外部90ch，内部82ch)• 串行外设接口SPI(1ch)• 串行Flash 接口(1ch)可提供四线串行外设接口、高速缓冲存储器(16k字节、4路组相联、128线)功能1.8 V专用电源• UART (3ch)UART1: 流控制 (清除发送、请求发送)UART0，UART2：流控制• I2C (2ch) 单主机• GPIO (90ch)• Plain Timer / 看门狗定时器 (1ch x 3)• 多重定时器 (2ch x 4)• 10位ADC (6ch)• SD 卡 接口 (3ch)SD0：支持eSD/eMMC boot (内置ROM Boot功能) ，1.8 V专用电源SD1：多路内存条接口，1.8 V专用电源SD2：1.8 V专用电源• USB2.0主机 (高速/全速/低速)控制器，器件 (高速/全速)控制器。 USB function integration of the physical Xtal (XT1) 48 MHz for host, 48 MHz 12/20/24 / OTG function for devices, the host and device Shared integration of the physical, real time clock (RTC) can provide general RTC and KeyInt RTC two modes, KeyInt RTC function, which can realize the electricity support serial debugging (SWD) as a debugging interface support serial line viewer (SWV) as a tracking interface, can only be tracking a architecture (M3 nuclear
2. MP3 encoding based on hardware/decoder: MP3 MPEG1, MPEG2, MPEG2.5
3. LPDSP32 system
Internal SRAM (120 k bytes), internal ROM (220 k bytes), WMA WMA decoder configuration file (Microsoft), AAC (MPEG4 LC - AAC), variable speed control playback (0.5 to 4 times speed) to WMA and AAC play, speed up to 2 times to PCM play up to four times the speed based on the hardware of the MP3, up to four times the speed, noise canceller
4. Provide bluetooth protocol stack
5. Other audio functions
, 6 band equalizer (EQ3), the volume, mute, noise meter, audio generator/timer interrupt, 16/24/32 192 kHz PCM interface (2 ch 2 x), synchronous sampling frequency converter (SSRC), asynchronous sampling frequency converter (works for ASRC) : reduce jitter function supports USB and bluetooth audio streaming, Beep generator, digital microphone interface (ch 2 x 1), a 16-bit audio DAC (ch 2) class D amplifier used in earphone (ch 2). Need external LC low pass filter
6. The audio clock generator
, a special phase lock loop used for audio, optional phase-locked loop reference clock
conclusion
Various advanced audio processing single chip scheme of semiconductor LC823450 leading integration and high power efficiency, mobile devices such as portable and wearable provides superior experience, high resolution audio will enjoy hearing ascend to a new level. Rich integration features, hardware acceleration and simple software terms, simplify product design personnel, reduce development cost, speed up product on the market.
