它把數(shù)字手持設(shè)備的核心功能轉(zhuǎn)移到移動(dòng)/手持設(shè)備的USB連接器,這樣連接器能實(shí)現(xiàn)充電,PC同步和音頻附件功能,使制造商能簡(jiǎn)化他們的設(shè)計(jì),縮小占位面積和降低成本.解決方案提供了PNX0161的主要性能,方塊圖以及應(yīng)用電路。
The NXP Nexperia low-power USB audio device PNX0161 is a single-chip solution for digital, USB Audio-based headset accessories. It moves the core digital headset functions to the USB connector of a mobile/portable device, so the connector performs battery charging, PC synchronization, and headset This small, low-power, and fully USB-compliant IC makes it easy to build digital-headset accessories for mobile/portable devices. It provides stereo playback and recording, with optional FM radio, across a USB link operations. In this way, manufacturers can deliver systems with just a USB connector, and thereby simplify their designs, shrink footprint, and reduce cost.
Available in a small TFBGA88 package (7 x 7 mm), it builds on the USB standard to provide audio playback and recording functionality that is directly powered by the USB bus.
The PNX0161 is fully compliant with USB specifications, so it provides plug-and-play operation with any USB host or On-The-Go (OTG) device. It supports USB Audio and
Human Interface Device (HID) Classes, and requires very little power (~10 mA at Vbus) for playback mode.
When connected to a USB host or OTG device, a headset based on the PNX0161 is powered by the USB physical bus. The host streams digital audio to the PNX0161-based headset accessory, synchronizes it to the local clock to prevent audio artifacts (sample rate conversion), and converts the resulting signal to analog. The headset accessory can capture audio from a microphone, line input, or tuner, and can convert it to a digital USB Audio stream that is subsequently streamed to the host.
主要特性:
Full-speed (12 Mbps) USB device fully compliant with USB host or USB OTG
Single-chip solution for USB headset
USB bus powered (Vbus at 5 V)
Low power consumption (~10 mA at Vbus)
High suppression of phone noise
Stereo record and playback at sample rate of 48 kHz
USB Audio and HID Classes
FM radio via low-power analog bypass mode
ARM7TDMI core with on-chip SRAM, ROM,and optional NOR Flash
Wide range of connectivity and audio interfaces
Intelligent power management
Available in two versions: programmable Flash or cost-effective ROM
88-pin TFBGA package (7 x 7 mm with 0.5-mm pitch)
高度集成的硬件和軟件:
The PNX0161 is a fully programmable solution that uses an ARM7TDMI core with an embedded DC/DC converter that is powered through the USB bus. There is 256 kB of on-chip NOR Flash, 32 kB of SRAM, and 32 kB of boot ROM.
For added power savings, there is embedded power-management functionality, plus intelligent power and DMA control. The PNX0161 is specially designed to suppress
noise coming from the host (e.g. GSM noise).
The IC includes I2S input and output interfaces, a fast UART with DMA support, a master/slave I2C-bus interface, a 24-bit stereo ADC with programmable amplifier (for microphone, line input, and tuner input), a microphone bias block, and a 24-bit
stereo DAC with a Class AB headphone amplifier for high-quality audio.
Stereo recording and playback operate at a sample rate of 48 kHz. There is USB Audio streaming, full support for HID Class, USB Device Firmware Upgrade, and audio
post-processing features like volume control and optionally other sound features.
The PNX0161 is available in two versions – programmable Flash or cost-effective ROM – that can be switched seamlessly during product ramp-ups.
PNX0161方框圖:
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http://mcuol.com/download/upfile/75015981.pdf