Silicon Labs has introduced a fixed-function audio bridge device that provides a simple, turnkey solution for transferring digital audio data between the universal serial bus (USB) and integrated inter-IC sound (I²S) serial bus interfaces. The new CP2615 is targeted at a wide range of power-sensitive, space-constrained USB audio applications based on the Android, Windows, Linux and Mac operating systems, including headphones, headsets, speakers, MP3 accessories, navigation systems and point-of-sale terminals.
While USB connectivity seems simple for consumers, USB audio design can be very challenging, and developers need a fast, painless way to add USB connectivity to their audio accessories. The CP2615 digital audio bridge provides a drop-in USB-to-I2S connectivity solution that requires no USB audio knowledge or protocol expertise, enabling developers to focus on their end applications instead of firmware development.
The chip is available in a compact 5 x 5 mm QFN-32 package, making it ideal for portable audio applications with limited printed circuit board (PCB) space. It includes a USB 2.0 full-speed function controller, USB transceiver, on-chip oscillator, I²S audio interface, I²C control interface and embedded Flash memory for storing device configurations.
The audio bridge provides a cost-effective solution for low-end and mid-market headphones requiring a 48 kHz sampling rate. The small-form-factor device is also ideal for USB dongles designed for consumers who own high-end headphones that use an analog jack for audio. Many new smartphone designs are eliminating the analog headphone jack, offering only one USB connector to support both charging and audio connectivity. As a result, consumers often buy simple, low-cost dongles that interface the 3,5 mm analog jack to a USB-C to Micro USB adapter, enabling them to continue to use their existing headphones.
Silicon Labs’ popular Simplicity Studio development environment includes an easy-to-use, GUI-based Xpress Configurator tool that simplifies USB audio design. Using the Xpress Configurator, developers can configure and customise their digital audio applications in three easy steps. The configurator tool also enables developers to take advantage of Silicon Labs’ flexible factory programming options to speed time to market.
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