CP2114

4

Rev. 1.1

1. System Overview

All major commercial operating systems (Windows, Linux, Mac, iOS) support the standard USB Audio Device

directly to a host system. In addition, when a DAC is powered on, it typically needs to be configured by the host via

button volume and mute synchronization with the host system, the target USB device must support the standard

USB-HID Consumer Control interface. Thus, adding USB digital audio to an embedded system or as dongle or

prototyping, integration and testing. The CP2114 USB Audio Bridge is specifically designed to overcome all these

issues and commoditize USB Audio and DAC configuration for turn-key product development.

Note: Use with an iPad requires a camera kit connector to get USB from the Apple 30-pin connector. USB Audio is not sup-

ported on the iPhone.

The CP2114 includes a USB 2.0 full-speed function controller, USB transceiver, oscillator, one-time programmable

QFN-32 package (sometimes called “MLF” or “MLP”). The one-time programmable ROM on the device may be

used to customize both product information (including USB fields such as Vendor ID, Product ID, Strings, etc...)

and external DAC configuration strings. By default, the CP2114 provides the following features



USB Digital Audio Out (Audio Playback Device)



USB Digital Audio In (Microphone/Recording Device)



HID Consumer Control handling standard volume and mute functionality





Handles all volume and mute traffic converting from USB to I

systems



No custom driver installation needed



Windows and MAC DLLs provided and interface specification is available for development on any operating

system



Implements transmit (TX), receive (RX), hardware flow control (CTS, RTS)



Baud rate support from 300 to 1 Mbps, support for 5-8 data bits, 5 parity options, 3 types of stop bits



Note: The

CP2114 devices will not enumerate as a standard HID mouse or keyboard.



Volume control, UART transmit and receive, UART hardware flow control, UART transmit/receive toggle,

configurable clock output, and DAC selection



An evaluation kit for the CP2114 (Part Number: CP2114EK) is available. It includes a CP2114-based USB-to-Audio

motherboard, a USB cable, and full documentation. Additional kits with daughtercards are available as well:



CP2114 USB-to-I



Cirrus Logic



CP2114 USB-to-I



Wolfson Microelectronics WM8523 DAC daughtercard



CP2114 USB-to-I



Texas Instruments PCM1774 DAC daughtercard

All kits with daughtercards include a USB cable, ear bud headphones, and full documentation.