CP2114-GM Ver la hoja de datos (PDF) - Silicon Laboratories
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CP2114-GM Datasheet PDF : 44 Pages
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CP2114
1. System Overview
All major commercial operating systems (Windows, Linux, Mac, iOS) support the standard USB Audio Device
class. Codecs and DACs typically have only an I2S (Inter-IC Sound) digital interface, and thus cannot connect
directly to a host system. In addition, when a DAC is powered on, it typically needs to be configured by the host via
an I2C (inter-integrated-circuit) digital interface, with a non-standard protocol. Finally, in order to support push
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
appliance typically involves complex USB protocol programming as well as I2S and I2C programming capability,
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
read-only memory (ROM), I2S (audio) interface, I2C (control) interface, and UART interface in a compact 5 x 5 mm
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
Enumerates to the host as a Standard USB Audio Device and HID Consumer Control supporting:
USB Digital Audio Out (Audio Playback Device)
USB Digital Audio In (Microphone/Recording Device)
HID Consumer Control handling standard volume and mute functionality
Pre-configured support for 3 commercial DACs
Handles all I2C configuration of the DAC automatically at boot
Handles all volume and mute traffic converting from USB to I2C messages to the DAC
Tested for USB plug & play and audio quality on all major operating systems
UART interface using standard USB HID device class which is natively supported by most operating
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.
12 GPIO signals which support alternate functions
Volume control, UART transmit and receive, UART hardware flow control, UART transmit/receive toggle,
configurable clock output, and DAC selection
Support for I/O interface voltages down to 1.8 V is provided via a VIO pin.
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-CS42L55 evaluation kit (Part Number: CP2114-CS42L55EK) includes:
CP2114 USB-to-I2S Digital Audio motherboard
Cirrus Logic CS42L55 Codec daughtercard (includes a 3.5mm male-to-male audio cable)
CP2114-WM8523 evaluation kit (Part Number: CP2114-WM8523EK)
CP2114 USB-to-I2S Digital Audio motherboard
Wolfson Microelectronics WM8523 DAC daughtercard
CP2114-PCM1774 evaluation kit (Part Number: CP2114-PCM1774EK)
CP2114 USB-to-I2S Digital Audio motherboard
Texas Instruments PCM1774 DAC daughtercard
All kits with daughtercards include a USB cable, ear bud headphones, and full documentation.
Contact a Silicon Labs sales representatives or go to www.silabs.com to order a CP2114 Evaluation Kit.
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Rev. 1.1
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