Summary of Contents for Nordic Semiconductor nRFready
- Page 1 Microphone nRF6915/AKMS_MIC_2 User Guide v1.0 All rights reserved Reproduction in whole or in part is prohibited without the prior written permission of the copyright holder. 2011-11-24...
- Page 2 Microphone User Guide Liability disclaimer Nordic Semiconductor ASA reserves the right to make changes without further notice to the product to improve reliability, function or design. Nordic Semiconductor ASA does not assume any liability arising out of the application or use of any product or circuits described herein.
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Page 3: Table Of Contents
Microphone User Guide Contents Introduction ....................4 Who should read this User Guide?............4 System requirements................4 Required reading ..................4 Writing Conventions................5 Kit content....................6 Hardware content .................6 Firmware content ..................6 Documentation..................7 Finding content on the web..............7 System overview ..................8 Kit operation ....................10 Pairing procedure .................11... -
Page 4: Introduction
The Reference Design Kit is delivered programmed and pre-paired, and there is no special user procedure required to start evaluating the nRFready Microphone design. Follow the Getting Started Guide to quickly set up the Kit to start streaming audio from two microphones to one receiver. -
Page 5: Writing Conventions
Microphone User Guide Writing Conventions This User Guide follows a set of typographic rules to make the document consistent and easy to read. The following writing conventions are used: • Commands are written in Courier New. • Pin names are written in bold Courier New. -
Page 6: Kit Content
Microphone User Guide Kit content Figure 1. nRFready Microphone Development Kit content Hardware content The nRFready Microphone hardware consists of: • 2 microphone boards • 1 receiver board • 2 AAA battery holders • 4 AAA batteries • 1 USB cable... -
Page 7: Documentation
Finding content on the web Follow the Getting Started Guide in order to find the source code and documentation for the nRFready Microphone. Then download and unzip the files to a folder on your PC that you want to use for development. -
Page 8: System Overview
Microphone User Guide System overview As technology has evolved, microphone applications have changed. One might say the trend has gone from technology mainly used on the TV, to technology mainly used in front of the TV. All video game consoles, for example, have one or more music video games which require microphones. - Page 9 Microphone User Guide All the communication in the system is digital and packet-based, which means that data between the units is exchanged as discrete packets of information. The raw audio throughput of each microphone is 32 kHz x 16bit = 512 kbps, while the on-air data rate of the packet-based communication is 4 Mbps. This additional bandwidth allows the system to cope with tough interference and yet maintain un-interrupted audio between microphones and receiver.
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Page 10: Kit Operation
Microphone User Guide Kit operation When connecting the receiver board to the computer, the receiver board will identify itself as a standard sound card that can record audio on the computer. Alternatively, analog output from the RCA sockets can be connected to an audio amplifier input. -
Page 11: Pairing Procedure
Repeat the procedure if you also want to pair the second microphone. Programming boards If you want to customize the nRFready Microphone, you can program the receiver- and microphone board microcontrollers using a third-party development tool. The nRFready Microphone uses a PICkit 2 Development Programmer for in-circuit programming of the PIC16F684 microcontroller. -
Page 12: Compiling Firmware
Microphone User Guide Figure 3. Receiver board and microphone setup with PICkit2 Compiling firmware The project source files can be opened and compiled in MPLAB IDE. There are separate project files for the microphone and receiver board. The receiver board can be compiled as-is with no changes, but the microphone project uses the same source files for both microphones, referred to as the red microphone and the blue microphone. -
Page 13: Hardware Description
Microphone User Guide Hardware description This chapter contains block diagrams and a description of each board in the reference design. Refer to the product specification for the various ICs before making any changes to the design. nRF2788 Microphone The microphone board has a 3.5mm mini-jack header for a full-differential microphone input. For demonstration purposes a MP3 player can also be used. -
Page 14: Nrf2789 Receiver
Microphone User Guide nRF2789 Receiver The receiver board has two nRF2460 wireless mono audio streamers to receive audio from two nRFready microphones. The digital signal is fed to two AK4430 stereo DACs which in turn output the converted analog signal to two phono outputs and an AK5374 USB ADC for USB connection to a computer. The board will enumerate as a two-channel recording device when connected to a computer. -
Page 15: Layout Guidelines
Figure 7. Annotated photograph of receiver board Layout guidelines Download and open the nRFready Microphone design files to view the schematic, PCB layout, Bill of Materials and production files. To ensure optimal performance it is essential that you follow the schematics- and PCB layout references closely. -
Page 16: Antenna
The top layer ground plane areas are connected to the bottom layer ground plane areas through a large number of vias. For further reference, see the nRFready Microphone PCB layout files in Altium Designer, .pdf or gerber formats. -
Page 17: Programming Interface
(ISP) interface on the microphone- and receiver boards, respectively. RF regulation The nRFready Microphone Reference Design has been tested on key RF parameters in a certified lab for the purpose of demonstrating compliance with ETSI 300-328, FCC CFR 47 paragraph 15.247 and Industry Canada RSS-210, Issue 8 &... - Page 18 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Nordic Semiconductor nRF6915...
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