Nordic Semiconductor's VoIP reference design for low-cost USB dongle wireless headsets promotes fast, low risk development and delivers 70-hour battery talk-time from two coin cell batteries
The nRD24V1 reference design is based on Nordic's nRF24L01 ultra low power 2 Mbit/s, 2.4 GHz proprietary transceiver and enables accelerated, low risk development.
Benefits of the nRD24V1 reference design include 70-hour headset talk-times, a range of up 10 m, a plug-and-play Audio class USB dongle, and a robust RF link and globally applicable design thanks to the industry-proven nRF24L01 transceiver that operates in the global 2.4 GHz ISM band.
The reference design includes all necessary hardware and software. On the hardware side is an nRF24L01 2.4 GHz transceiver, an 8-bit microcontroller and a codec all integrated into a compact, standalone headset RF module.
The headset module is mounted on an application board with buttons for call management and a battery holder. Re-using the supplied RF module allows simple development of different headset design concepts.
On the receiver side is a production ready USB dongle comprising integrated nRF24L01 transceiver, 8-bit microcontroller, Audio class USB controller and low cost PCB antenna.
Because the dongle supports the standard Audio class, no customer driver is necessary for operation of the headset. All design files, including layout, schematics and a bill-of-material (BOM) is included in the kit. The design is also pre-tested for FCC/ETSI and USB compliance.
The software includes a unique RF protocol optimized for two-way voice application. The protocol features an advanced, agile frequency-hopping scheme providing excellent co-existence performance with other 2.4 GHz systems such as Wi-Fi, Bluetooth and cordless phones.
In addition, the protocol uses a special dual frequency diversity technique to ensure good link quality without using an additional antenna.
Support for control data transfer is built into the protocol enabling easy implementation of call management using, for example, Skype.
The protocol is implemented as a standalone software module providing a simple and intuitive API to the application layer. This means developers can easily modify and enhance the provided application code without having to handle a complex RF protocol. All software is provided as ANSI-C source code.
Price per kit is $299. Estimated shipping date is February 15, 2007. More information is available at www.nordicsemi.no.