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Table of contents for the manual
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Page 1
All right s reserved . Reproduction in whole or in part is prohibited without the prio r written permissi on of the copyright holder . February 2007 Headset Reference Design nRD24V1 User Guide v1.0[...]
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Revision 1.0 Page 2 of 25 User Guide Liability disclaimer Nordic Semiconductor ASA reserves th e right to make changes without furthe r notice to the product to improve reliability , function or design. Nordic Semico nductor ASA does not assume any liability arising out of the application or use of any product or circuits describ ed herein. Life su[...]
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Revision 1.0 Page 3 of 25 Headset Reference Design v1.0 Content s 1 Introduction ......................................... .............................. ............... ........... 4 2 System Description ............... ............................................ ............... ........... 5 3 Hardware description ... ...........................[...]
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Revision 1.0 Page 4 of 25 User Guide 1 Introduction This user guide is for the nRD24V1 headset referen c e design, a voice quality wireless headset for V oice over IP (V oIP) applications . The qualit y of the au dio in this de sign is the sam e as the au dio quality in tele- phony . This user guide describ es the nRD24V1 system, HW modu les and g [...]
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Revision 1.0 Page 5 of 25 Headset Reference Design v1.0 2 System Description The headset unit can be used to communicate with either a USB dongl e or an audio dongle. Note: The audi o dongle is simply a headset unit with differ ent firmware and jumper settings. Figure 1. ”Head set unit with a USB con figuration” and Fi gure 2. ”System diagram[...]
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Revision 1.0 Page 6 of 25 User Guide Figure 4. System diagram of headset unit with audi o dongle configuration The headset unit and the au dio dongle are based on the same hardwa re. Both use an audio codec to pro- vide coding and decoding of th e an alog audio signal s to 16- bit linear PCM code. This bit stream is pro- cessed by the micro control[...]
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Revision 1.0 Page 7 of 25 Headset Reference Design v1.0 3 Hardware description 3.1 nRD24V1 Radio module The radio module is a complete system for teleph one quality wireless headse t applications intended for V oIP . It can be u sed in a he adset, or in an aud io module fo r connectio n to a PC au dio outlet . There ar e 6 GPIOs for buttons or LE D[...]
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Revision 1.0 Page 8 of 25 User Guide 3.1.2 Micro controller The micro controller is an A VR, A Tmega88 and runs on a 4.096 MHz crysta l. The micro controller ’s main tasks are: • Setting up codec an d RF circu its. • Converting 16 bit PCB audio samples from the codec t o 8 bit a-la w samples to th e radio circu it. • Converting 8- bit a-law[...]
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Revision 1.0 Page 9 of 25 Headset Reference Design v1.0 3.1.7 Specifications T able 1. Electrical Specifications T able 2. Physical Specifications Operating c onditions Status Va l u e Supply voltage 1.9 - 3.6 V Current con sumption Idle < 1 mA av er age (15 mA peak) at 2.5 V supply Connected < 7 mA average (15 mA peak) at 2.5 V supply Radio [...]
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Revision 1.0 Page 10 of 25 User Guide 3.2 Application board The nRF24L01-VHR1 app lication board cont ains all peripherals nece ssary to build a complete audio m od- ule from the nRF24L 01-VHR1 radio module . Figure 6. Application board comp one nts 3.2.1 Audio interface This module can be used to set up a wireless audio link, for example, from a P[...]
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Revision 1.0 Page 11 of 25 Headset Reference Design v1.0 3.2.1.1 Headset interface The loudspeaker(s) are dr iven dif ferentially , and need so me filtering due to the class D output amplifier of the audio codec. Figure 7. ”L oudspeake r interface” shows a typical filter network that can be used for driv- ing a headset loudspeaker . The filter [...]
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Revision 1.0 Page 12 of 25 User Guide Figure 9. PC output interface 3.2.2 Jumpers The application board can be se t up to interface a head set microphone and loudspeaker , or a PC audio outlet by placing the ju mpers as shown in T able 3. ”Audio filter settings” below . The filter component s mounted shou ld be ap propriate for most headset lou[...]
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Revision 1.0 Page 13 of 25 Headset Reference Design v1.0 3.2.5 Buttons There are five button s on the application board and th ese are connected to the A VR micro controller on the radio module as shown in Figure 10 . ”Button mapping”. Figure 10. Button mapping 3.2.6 Programming The radio module ca n be programmed through th e 6-pin ISP connect[...]
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Revision 1.0 Page 14 of 25 User Guide 3.3 USB dongle The USB dongle establishe s a wireless audio link with the radio module in a he adset and is identified as an audio device in the PC operating system. The USB dongle is mo unted on a 0.8 mm , 4-layer FR4 ci rcuit board, with component s on both sides of the board. Figure 1 1. nRD24V1 USB dongle t[...]
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Revision 1.0 Page 15 of 25 Headset Reference Design v1.0 3.3.1 USB Interface The USB interface is handled by the Sonix SN1 1220 USB Audio Controller . All the USB communications are handled by the SN1 1220. The audio samples are 16 bit linear PCM on the I2S port, wher e the micro controller a cts as a bus mast er (P ADFUN m ode 4’1 100 in the SN1[...]
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Revision 1.0 Page 16 of 25 User Guide 3.3.6 Specifications T able 4. Electrical Specifications T able 5. Physical Specifications Operating conditions Stat us Va l u e Supply voltage 4.5 - 5.5 V Current consumption Idle < 24 mA Connected < 28 mA Radio freq ue n c y 2402-247 8 MH z Output power 0 dBm PCB attributes Description PCB type 0.8mm 4 [...]
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Revision 1.0 Page 17 of 25 Headset Reference Design v1.0 4 Hardware design guidelines This chapter describes im portant issu es that might affect you when deve loping the headset reference design for a finish ed product. T he USB dongle can be used as-is, but the headset must be re designed to fit into a headset fo r a finish e d prod u ct. Ho we v[...]
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Revision 1.0 Page 18 of 25 User Guide 4.1.2.2 Audio interface The audio interfaces from the application board sh ould be used when using th e radio module as-is in a design. The audio interfaces are matched to the used aud io codec on the radio module. Using a d ifferen t codec or load on the interfaces requires redesig n of the audio interfaces. 4[...]
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Revision 1.0 Page 19 of 25 Headset Reference Design v1.0 4.2 USB dongle 4.2.1 Antenna The USB Dongle uses a PCB quarter wave ante nna. The USB Dongle is production ready , and any modi- fications to the antenna are only required as p art of the antenna tu ning process to compensate for plastic housing, and so on. If you want an ante nna redesign, a[...]
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Revision 1.0 Page 20 of 25 User Guide 5 Appendix 5.1 Bill Of Materials (BOM) T able 6. Application board BOM Part Designator Footpr int Description 10u C1 C3 C22 C27 SM/0805 Capacitor 0805/X5R/6V3/15% 10n C2 C4 C23 SM/0603 Capacitor 060 3/X7R/50V/10% 4.7u C1 1 C14 SM/0603 Capacitor 0603/X5R/6.3V/10% 100p C16 C1 7 SM/0603 Cap acitor 0603/NP0/50V/5% [...]
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Revision 1.0 Page 21 of 25 Headset Reference Design v1.0 T able 7. USB dongle BOM Part Designator Fo otprint Description 10n C1 C3 C4 C5 C6 C1 1 SM/0402 Cap acitor 0402/X7R/16V/10% 10u C2 C13 C22 SM/0805 Capacitor 0805/X5R/6V3/1 5% 1.0n C7 SM/0402 Capacitor 0402/X7R/50V/10% 33n C8 SM/0402 Capacitor 0402/X7R/16V/10% 4.7p C9 SM/0402 Capacitor 0402/NP[...]
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Revision 1.0 Page 22 of 25 User Guide T able 8. Radio mo dule BOM Part Designator Footprint Description 100n C1 C13 SM/0402 Cap acitor 0402/X7R/16V/10 % 22p C2 C5 SM/0402 Capac itor 0402/NP0/50V/5% 15p C3 C4 SM/0402 Capac itor 0402/NP0/50V/5% 4.7p C6 SM/0402 Capacitor 04 02/NP0/50V/5% 2.2n C7 SM/0402 Capacitor 04 02/X7R/50V/10% 1.0p C9 SM/0402 Capa[...]
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Revision 1.0 Page 23 of 25 Headset Reference Design v1.0 5.2 Application board schematics[...]
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Revision 1.0 Page 24 of 25 User Guide 5.3 RF module schematics KBD4 LED -RESET KBD0 KBD1 KBD2 KBD3 MOSI MISO SCK AIN AOUTP AOUTN VB VB VB VB VB VB VB VB Title Size Document Number Rev Date: Sheet of SCH-nRF24L01-VHR1-RM 4.0 RFmodule A4 11 Thursday, November 09, 2006 Schematic Title Size Document Number Rev Date: Sheet of SCH-nRF24L01-VHR1-RM 4.0 RF[...]
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Revision 1.0 Page 25 of 25 Headset Reference Design v1.0 5.4 USB dongle schematics -RESET SCK -RESET MOSI MISO 3V3 3V3 3V3 3V3 VUSB VUSB 3V3 3V3 3V3 3V3 3V3 3V3 3V3 3V3 Title Size Document Number Rev Date: Sheet of SCH-nRF24L01-VHR1-UD 4.0 USB Dongle A4 11 Thursday, November 23, 2006 SCHEMATIC1 Title Size Document Number Rev Date: Sheet of SCH-nRF2[...]