박 유 진

 Short RF Range(~10m)  Reduce range by obstruction  Low data rate(1Mbps)  Normal Audio data rate : 1.5 Mbps  CD Quality Audio data rate : 2.0 Mbps 2

 Features  Reference Data  Fundamental Operation  Data Flow and Organization  Mode and Interface  Audio Transmitter(ATX)  Audio Receiver(ARX)  Common Block ATX and ARX  Operation Overview  Register Map  QoS(Quality of Service) Engine  Register update 3

 Low cost 0.18u CMOS, 36pin 6 x 6mm QFN Package, single chip RF Transceiver  4Mbps RF link  48ksps sample rate/16,24bit  Programmable latency  QoS engine for audio streaming  S/PDIF interface for PC Soundcard & surround receivers  I2S interface for glue-less audio support  SPI / 2wire interface 4

 On chip audio compression(24bit to 16bit)  On chip voltage regulator  Uses global 2.4GHz band  Application  CD quality headset  Speakers  Surround Speakers  Microphone  Etc… 5

ParameterValueUnit Minimum supply voltage2.0V Temperature range-20 to +80°C Peak supply current in transmit -5dBm output power 15mA Peak supply current in receive mode32mA Supply current in power down mode5mA Maximum transmit output power0dBm Audio sample rate8 to 48kSPS Audio resolution16Bit Receiver sensitivity-80dBm 6

 Two mode Operation  ATX(audio transmitter) mode  ARX(audio receiver) mode  Two data Channel  Audio Channel(audio Packet Transmission)  Control Channel(ACK Packet Transmission) 7

 nRF24Z1 data streaming principle 8

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 Data Packet(ATX)  16 stereo samples(SS).  Preamble, recipient address, Packet id, compression information, CRC  Control & register data (external devices connected to receiver can be controlled by input to the ATX)  ACK Packet(RTX)  Acknowledge information  Requesting retransmission packets  Control and status information 10

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 I2S(Inter-IC Sound) audio input  Consist of pins CLK, DATA and WS  Sample rates : 8, , 12, 16, 22.05, 24, 32, 44.1, 48 kSPS  16 / 24 bit format  S/PDIF(Sony/Philips Digital Interconnect Format) audio input  Input on pin SPDIO  Sample rates : 32, 44.1, 48kSPS  16 / 20 / 24 bit format -> 16 bit compression  IEC958 type2,3 13

 Slave interface  MCU connected to Slave interface  SPI(SSEL =0), 2-wire(SSEL =1)  Master interface  EEPROM or FLASH memory connected to master interface  Support SPI or 2-wire  If a memory is present, device read configuration data from the memory 14

 Direct data input pin  Digital input(GPIO) DD[1:0]  If SSEL = 1(2-wire) DD[2:0]  Interrupt output  IRQ based interrupt(i.e. no audio input detected, loss of RF communication etc.) 15

 GPIO interface( No MCU) 16

 Slave interface(Use MCU) 17

 I2S audio output  8,11.025, 12, 16, 22.05, 24, 32, 44.1, 48 kSPS  16 bit format  S/PDIF audio output  32, 44.1, 48 kSPS  16/24 bit format 18

 Slave interface  MCU connected to Slave interface  SPI(SSEL =0), 2-wire(SSEL =1)  Master interface  EEPROM or FLASH memory connected to master interface  Support SPI or 2-wire  If a memory is present, device read configuration data from the memory  After link established, audio transmitter can control Master interface(SPI) 19

 Parallel port  Alternatively to the serial slave interfaces  4 input port DI[3:0]  4 output port DO[3:0]  provide a PWM signal(DO[3:0]) 20

 XTAL Oscillator(16MHz)  Radio Transceiver  high speed streaming(4Mbps) transceiver interface  2.4GHz ShockBurst™ Transceiver  QoS(Quality of Service) engine control output power  Power supply regulator  Audio compression / decompression  24bit sample to be compressed to a 16bit format  Removing the LSB in the sample 21

 Power on – reset  If external memory is present, configuration data is loaded from external memory(API / 2 wire)  If no external memory is present, external MCU must configure nRF24Z1 through the slave SPI or 2-wire serial interface 22

 Link locate state  Initialization or ATX and ARX link Broken  ATX sending short search packet on all channel until an acknowledge signal received from ARX  ARX listening for incoming search packet on all channel 23

 Synchronization state  If RF link established between ATX and ARX, synchronize the frequency hopping engine on ATX and ARX(hopping sequence)  Idle state  If RF link established and synchronized, nRF24Z1 enter idle state 24

 I2S interface  Left justified  I2S  Right justified  S/PDIF interface  Linear PCM Audio as described in IEC (2 channel Stereo)  Non-Linear PCM Audio as described in IEC and IEC (Surround Channel Stereo) 25

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 Register map in external EEPROM  Minimum EEPROM size : 128 bytes  Must be put in EEPROM byte n+3 28

 Ensure robust communication in an audio streaming application  RF protocol features  Data Frame consist of RF address, payload, CRC  Packet loss or received with error, retransmitted from ATX in the next frame  Use Adaptive Frequency Hopping Algorithm  Management RF link  Monitoring RF link constantly  If lost link, run a link initialization or reconnect 29

 Part of QoS engine functionality  Frequency Hopping table 30

 Link Quality monitoring 31

 Latency  Output power 32

 Deliver interrupt to any external system connected to pin IRQ  INTSTA : interrupt flag Register  INTCF : interrupt configure Register  Available interupt  Link Broken  Poor link  Link error  Remote transfer done  GPIO change  Wakeup from power down 33

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 ATX MCU can update audio receiver control register via the control channel  TXCSTATE : Send ATX register to ARX via control channel  LNKCSTATE : Send LINK control register to ARX via control channel  RXCSTATE : Send ARX status register to ARX via control channel  RXEXEC : Sent RXBUF to ARX via serial interface  After transfer done, remote transfer done interrupt flag will be set. 35

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