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http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 1 wenshing ?? ws - audio24 - 0005 - tx ws - audio24 - 0005 - r x wireless audio core module version history version date changes v1. 0 jul . 15 , 20 10 1 st . edition
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 2 content ? introduction.......... ......... ..... .................................................. .............. ................................3 ? 2. key features ............................................................................... .......... .......................4 ? 2.1 rf feature s:................................................................... ................ .....................4 ? 2.2 audio quality and interface......................................... ..................... ............ ......4 ? 2.3 general features:.............. .......................................... ......................... ...............4 ? 2.4 tx charging features (option) ........................................... ............... ................ 4 ? 3. applications .............................................. .................................... ................ ............ ....5 ? 4. block diagram.................................................................................. ........... .... ..... ......... 5 ? 4.1 ia2e ic block diagram................................ ................................. .............. ......... 5 ? 4.2 tx module............................................................................ ................ ................ 6 ? 4.3 rx module ............................................................. ............ ............. ..................... 6 ? 5. feature table:............................................................................... ............. ................... 7 ? 6. functional operation principle... .... .................................. .... .............. ......................... ..8 ? 6.1 audio interface............................................................. ................... ................... ..8 ? 6.1.1. analog audio - i 2 s interface ................................ .. ...... ... ............ ........... ..8 ? 6.1.2. usb device interface....................................... ......... ..... ..... .................. ...9 ? 6.2 rf operation principle ....................................... ........................... ...................1 0 ? 6.2.1 carrier freq uency separation..................... ............. ............ ....... ............1 0 ? 6.2.2 number of hopping frequencies ................................. .............. ...... ......1 0 ? 6.2.2.1 pseudorandom frequency hopping sequence..................... . . .... .1 0 ? 6.2.2.2 coordination of hopping seque nces to other transmitters .... .. . .....1 1 ? 6.2.2.3 system receiver hopping capability ...................................... . ....1 1 ? 6.2.2.4 equal hopping frequency use.................................. ...... ......... . ...1 1 ? 6.2.3 time of occupancy (dwell time)................................ ............. ........ ...... . 11 ? 6.3 charging operation principle (tx module option) .............. ................. ............1 2 ? 6.3.1 features ..................................... ......................... . .... ........................ .....1 2 ? 6.3.2 design reference circuit: as the below................ .......... ............ . ........1 2 ? 6.3.3 charging control flow chart .................................. ............... ..... . ........1 3 ? 7. pin definition................................................................ ...... .......... .................... .........1 6 ? 8. mechanical specification ............................................. .... ...... ...... ............................. 19 ? 9. phy sical .................................................................................. ............. .....................2 1 ? 1 0 . reference design.... .................... ......................................... ... ........ ...... .................. 23
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 3 1. intro duction ws - audio24 - 0005 - tx / ws - audio24 - 0005 - r x w ireless a udio core m odule is a highly integrated digital core module. by meaning of the intelligent wireless technology is developed by syncomm. it can provide high quality wireless audio for the users. supp orting multiple interfaces such as i2s, usb, embedded rf ic and other key blocks such as i2c control interface, voltage detector. ia2e wireless audio module provides dual transmitter and receiver modes, which enables the seamless transmission of high qual ity audio. in the transmitter, tx receives digitized stereo as input, which is packetized and processed for synchronization and data integrity. after that, the data are modulated and radiated at 2.4 ghz ism band. in the receiver, rx receives rf signal, d emodulated and processed to restore the transmitted signal, and then streamed as digital audio output.
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 4 2. key features 2.1 rf features ? worldwide 2.4 ghz ism band operation by 2406 mhz ~ 2472mhz. ? up to 2 mbps rf data rate ? gfsk modulation. ? long distance > 30m (line of sight) ? broadcasting mode ? rf frequency hopping in 34 channels ? embedded up/mac mode settings ia2e rf normal operation mode that support 15 hopping channel/per sequence. it i s included 4 sequence group/per system. det ails refer to the page.12 6.2 rf operation principle ? according fhss specification protocol. 2.2 audio quality and interface ? support compressed audio ? analog output: thd+n up to - 70db, snr up to 85db. ? support i 2 s (audio in/out) and usb (tx audio input) with 2 channels downstream. ? support i 2 s downstream 32/44.1/48khz at resolution of 16 bits (2 channels). ? ia2e wireless audio module that support in master mode for tx and rx audio interface. ? control channel (cch) up to 2 kbps for downstream by i 2 c interface via wireless. ? usb 1.1 device controller, supports lpcm and compressed format at 16 - bit 2 - channels at sampling frequency of 32, 44.1, and 48khz downstream. 2.3 general features ? programmable audio latency 20ms/50ms(default: ~40ms) ? integrated pipelined 8 - bit cpu, with embedded 4k bytes program ram, with embedded rfic in ia2e audio processor. ? serial 4k byte eeprom for boot register update. i 2 c interface support blank eeprom code download, external i 2 c device read/write, and data . 2.4 tx charging features (option) ? support rechargeable aaa size ni - mh battery for 900mah to 1000mah capacity by tx module internal charging circuit and firmware control.
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 5 3. applications ? wireless headphone ? wireless htib ? wireless mini - combo ? wireless outdoor speaker ? wirele ss audio sender 4. block diagram 4.1 ic block diagram
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 6 4.2 tx module 4.3 rx module
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 7 5. feature table
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 8 6. functional operation principle 6.1 audio interface 6.1.1. analog audio - i2s interface ia2e i 2 s audio interface can work for master and slave mode. in master mode, ia2e generate sysclk/lrck/bck for external audio codec. in slave mode, ia2e accept external sysclk/lrck/bck signal. ia2e will synchronize with external audio clock. master mode : the sysclk pin can generate 5 12 fs or 256 fs clock for external i 2 s components. table 6 - 1 shows system clock format. the sysclk can be set by firmware. table 6 - 1 i 2 s sample formats the support audio formats are 16 bits per sample. i 2 s formats. supported sampling fre quencies are 8, 32, 44.1 and 48khz. there are 32 bck bit clocks per left and right channel select lrck in both master mode or slave mode. the ia2e supported i 2 s sample and interface formats are listed in the tables 6 - 2/6 - 3 as below: table 6 - 2 i 2 s sampl e formats table 6 - 3 i 2 s interface formats for 1 channel modes, the audio is delivered on left channel of interface 0; for 2 channel modes, audio is on interface 0.this is recommended to set sampling rate at 48khz for master mode. slave mode : the i2s slave mode can only work for 48khz sampling rate. ia2e only need bck and lrck for i2s synchronization, the external sysclk is not required
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 9 6.1.2. usb device interface the usb device controller is universal serial bus specification revision 1.1 compli ant and supports universal serial bus device class definition for audio devices revision 1.0. in addition it implements endpoints for human interface device (hid). it supports one control endpoint, two isochronous - out endpoint, one isochronous - in endpoint, and one bi - directional interrupt - in endpoint. in addition to endpoint 0, there are three interfaces; interface 1 consists of 3 alternate settings for pcm or non - pcm audio of different sampling frequencies and number of channels; interface 2 consists of on e alternate setting for pcm audio input, while interface 3 consists of an alternate setting for hid control. the supported audio formats are linear pcm or non - pcm 32, 44.1 and 48 k hz sampling rate with 16 bits resolution at 2 channels for playback; and 8khz with 16bit resolution at 2 channels for recording. all data to/from the ia2e are transferred at full speed. the usb end point summary as followed: table 6 - 4 ia2e supports i 2 s interface formats
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 10 6.2 rf operation principle 6.2.1 carrier frequency s eparation according the fcc rules part 15 subpart c15.247 frequency hopping system shall have hopping channel carrier frequency separated by a minimum of 25 khz or 20db bandwidth of the hopping channel. channel separation 2 mhz @ per channel 6.2.2 number of hopping frequencies according the fcc rules part 15 subpart c15.247 frequency hopping systems operating in 2400~2483.5 khz band that meet 15 hopping frequencies. 6.2.2.1 pseudorandom frequency hopping sequence this module is controlled by microchip (ia 2e embedded up) to generate pseudorandom frequency hopping sequence. ia2e module rf normal operation mode support 15 hopping channel/per sequence. there are four hopping sequences list as below: sequence 1: 2406, 2420, 2422, 2424, 2426, 2428, 2444, 2446, 2448, 2450, 2452, 2456, 2468, 2470, 2472 mhz sequence 2 : 2406, 2408, 2410, 2412, 2414, 2416, 2418, 2420, 2422, 2424, 2426, 2428, 2430, 2438, 2446 mhz sequence 3: 2432, 2440, 2448, 2450, 2452, 2454, 2456, 2458, 2460, 2462, 2464,2466, 2468, 2470, 2472 mhz se quence 4: 2406, 2408, 2410, 2412, 2414, 2416, 2418, 2426, 2454, 2462, 2464, 2466, 2468, 2470, 2472 mhz the reference diagram drawing as below:
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 11 6.2.2.2 coordination of hopping sequences to other transmitters this transmitter does not have the abi lity of being coordinated with other fhss system for as soon as the transmitter is in operation, the gfsk of modulation of hopping frequency will follow the selected hopping sequence to transmit independently and no coordination is possible. especially, th is transmitter is used as a pc?s peripheral device, so no coordination of hopping frequency is required. 6.2.2.3 system receiver hopping capability there is one step to make the receiver to shift the frequency the frequencies in synchronization with trans mitter signals.when simultaneously press the ch/id button both tx module and id_led blinks by 0.25s on/off, id_learning process will continue 15s, and rx module longer than 3s, the id_learning will be enable, so the receiver will be able to shift the recei ving frequencies in synchronization with the transmitter signals. the reference diagram drawing as below : 6.2.2.4 equal hopping frequency use due to each the gfsk of modulation of hopping frequency will be transmitted in accordance to the frequency t ables described above, there is no any frequency will be able to hop more times than other. therefore each frequency will be used equally. 6.2.3 time of occupancy (dwell time) ia2e module operation frequency is in 2400 mhz ~ 2484.5mhz. in this band the a verage time of occupancy on any channel that required 0.4ms specification by multiplied by number of hopping channel employed. the ia2e module is on normal transmitting operation mode that time of occupancy is 3.84ms/per channel that according the 0.4ms sp ecification. (3.84ms/per channel)
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 12 6.3 charging operation principle (tx module option) 6.3.1 features ? support aaa 1.2v*2pcs (2.4v) ni - mh rechargeable battery, capacity 900mah ~1000mah only. ? automatic to judgment battery capacity for battery - recharge featu re. ? support full charge current by maximum 300ma and trickle charge by 50ma. ? required minimum charging dc power input voltage/current by 5v/500ma. ? support safety charging timer control. ? smart to judgment non - rechargeable battery. ? low cost charger function design. ? warning: the charger circuit that support ni - mh rechargeable battery only, if long times to charged non - chargeable battery (ex: alkaline battery. and so on) that will be damage ia2e charging circuit and battery . 6.3.2 design reference circuit: a s the below,
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 13 6.3.3 charging control flow chart: base on ni - mh 1.2v*2pcs (2.4v) voltage that have 3 mode charging flow , details flow reference below flow chart : mode 1: battery voltage > 2.55v
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 14 mode 2: battery voltage > 2.75v
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 15 mode 3 : battery voltage > 2.95v
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 16 7. pin definition tx module
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 17 rx module
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 18 8. mechanical specification ? dimension tx 40*40*7.1mm rx(4386) 35*35*7.1mm ? pcb 2 layers - tx & rx core module ? mechanical drawing fig 8.1 tx core module
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 19 fig 8.2 rx core module
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 20 9. physical fig 9.1. tx core module fig 9.2. rx core module
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 21 10. reference design fig 10.1 ground circuit
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 22 fig 10.2 rf_en trigger function
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 23 fig 10.3 vol/id_trigger/audio_sel design
http : //www.wenshing.com.tw ; http://www.rf.net.tw wireless audio core module data s heet p. 24 fig 10.4 charging led/ id_sync lec/id_set/rf_on audio led design fig 10.5 audio out for rca jack

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