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asahi kasei [AK5370] ms0027-e-00 1 2000/05 general description the AK5370 is ad converter for usb audio, especially usb microphone . the AK5370 integrates usb serial interface engine, usb transceiver, audio class decoder, endpoints, and high quality ad converter into t he chip. as the AK5370 incorporates pll, it can support several sampling frequencies, 8khz, 11.025khz, 22.05khz, 44.1khz, and 48khz with only one crystal. moreover, the AK5370 integrates volume control, and mute function. it is possible to make usb microphone with a few external components this device is good for not only business application such as conferencing but also games , voice recognition, and karaoke. related documents for the detail of usb specification, and audio class, please refer to the following documents. universal serial bus specification revision 1.1 universal serial bus device class definition for audio devices, revision 1.0 features: n incorporates usb audio controller usb serial interface engine audio class encoder/decoder 2 endpoints (fifo) usb transceiver n 16 bit a/d converter 1 channel mute/volume control agc pin for external control a/d s/n: 84dba (44.1khz, gain = 0db) n on-chip pll 5 sampling frequencies support 8khz, 11.025khz 22.05khz, 44.1khz, 48khz n programmable gain amplifier +20db to C58db n single power supply, low power +3.3volts 10% n package 24pin vsop va lflt1 amp1o mic_in endpoint1 in_fifo agnd vd 16bit adc dgnd dn dp mute & volume control endpoint0 in_fifo endpoint0 out_fifo common voltage audio class decoder audio class encoder serial interface engine xtlin xtlout vcom usb transceiver pll adclk system clk crystal amp2o amp2i - + - + power management mic_bias config rom agc rst agcen string rom testmode1,2 test1,2,3 lflt2 vref AK5370 usb i/f a/d converte r
asahi kasei [AK5370] ms0027-e-00 2 2000/05 pin/function no. signal name i/o ana / dig description 1 dgnd p d digital ground 2 vd p d digital power supply, 3.3v 3 dp i/o d usb bus non-inverting pin. because AK5370 is full speed mode device, 1.5k w resistor will be connected between d+ node to vd. 4 dn i/o d usb bus inverting pin. 5 testmode3 i d please tie down to agnd for normal operation. 6 xtalout o a crystal oscillator output, connect crystal resonator 7 xtalin i a crystal oscillator input, connect crystal resonator 8 testmode2 i a please tie down to agnd for normal operation. 9 lflt2 o a system clock pll loop filter pin. connect 18k w resistor and 6800pf capacitor in series externally. 10 lflt1 o a adpll loop filter pin. connect 51k w resistor and 8200pf capacitor in series externally. 11 vcom o a analog common voltage reference pin 12 micin i a microphone input 13 amp1o o a 1 st amplifier output pin 14 amp2i i a 2 nd amplifier input pin 15 va p a analog power supply, 3.3v 16 agnd p a analog ground 17 vref o a adc common voltage reference pin. 18 amp2o o a 2 nd amplifier output pin 19 testmode1 i a please tie down to agnd for normal oper ation. 20 micbias o a voltage reference output for the microphone?s bias voltage when this chip goes into suspend mode, this pin goes to hi -z. 21 test i d please tie down to agnd for normal operation. 22 agce i d agc enable control input pin. when the external agc is used, high level should be applied to this pin. when low input is applied, agc configuration rom data is set false. then agc output is set to low. 23 agc o d agc control pin when the host requests set agc_control request, this pin goes to ?h?. ?l? level agce input prevents this agc_control request. low level output at suspend. default output at reset is low. 24 rstn i d reset pin, low input makes the chip reset sate. schmitt trigger input.
asahi kasei [AK5370] ms0027-e-00 3 2000/05 absolute maximum rating agnd, dgnd=0v parameter symbol min max units power supplies analog digital |dgnd-agnd| va vd d gnd -0.3 -0.3 4.5 4.5 0.3 v v v input current (any pins except for supplies) iin - 10 ma analog input voltage vina -0.3 va+0.3 v digital input voltage vind -0.3 vd+0.3 v ambient temperature ta 0 70 c storage temperature tstg -40 125 c note 1. all voltages with respect to ground warning: operation at or beyond these limits may results in permanent damage to the device. n ormal operation is not guaranteed at these extremes. recommended operating condition agnd, dgnd=0v parameter symbol min typ max units power supplies analog digital va vd 3.0 3.0 3.3 3.3 3.6 3.6 v v all voltages with respect to grou nd. * akm assumes no responsibility for the usage beyond the condition in this datasheet.
asahi kasei [AK5370] ms0027-e-00 4 2000/05 analog characteristics ta=25 c, va=vd=3.3v, signal frequency=1khz, sampling frequency fs=44.1khz parameter min typ max units mono adc (1 channel) resolution 16 bits s/n (a weight) (1 st and 2 nd mic amplifier are set to 0db) 76 84 dba s/(n+d) (-0.5db analog input) (1 st and 2 nd mic amplifier are set to 0db) 62 70 db mic amplifier (2 nd stage) characteristics input voltage 1.6 vp-p gain control range -58 20 db step size 0 1.0 2.0 db input impedance @amp2i pin 20 k w mic amplifier(1 st stage) gain range(defined by external resistors) 0 +20 db external feedback impedance 20 k w mic bias output voltage when 4.7k w resistor connected 0.9va vdc output impedance 200 500 w output current 3 ma power supplies analog digital total power down(suspend mode) 10.5 8.5 4.7 30 ma ma ma ma filter characteristics (ta=25 c va, vd =3.0 - 3.6 v ; fs = 44.1 khz) parameter symbol min typ max units a/d digital filter (decimation lpf) passband +/- 0.2 db pb 0 17.64 khz stopband sb 26.5 khz passband ripple pr +/- 0.2 db stopband attenuation sa 68 db group delay gd 0.5 ms a/ddigital filter (hpf) frequency response -3 db -0.5 db -0.1 db fr 6.85 19.2 44.9 hz hz hz
asahi kasei [AK5370] ms0027-e-00 5 2000/05 digital dc characteristics ta=0 - 70 c; vd=3.0 - 3.6v; dgnd=0v measurement under static state all digital pins except dp, dn. schmitt hysteresis level of rst pin and levels of all test pins will not be tested. parameter symbol min typ max units agce pin ?h? level input voltage vih 70%va v agce pin ?l? level input voltage vil 30%va v rstn pin ?h? level voltage vihr 2.0 v rstn pin ?l? level voltage vilr 0.8 v ?h? level output voltage ioh= 2ma voh 2.4 v ?l? level output voltage iol= -2ma vol 0.6 v input leakage current iin 10 m a switching characteristics ta=25 c, va=vd=3.3v parameter symbol min typ max units master clock frequency mclk - 11.2896 - mhz reset input width @rstn pin(low active) wrst 1.0 us singe ended receiver threshold vse 0.8 2.0 v main clock stable time vse(max) of d+ to stabilized mclk ( x?tal oscillator start up + pll lock -in ) tostb 100 ms reset signal recognition both d+ and d- < vse(min) to reset mode trst_rec 2.5 5.5 m s device ready ready for transaction after reset tdrr 10 ms suspend recognition idle state ( d+ > vse(max) & d - < vse(min) ) to suspend mode tsus_rec 3.0 ms resume time first flip of d+/d- from idle sate to device ready*) tresm 30 ms device ready: vref, x?tal oscillator, and pll get stable and bus trans action with normal rate is ready. master clock d- "l" d+ vd t rst_rec reset mode device connected rst reset mode tostb tdrr figure 1. mode change with respect to bus states 1 (power on and device connected)
asahi kasei [AK5370] ms0027-e-00 6 2000/05 master clock d- d+ vd?h? tresm tsus_rec rst?h? figure 2. mode change with respect to bus states 2 (bus transactions) transmitter characteristics ta=25 c; vd=3.3v; dgnd=0v; cl=50pf parameter symbol pins conditions min typ max units data rate dr dp,dn 11.97 12 12.03 mhz output impedance (hi) roh dp, dn dp, dn=?h? 30 w output impedance (lo) rol dp, dp dp, dn=?l? 30 w ?h? level output voltage vohd dp, dn ioh=-200ua 2.8 v ?l? level output voltage vold dp, dn ioh=2.2ma 0.3 v tri-state leakage current iolk dp, dn 0 < dp, dn< 3.3v -10 10 m a rise/fall time trf/tff dp, dn 4 12 20 ns rise/fall time matching trfm dp, dn 100 % crossover point vcrs dp, dn 1.6 v 10%vdd 90%vdd t rs t rf dp, dn t fs t ff figure 3. rise/fall time vcrs dp, dn figure 4. crossover point
asahi kasei [AK5370] ms0027-e-00 7 2000/05 receiver characteristics ta=25 c; vd=3.3v; dgnd=0v parameter symbol pins conditions min typ max units schmitt high level voltage vihs dp, dn 2.0 v schmitt low level voltage vils dp, dn 0.8 v vils vihs dp, dn figure 5. schmitt level voltage
asahi kasei [AK5370] ms0027-e-00 8 2000/05 n overview of AK5370 the AK5370 is the advanced a/d converter, which converts analog signal of condenser microphone into usb audio class formats. t his device is suitable for usb microphone. the AK5370 includes the following blocks: 1. ad converter 2. pre-amplifier with variable gain/attenuation 3. serial interface engine 4. control block of audio device class support mute, gain/attenuation, sampling frequency control, and agc (only decode the request) 5. usb transceiver ak4170 compliant 6. fifo memory for bus synchronization memory size (16bit wide x 100 depth) 7. pll synchronize audio stream data with usb bus i/f the AK5370 supports 5 sampling frequencies (8khz, 11.025khz, 22.05khz, 44.1khz, 48khz) mute control, volume control of feature unit in audio device class. in addition to this, as the AK5370 decodes the agc request, and puts h or l level to the exter nal pin, agc pin, it is easy to implement agc with external circuit. in order to support these frequencies, the AK5370 incorporates pll. in addition to this, as the AK5370 consumes low power, it is possible to operate as bus-powered device. n class & descriptor overview usb peripheral usually belongs to a group, class. the AK5370 belongs to audio device class. the class consists of four descriptors, device descriptor, configuration descriptor, interface descriptor, and endpoint descriptor. the AK5370 has audio specific interface descriptor and endpoint descriptor. (1) device descriptor device descriptor describes the product information; product name, manufacturer, etc. in addition to this, device descriptor h as endpoint0 fifo-buffer size. at enumeration phase, host reads 8 bytes from the top of device descriptor at first. the host kno ws by reading bmaxpacketsize0 in the device descriptor, and uses this value for the following transactions, and does not send the bigger data at once. (2) configuration descriptor configuration descriptor informs the host of the number of interface, bus-powered/self-powered device, etc. this descriptor is the same as standard interface descriptor. (3) interface descriptor there are two interfaces in audio class; audio control (ac) interface, and audio streaming (as) interface. each audio interface includes standard interface descriptor and class-specific interface. standard ac interface descriptor describes interfaces class. class-specific ac interface descriptor is a concatenation of all the descriptors that are used to fully describe the audio func tion. as the AK5370 has three logical audio functions; input terminal, output terminal, and feature unit (mute, volume, agc), each terminal and unit has their own descriptor. not only each descriptor has their own information, but also has connection information between the blocks. for example, bsourceid field in output terminal descriptor is 0x03, which is id of feature unit. this means that feature unit is connected to output terminal. standard as interface has the interface class name (audio) and sub-class name (audio_streaming), the related endpoint number, etc. class-specific as interface descriptor mainly shows audio data format information that follows as descriptor. there is a note for alternate setting: alternate setting 0 is a zero-bandwidth setting, used to relinquish the claimed bandwidth on the bus when the microphone is not in use. it is the default setting after power-up. the zero bandwidth is implemented by specifying that this alternate setting of the inter face has no endpoints associated with it (bnumendpoints=0). (4) endpoint descriptor
asahi kasei [AK5370] ms0027-e-00 9 2000/05 endpoint descriptor is a pipe for the data. the AK5370 has two endpoints. one is endpoint0 for control transfer. another is endpoint 1, whose direction is in, is used for isochronous transfer. standard as isochronous endpoint tells endpoint type like in/out, maximum packet size, synchronization type, etc. to the host. main information of class-specific as endpoint descriptor is sampling frequency. figure 6 shows descriptors hierarchy. configuration descriptor device descriptor standard audio control interface descriptor class-specific audio control interface descriptor standard as interface descriptor alt. setting 0 class-specific as format type descriptor standard as isochronous endpoint descriptor class-specific as isochronous endpoint descriptor standard as interface descriptor alt. setting 1 class-specific audio streaming interface descriptor standardinterface descriptor class-specific descriptor interface endpoint (in) configuration device figure 6. descriptor hierarchy
asahi kasei [AK5370] ms0027-e-00 10 2000/05 n synchronization the AK5370 operates as asynchronous device. a/d converter in the AK5370 operates asynchronously with usb sof timing. the data from a/d converter are sent continuously to a buffer memory while the data are burstly transferred at the interval of sof on the usb. in order to control the difference of timing, AK5370 has a fifo memory with a capacity of 2-frame depth .the average sampl ing rate calculating from usb frame should be in accordance with a/d sampling rate (fs). the following figure shows an example. when sampling frequency is set to 44.1khz, the number of data is almost 44 samples in on e frame. but the AK5370 must send 45 samples in once per ten times. please see figure 7 . 44 samples 44 samples 45 samples n frame (n+1) frame (n+9) frame 44 samples (n+10) frame figure 7. synchronization the data sampled by a/d converter in n frame are output to the usb bus on somewhere the (n+1) frame by issuing in transfer. n power management control in the normal operation, micbias outputs the voltage to supply the microphones bias voltage. when idle state continues for 3ms, the AK5370 goes to suspend state and forces adc block and other unnecessary block to power-d own mode. micbias pin does not supply the bias voltage to save power consumption and is open state under suspend state. the device resumes the normal operation within 30ms after the device receives resume signal n feature unit control & frequency control the AK5370 has three feature unit function; mute, volume, and agc. the host issues set_feature_unit_control request to change the volume, the status of mute or agc. the AK5370 responds to the request for cur value only, not respond for min, max, res value. note that the AK5370 doesnt have agc circuit itself a nd that it decodes agc request only. the host can get the cur/max/min/res value of the volume by requesting get_feature_control. however, only cur value is supported for mute and agc. volume control format of usb audio class is a) 16-bit integer, b) upper-bye is integer (-127 to 127), and lower-bye is fraction . the AK5370 follows the conversion table described in table 1 in page 22 for the volume control request when the AK5370 receives set_endpoint_control request, it changes sampling frequency(fs). if fs is not supported, the device forces to set the appropriate fs which it supports. the host can get fs by issuing get_endpoint_control request.
asahi kasei [AK5370] ms0027-e-00 11 2000/05 AK5370 descriptors specification 1. product description this device is one channel 16-bit adc with usb i/f for monaural microphone, and operates as in device. 2. descriptor structure this device includes one configuration, two interfaces, which are an audio control interface (0) and an audio streaming interface (1) , two endpoints, which are endpoint 0 for default pipe, and endpoint 1 for audio streaming. the descriptor is partly fixed and partly programmable by means of selectable test pin map. the programmable descriptors are marked with a star. 3. device descriptor offset field size value description 0 blength 1 0x12 size of this descriptor in bytes 1 bdescriptor type 1 0x01 device descriptor 2 bcdusb 2 0x0110 1.10 ? current revision of usb spec. 4 bdeviceclass 1 0x00 device defined at interface level 5 bdevicesubclass 1 0x00 unused 6 bdeviceprotocol 1 0x00 unused 7 bmaxpacketsize0 1 0x08 8 bytes 8 idvendor 2 0x0556 akm?s v endor id 10 idproduct 2 0x0001 00 means audio product, 01 is akmproduct id , 12 bcddevice 2 0x0001 device release code 14 imanufacturer 1 0x01 ?akm? 15 iproduct 1 0x02 ?AK5370? 16 iserialnumber 1 0x00 unused 17 bnumconfigurations 1 0x01 one configuration 4. configuration block the configuration block consists of a confi guration descriptor followed by interface, endpoint, and class-specific descriptors. 4.1 configuration descriptor offset field size value description 0 blength 1 0x09 size of this descriptor 1 bdescriptor type 1 0x02 configuration descriptor 2 wtotallength 2 0x0076 length of entire configuration block total 118 bytes including this interface descriptor. 4 bnuminterfaces 1 0x02 two interfaces 5 bconfiguration value 1 0x01 index of this configuration 6 iconfiguration 1 0x00 null string 7 bmattributes 1 0x80 bus powered device 8 maxpower 1 0x2d power consumption:90ma
asahi kasei [AK5370] ms0027-e-00 12 2000/05 4.2 audio control interface the audio control interface describes the device structure and is used to manipulate the audio controls. 4.2.1 interface descriptor this descriptor describes a standard interface which includes usb class code and the index to class-specific information. offset field size value description 0 blength 1 0x09 size of this descriptor 1 bdescriptor type 1 0x04 interface descriptor 2 binterfacenumber 1 0x00 index of this interface 3 balternatesetting 1 0x00 index of this setting 4 bnumendpoints 1 0x00 endpoint 0 5 binterfaceclass 1 0x01 audio 6 binterfacesubclass 1 0x01 audio_control 7 binterfaceprotocol 1 0x00 unused 8 iinterface 1 0x00 null string 4.2.2 class-specific interface header descriptor contains general information about the audio device. offset field size value description 0 blength 1 0x09 size of this descriptor 1 bdescriptor type 1 0x24 cs_inter face 2 bdescriptorsubtype 1 0x01 header subtype 3 bcdadc 2 0x0100 revision of class specification ? 1.0 5 wtotallength 2 0x0026 total size of class-specific audio control interface descriptors (includes this descriptor) 7 bincollection 1 0x01 number of streaming interfaces 8 bainterfacenr(1) 1 0x01 streaming interface number 1 belongs to this audio control interface. 4.2.3 input terminal descriptor this descriptor describes the signal coming through the input port numchannels is 1(monaural) and channelconfig is set no position. terminal type is microphone. offset field size value description 0 blength 1 0x0c size of this descriptor 1 bdescriptor type 1 0x24 cs_inter face 2 bdescriptorsubtype 1 0x02 input_terminal subtype 3 bterminalid 1 0x01 id of this terminal 4 wterminaltype 2 0x0201 terminal is microphone 6 bassocterminal 1 0x02 id of associated output terminal is 0x02 7 bnrchannels 1 0x01 one channel (monaural) 8 wchannelconfig 2 0x0000 mono sets no position bits 10 ichannelnames 1 0x00 unused 11 iterminal 1 0x00 unused 4.2.4 output terminal descriptor this descriptor describes the usb stream to host. offset field size value description 0 blength 1 0x09 size of this descriptor 1 bdescriptor type 1 0x24 cs_inter face 2 bdescriptorsubtype 1 0x03 output_terminal subtype 3 bterminalid 1 0x02 id of this terminal 4 wterminaltype 2 0x0101 usb streamer 6 bassocterminal 1 0x01 id of associate input terminal is 0x01 7 bsourceid 1 0x03 from feature unit 8 iterminal 1 0x00 unused
asahi kasei [AK5370] ms0027-e-00 13 2000/05 4.2.5 feature unit descriptor this descriptor describes m ute control, volume control and automatic gain control(agc) . offset field size value description 0 blength 1 0x08 size of this descriptor 1 bdescriptor type 1 0x24 cs_inter face 2 bdescriptorsubtype 1 0x06 feature_unit descriptor subtype 3 bunitid 1 0x03 id of this feature unit 4 bsourceid 1 0x01 id to terminal to which this is connected. 5 bcontrolsize 1 0x01 size in bytes of an element of the bmacontrol() 6 bmacontrols(0) 1 0x43* d0(mute), and d1(volume) , d6(agc) is enable 7 ifeature 1 0x00 unused *) when l level is applied to agce pin, bmacontrol (0) data is modified to 0x03 to state agc is not enable. note that there is never endpoint descriptor for endpoint 0.
asahi kasei [AK5370] ms0027-e-00 14 2000/05 4.3 audio streaming interface 4.3.1 zero bandwidth interface descriptor offset field size value description 0 blength 1 0x09 length of this descriptor 1 bdescriptor type 1 0x04 interface descriptor 2 binterfacenumber 1 0x01 index of this interface 3 balternatesetting 1 0x00 index of this setting 4 bnumendpoints 1 0x00 endpoints 0 5 binterfaceclass 1 0x01 audio 6 binterfacesubclass 1 0x02 audio_streaming 7 binterfaceprotocol 1 0x00 unused 8 iinterface 1 0x00 null string 4.3.2 interface descriptor offset field size value description 0 blength 1 0x09 length of this descriptor 1 bdescriptor type 1 0x04 interface descriptor 2 binterfacenumber 1 0x01 index of this interface 3 balternatesetting 1 0x01 index of this setting 4 bnumendpoints 1 0x01 endpoint 1 5 binterfaceclass 1 0x01 audio 6 binterfacesubclass 1 0x02 audio_streaming 7 binterfaceprotocol 1 0x00 unused 8 iinterface 1 0x00 null string 4.3.3 class-specific audio streaming interface descriptor offset field size value description 0 blength 1 0x07 length of this descriptor 1 bdescriptor type 1 0x24 cs_interface descriptor 2 bdescriptorsubtype 1 0x01 as_general 3 bterminallink 1 0x02 unit id of terminal(output terminal id) 4 bdelay 1 0x01 interface delay 5 wformattag 2 0x0001 pcm 4.3.4 type i format type descriptor offset field size value description 0 blength 1 0x17 size of this descriptor 1 bdescriptor type 1 0x24 cs_inter face 2 bdescriptorsubtype 1 0x02 format_type 3 bformat type 1 0x01 format_type_i 4 bnrchannels 1 0x01 one channel 5 bsubframesize 1 0x02 two bytes per slot 6 bbitresolution 1 0x10 16 bits 7 bsamfreq type 1 0x05 five frequencies 8 tsamfreq[0] 3 0x001f40 8000hz 11 tsamfreq[1] 3 0x002b11 11025hz 14 tsamfreq[2] 3 0x005622 22050hz 17 tsamfreq[3] 3 0x00ac44 44100hz 20 tsamfreq[4] 3 0x00bb80 48000hz
asahi kasei [AK5370] ms0027-e-00 15 2000/05 4.4 endpoint descriptor 4.4.1 standard endpoint descriptor offset field size value description 0 blength 1 0x07 length of this descriptor 1 bdescriptor type 1 0x05 endpoint descriptor 2 bendpointaddress 1 0x81 endpoint 1, in direction 3 bmattributes 1 0x01 isochronous, asynchronous, not shared 4 wmaxpacketsize 2 0x0064 2byte*50sample*1ch=100 byte/frame 6 winterval 1 0x01 one packet every frame (must be set to 1) 4.4.2 class-specific isochronous audio data endpoint descriptor offset field size value description 0 blength 1 0x07 size of this descriptor 1 bdescriptor type 1 0x25 cs_endpoint 2 bdescriptorsubtype 1 0x01 general 3 bmattributes 1 0x01 sample rate control 4 blockdelayunits 1 0x00 unused 5 wlockdelay 2 0x0000 4.5 string descriptor 1 string descriptors use unicode. except for langi d. 4.5.1 langid (0x00) field offset field size value description 0 blength 1 0x04 length of this descriptor 1 bdescriptor type 1 0x03 string descriptor 2 bstring 2 0x0409 ?english(us)? 4.5.2.1 imanufacterer (0x01) field in device descriptor offset field size value description 0 blength 1 0x022 length of this descriptor 1 bdescriptor type 1 0x03 string descriptor 2 bstring 6 0x0041 0x004b 0x004d 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 ?akm ?
asahi kasei [AK5370] ms0027-e-00 16 2000/05 4.5.3.1iproduct (0x02) field in device descriptor offset field size value description 0 blength 1 0x22 length of this descriptor 1 bdescriptor type 1 0x03 string descriptor 2 bstring 12 0x0041 0x004b 0x0035 0x0033 0x0037 0x0030 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 ?AK5370 ?
asahi kasei [AK5370] ms0027-e-00 17 2000/05 5. standard requests 5.1 clear feature the AK5370 accepts ?clear feature? request without stall. though this request does not influence to the operation of the device, the AK5370 does not support this request. 5.2 get configuration akm usb microphone should return the value, one, to the host. offset field size value description 0 bmrequest type 1 0x80 1 brequest 1 0x08 get_configur ation 2 wvalue 2 0x0000 4 windex 2 0x0000 6 wlength 2 0x0001 akm usb mic. has one configuration. 5.3 get descriptor offset field size value description 0 bmrequest type 1 0x80 1 brequest 1 0x06 get_descriptor 2 wvalue 2 0xzzzz zzzz is assigned by host: high byte is descriptor type, low byte is index. device : 0x0100 : (index is 0 only) configuration : 0x0200 string: 0x03??(?? is 00, 01, 02) 4 windex 2 0x0000 if wvalue is device or configuration, windex is zero. if wvalue is 0x0300(langid), windex is zero. if wvalue is 0x0301 or 0x0302, windex is 0x0409. 6 wlength 2 0xzzzz descriptor length (zzzz is assigned by host) 5.4 get interface akm usb microphone has alternate audio streaming interface, ;zero bandwidth, and normal. so, the device returns the current selected balternatesetting v alue, 0x00(zero bandwidth audio streaming interface) or 0x01(normal audio streaming interface). if windex is ?0? (audio control interface), the device returns the value, ?0x00. offset field size value description 0 bmrequest type 1 0x81 1 brequest 1 0x0a get_inter face 2 wvalue 2 0x0000 zero 4 windex 2 0x0000 0x0001 audio control interface audio streaming interface 6 wlength 2 0x0001 akm usb mic. has zero bandwidth audio streaming interface and normal audio streaming interface.
asahi kasei [AK5370] ms0027-e-00 18 2000/05 5.5 get status offset field size value description 0 bmrequest type 1 0x80 0x81 0x82 device inter face endpoint 1 brequest 1 0x00 get_status 2 wvalue 2 0x0000 zero 4 windex 2 6 wlength 2 0x0002 the akm usb mic returns the following status. a) device : 0x00 ( akm usb m ic is bus-powered device) b) interface: 0x00 (all zero) c) endpoint : 0x00 5.6 set address akm usb mic stores the wvalue in the internal memory as device address. in addition to this, the device returns ack. offset field size value description 0 bmrequesttype 1 0x00 zero 1 brequest 1 0x05 set_address 2 wvalue 2 0xzzzz device address : zzzz is assigned by host 4 windex 2 0x0000 zero 6 wlength 2 0x0000 zero 5.7 set configuration akm usb mic is placed to configured state only wvalue of this request is 0x00 01. in addition to this, the device returns ack. offset field size value description 0 bmrequest type 1 0x00 zero 1 brequest 1 0x09 set_configur ation 2 wvalue 2 0x0000 0x0001 others unconfigured state akm usb mic is set to configured state unconfigured state 4 windex 2 0x0000 zero 6 wlength 2 0x0000 zero
asahi kasei [AK5370] ms0027-e-00 19 2000/05 5.8 set feature the AK5370 accepts ?set feature? request without stall. however note that the AK5370 does not support this request. 5.9 set interface this request selects the alternate setting on interface 1 to control bandwidth allocation. only 0x0000 is selected if windex is 0x0000 (audio control interface) as current interface. offset field size value description 0 bmrequest type 1 0x01 one d7 0 = host to device d6..5 0 = standard request d4..0 1 = recipient is interface 1 brequest 1 0x0b set_inter face 2 wvalue 2 0x0000 0x0001 alternate setting control interface or zero bandwidth of streaming interface normal streaming 4 windex 2 0x0000 0x0001 audio control interface audio streaming interface 6 wlength 2 0x0000 zero 5.10 synch frame as akm usb microphone does not support this request , pipe is stalled.
asahi kasei [AK5370] ms0027-e-00 20 2000/05 6. device specific requests akm usb microphone supports only set_cur as brequest field in set request values. 6.1 audio control request akm usb microphone support only feature unit control request, not support other requests. addition to this, it only supports set_cur value as brequest field in set feature unit control request values. all audio control requests are applied to channel 0, which means master channel. 6.1.1 set feature unit control request akm usb microphone supports only one form of parameter block. a) mute control offset field size value description 0 bmrequest type 1 0x21 1 brequest 1 0x01 set_cur 2 wvalue 2 0x0100 mute_control | channel_ 0 4 windex 2 0x0300 upper byte : bunit id field in feature unit descriptor.(0x03) lower byte : audio control interface(0x00) 6 wlength 2 0x0001 the length of mute control parameter block the parameter block of mut e control is the following. offset field size value description 0 bmute 1 0x01 0x00 true false b) volume control offset field size value description 0 bmrequest type 1 0x21 1 brequest 1 0x01 set_cur 2 wvalue 2 0x0200 volume_control | channel_ 0 4 windex 2 0x0300 upper byte : bunit id field in feature unit descriptor.(0x03) lower byte : audio control interface(0x00) 6 wlength 2 0x0002 volume control the parameter block of mute control is the following. offset field size value description 0 wvolume 2 0xzzzz the value is mapped to the volume register value. (refer to figure 3 conversion table ) zzzz is assigned by the host if the wvolume exceeds the range, the AK5370 forces the value into the range. please see the conversion table in the get feature unit control request. c) automatic gain control offset field size value description 0 bmrequest type 1 0x21 1 brequest 1 0x01 set_cur 2 wvalue 2 0x0 700 autom atic_gain_control | channel_0 4 windex 2 0x0300 upper byte : bunit id field in feature unit descriptor.(0x03) lower byte : audio control interface(0x00) 6 wlength 2 0x0001 the length of mute control parameter block the parameter block of mute control is the following. offset field size value description 0 bagc 1 0x01 0x00 true (agc pin is ?h?) false (agc pin is ?l?: default)
asahi kasei [AK5370] ms0027-e-00 21 2000/05 6.1.2 get feature unit control request akm usb microphone supports only one form of parameter block. a) mute control offset field size value description 0 bmrequest type 1 0xa1 1 brequest 1 0x81 get_cur 2 wvalue 2 0x0100 mute_control | channel_ 0 4 windex 2 0x0300 upper byte : bunit id field in feature unit descriptor.(0x03) lower byte : audio control interface(0x00) 6 wlength 2 0x0001 the length of mute control parameter block the device outputs the current setti ng of mute status. offset field size value description 0 bmute 1 0x01 0x00 true false b) volume control offset field size value description 0 bmrequest type 1 0xa1 1 brequest 1 0x81 0x82 0x83 0x84 get_cur get_min get_max get_res 2 wvalue 2 0x0200 volume_control | channel_ 0 4 windex 2 0x0300 upper byte : bunit id field in feature unit descriptor.(0x03) lower byte : audio control interface(0x00) 6 wlength 2 0x0002 volume control the parameter block of volume control is the following. offset field size value description 0 wvolume 2 0xzzyy 0xc600 0x1400 0x0100 brequest = get_cur : returns current volume. yy must be 00h brequest = get_min : -58db brequest = get_max : +20db brequest = get_res : 1.0db table 1 is the conversion map of usb class and internal volume register. when host requests the volume value which is larger than the max value in the device, the device sets the max value to the volume. when host requests the volume value which is smaller than the min value in the device, the device sets the min value to the volume. res value is 1.0db.
asahi kasei [AK5370] ms0027-e-00 22 2000/05 field wvolume value step 0x7fff 20.0000 -------- --------- 0x1400 20.0000 0x13ff 19.0000 --------- -------- 0x1301 19.0000 0x1300 19.0000 0x12ff 18.0000 --------- -------- 0x1201 18.0000 0x1200 18.0000 --------- -------- --------- -------- 0x02ff 2.0000 --------- -------- 0x0201 2.0000 0x0200 2.0000 0x01ff 1.0000 --------- --------- 0x0101 1.0000 0x0100 1.0000 0x00ff 0.0000 --------- --------- 0x0001 0.0000 0x0000 0.0000 1.0db 0xffff -1.0000 -------- -------- 0xff01 -1.0000 0xff00 -1.0000 0xfeff -2.0000 -------- -------- 0xfe01 -2.0000 0xfe00 -2.0000 --------- --------- --------- --------- 0xc700 -57.0000 0xc6ff -58.0000 --------- --------- 0xc601 -58.0000 0xc600 -58.0000 0xc5ff -58.0000 --------- --------- 0x8000 -58.0000 table 1 conversion table of volume control
asahi kasei [AK5370] ms0027-e-00 23 2000/05 c) automatic gain control offset field size value description 0 bmrequest type 1 0xa1 1 brequest 1 0x81 get_cur 2 wvalue 2 0x0 700 autom atic_gain_control | channel_0 4 windex 2 0x0300 upper byte : bunit id field in feature unit descriptor.(0x03) lower byte : audio control interface(0x00) 6 wlength 2 0x0001 the length of mute control parameter block the device outputs the current setting of agc. offset field size value description 0 bagc 1 0x01 0x00 true (agc pin is ?h?) false (agc pin is ?l?)
asahi kasei [AK5370] ms0027-e-00 24 2000/05 6.2 endpoint control request the AK5370 supports five sampling frequencies. the sampling rate is changed when ?set endpoint control request ? is issued. set_cur, get_cur of brequest is only supported. get_min, get_ max, and get_res of brequest are not supported. 6.2.1 set endpoint control request offset field size value description 0 bmrequest type 1 0x22 1 brequest 1 0x01 set_cur 2 wvalue 2 0x0100 u pper byte: sampling_freq_control (0x01) lower byte : zero 4 windex 2 0x0081 upper byte : zero lower byte : endpoint address (0x81) 6 wlength 2 0x0003 the length of sampling frequency parameter block the parameter block of mute control is the following. offset field size value description 0 isamplefreq 3 0xyyyyyy the following five values are valid. others are invalid. 0x001f40 : 8khz 0x002b11 : 11.025khz 0x005622 : 22.05khz 0x00ac44 : 44.1khz(default) 0x00bb80 : 48khz if the isamplefreq is different from the above values, the AK5370 forces sampling frequency to the appropriate value. 6.2.2 get endpoint control request offset field size value description 0 bmrequest type 1 0xa2 1 brequest 1 0x81 get_cur 2 wvalue 2 0x0100 u pper byte: sampling_freq_control (0x01) lower byte : zero 4 windex 2 0x0081 upper byte : zero lower byte : endpoint address (0x81) 6 wlength 2 0x0003 the length of sampling frequency parameter block the parameter block of mute control is the following. offset field size value description 0 isamplefreq 3 0xyyyyyy the following five values are valid. others are invalid. 0x001f40 : 8khz 0x002b11 : 11.025khz 0x005622 : 22.05khz 0x00ac44 : 44.1khz 0x00bb80 : 48khz
asahi kasei [AK5370] ms0027-e-00 25 2000/05 package 0.10 0.05 0-10 detail a seating plane note: dimension "*" does not include mold flash. 0.08 0.15+0.10 -0.05 0.22 +0.10 -0.05 0.65 *7.9 0.2 1.25 0.20 a 1 12 13 24 24pin vsop ( unit: mm ) 7.6 0.2 0.5 0.2 5.6 0.12 m
asahi kasei [AK5370] ms0027-e-00 26 2000/05 marking akm AK5370vf aaxxxx 1) pin #1 indication 2) aa: lot# 3) date code: xxxxx(4 digits) 4) marketing code: AK5370vf 5) asahi kasei logo
asahi kasei [AK5370] ms0027-e-00 27 2000/05 important notice these products and their specifications are subject to change without notice. before considering any use or application, consult the asahi kasei microsystems co., ltd. (akm) sales office or authorized distributor concerning their current status. akm assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. akm products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and akm assumes no responsibility relating to any such use, except with the express written consent of the representative director of akm. as used here: (a) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b)a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. it is the responsibility of the buyer or distributor of an akm product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

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