for further information contact your local stmicroelectronics sales office. june 2014 docid026565 rev 1 1/4 STEVAL-MKI138V3 staudiohub usb interface board based on mp45dt02 and stm32 data brief features ? sound card automatically recognized by a pc as an audio device. ? mems microphones provide a high frequency data stream (1 to 3.25 mhz) of 1-bit digital samples (pdm technique) ? audio signals collected from the microphones are sent to the pc by usb (powered and connected to pc through usb) ? led status indicator ? rohs compliant description the purpose of the STEVAL-MKI138V3 staudiohub evaluation board is to demonstrate the decoding and streaming performance of digital mems microphone outputs. the STEVAL-MKI138V3 hosts the mp45dt02 top-port digital microphone, which works as a sensor, and the stm32f107rc microcontroller, working as an audio decoder. these microphones are analog-to-digital transducers. they are able to sense sound pressure and convert this signal into a digital signal using the pdm technique. the stm32 microcontroller decodes the pdm signal coming from the microphones and streams the audio via the usb. the STEVAL-MKI138V3 evaluation board is a sound card which is automatically recognized by a pc as an audio device. connection is made through a usb cable, which also supplies the board, and then streams the audio collected from the microphones to the pc. it is also possible to use the board as an interface for other microphone pcbs (steval-mki126vx). in this case is recommended the use of the apworkbench software tool. www.st.com
schematic diagram STEVAL-MKI138V3 2/4 docid026565 rev 1 1 schematic diagram figure 1. STEVAL-MKI138V3 circuit schematic revision record date: ltr eco no: approved: 1 vbat 2 pc13-tamper-rtc 3 pc14-osc32_in 4 pc15-osc32_out 5 pd0_osc_in 6 pd1_osc_out 7 nrst 8 pc0 9 pc1 17 pa3 18 vss_4 10 pc2 11 pc3 12 vssa 13 vdda 14 pa0-wkup 15 pa1 16 pa2 19 vdd_4 20 pa4 21 pa5 22 pa6 23 pa7 24 pc4 25 pc5 26 pb0 27 pb1 28 pb2 29 pb10 30 pb11 31 vss_1 32 vdd_1 pb12 33 pb13 34 pb14 35 pb15 36 pc6 37 pc7 38 pc8 39 pc9 40 pa8 41 pa9 42 pa10 43 pa11 44 pa12 45 pa13 46 vss_2 47 p vdd_2 48 a14 49 pa15 50 pc10 51 pc11 52 pc12 53 pd2 54 pb3 55 pb4 56 pb5 57 pb6 58 pb7 59 boot0 60 pb8 61 pb9 62 vss_3 63 vdd_3 64 u5 stm32_lqfp64 1 2 0r0 r7 1 2 0r0 r9 1 2 0r0 r10 1 2 0r0 r11 1 2 r2 10k 1 2 r3 10k 1 2 r4 10k c49 100nf 12 l3 inductor2 bead 12 d5 led-1 c41 10nf r38 1k c39 100nf c40 + 33uf 12 l1 bead c1 100nf 1 2 r5 10k c4 100nf 12 but1 tact2 c5 100nf 1 2 r6 22 1 2 r12 22 1 2 r15 10k 12 34 56 78 910 11 12 13 14 15 16 j15 1 2 r19 100 1 2 r20 100 c6 ns c7 10pf c8 10pf 12 l2 820nh c9 100nf c10 10uf c11 100nf c12 4.7uf c13 100nf c14 4.7uf c15 100nf c16 4.7uf c17 100nf c18 4.7uf 1 2 r8 1.5k e b c q1 e b c q2 1 2 r22 36k 1 2 r23 10k 1 2 r24 1k 1 2 r25 47k 1 2 r26 180 12 d1 led-1 1 2 r27 0r0 nc 1 gnd 2 lr 3 gnd 6 vdd 5 dout 4 clk u1 mp45dt01 c21 100nf c22 10uf 1 2 r29 c19 100 15pf c20 15pf 1 gnd 2 lr 3 gnd 6 vdd 5 dout 4 clk u2 mp45dt01 c23 100nf c24 10uf 1 2 r28 100 c25 15pf c26 15pf 1 2 r30 100 12 d2 led-1 1 2 r31 100 12 d3 led-1 1 2 r32 100 1 2 d4 led-1 12 l4 bead r34 1k r35 1k 12 34 u3 xt_active 1 2 r37 10k c27 100nf 1 2 r33 10k 1 2 r36 0r0 1 2 r39 0r0 nc c28 2.2uf c29 2.2uf 1 2 3 4 5 6 7 8 9 10 j2 5x2_header 1 2 jp3 jp 12 l5 bead 1 2 3 4 j6 con4 1 2 3 4 j8 con4 1 2 3 4 j9 con4 1 2 3 4 j10 con4 1 i/o1 2 gnd 3 i/o2 i/o2 4 vbus 5 i/o1 6 u8 usblc6-2 tp1 spi1_clock vbus 1 d- 2 d+ 3 id 4 gnd 5 j7 mini typeb c2 18pf c31 18pf tp2 tp3 1 2 r14 0r0 1 clk 5 gnd 3 vdd 2 l/r u7 mp34db01 1 clk 5 gnd 3 vdd 4 data 2 l/r u9 mp34db01 3 clk 4 data l/r 2 vdd 1 5 gnd u10 mic_vdd mp34dt01 3 clk 4 data l/r 2 vdd 1 5 gnd u11 mp34dt01 r16 0r ns vout gnd vout vin 1 2 3 4 u4 ld1117 + c3 10uf 12 l6 bead 1 2 y1 12.288mhz r17 2 0r 1 2 r18 0r r13 0r r42 0r ns r1 0r ns r41 0r n 1 r21 2 0r s 1 n 1 r40 2 0r s i2s_bick i2s_lrck i2s_dat_12 i2s_dat_34 stm32_i2s_data34 stm32_i2s_data12 stm32_i2s_bick stm32_i2s_lrck vcc_usb vcc_usb a_vdd uc_vdd uc_osc_in uc_vdd uc_vdd scl sda usbdm usbdp uc_osc_out nrst i2s_dat_12 i2s_dat_34 i2s_dat_56 i2s_bick i2s_lrck scl 3.3v reset stby sda mclk mute fail reset a_vdd uc_vdd uc_vdd vcc_usb uc_vdd uc_vdd usb_disc uc_vdd mic_data12 uc_vdd mic_vdd mic_data12 mic_ck mic_vdd mic_data12 mic_ck led1 mic_ck led2 uc_vdd led1 led2 led3 mic_vdd uc_vdduc_vdd uc_vdd stby mute fail uc_vdd 12.288_ck mic_vdd 12.288_ck led3 vss_cap vss_cap vss_cap 12.288_ck stm32_i2s_mclk jtms stm32_i2s_bick stm32_i2s_lrck nrst jtck 3.3v mic_vdd mic_data12 mic_ck mic_vdd mic_data12 mic_ck stm32_i2s_lrck stm32_i2s_bick stm32_i2s_data12 stm32_i2s_mclk mco usb_disc usbdm usbdp jtms mco jtck jrst stm32_i2s_lrck stm32_i2s_bick stm32_i2s_data34 uc_osc_in uc_osc_out jrst mic1ck mic1lr mic2ck mic_vdd mic1lr mic1ck mic_data12 4 data mic_data12 mic_vdd mic_vdd mic_data12 mic2lr mic2ck uc_vdd stm32_i2s_mclk mco mic_vdd mic2lr
docid026565 rev 1 3/4 STEVAL-MKI138V3 revision history 4 2 revision history table 1. document revision history date revision changes 17-jun-2014 1 initial release.
STEVAL-MKI138V3 4/4 docid026565 rev 1 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statem ents and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2014 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - swed en - switzerland - united kingdom - united states of america www.st.com
|
