for further information contact your local stmicroelectronics sales office. september 2012 doc id 023685 rev 1 1/9 9 STEVAL-MKI126V3 stsmartvoice demonstration board data brief features 2 on-board mems mp34dt01 microphones on board capable of driving up to 6 digital mems microphones 3 independent i 2 s outputs up to 10 independent 32-bit user programmable biquads per channel the demonstration board is fully configurable with: ? steval-mki129v1/v2/v3 ? steval-mki131v1/v2/v3 ? steval-mki116v1 ? steval-mki117v1/v2 ? steval-cca035v1 controllable via apworkbench software suite rohs compliant description the STEVAL-MKI126V3 demonstration board allows the connection of up to six microphones using the sockets provided, or through the connection of a dedicated six-microphone array. the digital interface of the board allows the interfacing of the mic output to the most widely used audio receivers and digital amplifiers, or permits evaluation of the mic with generic audio measurement equipment. the filtered pwm signals allow the connection of a headset to listen to audio received through the microphones. the fully digital path ensures a high level of processing with sound preconditioning, filtering and voice enhancement. the main function of the STEVAL-MKI126V3 is to convert the pdm signals from the microphones into more common i 2 s and pwm signals. the i 2 s signal is routed both on a general and interface connector. appropriately filtered pwm signals provide an analog interface. the STEVAL-MKI126V3 is equipped with two mp34dt01 microphones and an sta321mpl scalable digital microphone processor. www.st.com
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STEVAL-MKI126V3 schematic diagrams doc id 023685 rev 1 5/9 figure 4. schematic diagram 3/5 - 3 - 3 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 - & 2 1 5 5 & s ) & s ) 5 5 5 5 5 5 & s ) & s ) & s ) & s ) & s ) & s ) 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 1 ) 5 5 0 , & b 9 & & 0 , & b ' $ 7 $ 0 , & b & . 0 , & b 9 & & 0 , & b ' $ 7 $ 0 , & b & . 0 , & b 9 & & 0 , & b ' $ 7 $ 0 , & b & . 0 , & b 9 & & 0 , & b ' $ 7 $ 0 , & b & . ! - v
schematic diagrams STEVAL-MKI126V3 6/9 doc id 023685 rev 1 figure 5. schematic diagram 4/5 - i c ! r r a y o n b o a r d - i c s w i t c h - ) # ) n p u t 3 e l e c t i o n ) n d i c a t o r , % $ / n / n b o a r d - i c , % $ / f f - i c ! r r a y 5 5 ' / ( ' , 1 9 & & * 1 ' 6 ' 6 , & , & 6 7 * , 1 9 & & * 1 ' 6 ' 6 , & , & 6 7 * & q ) & q ) 5 5 - - - - 5 5 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ b % 2 $ 5 ' 0 , & b ' $ 7 $ b $ 5 5 $ < 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ b % 2 $ 5 ' 0 , & b ' $ 7 $ b $ 5 5 $ < 0 , & b ' $ 7 $ 9 b , 1 7 $ 5 5 $ < b ' ( 7 9 b , 1 7 $ 5 5 $ < b ' ( 7 ! - v
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revision history STEVAL-MKI126V3 8/9 doc id 023685 rev 1 3 revision history table 1. document revision history date revision changes 18-sep-2012 1 initial release.
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