for further information contact your local stmicroelectronics sales office. november 2013 docid025251 rev 1 1/8 STEVAL-MKI126V2 mems microphone system evaluation board based on the sta321mpl and mp34db01 data brief features ? 2 mp34db01 mems microphones ? 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 ? fully configurable with: ? steval-mki29v1/v2/v3 ? steval-mki131v1/v2/v3 ?steval-mki116v1 ? steval-mki117v1/v2 ? steval-cca035v1 ? controllable via apworkbench software suite ? rohs compliant description the STEVAL-MKI126V2 system evaluation board can connect up to six microphones using the sockets provided or through a dedicated six- microphone array. the digital interface of the device allows interfacing the mic output to the most widely used audio receivers and digital amplifiers or simple evaluation of the mic using generic audio measurement equipment. the filtered pwm signals allow the connection of a headset to listen to the audio received through the microphones. the fully digital path ensures a high level of processing with sound preconditioning, filtering and voice enhancement. the main purpose of the STEVAL-MKI126V2 is to convert the pdm signals provided by the microphones into the more common i 2 s and pwm signals. the i 2 s signal is routed both on general and interface connectors, while the suitably-filtered pwm signals provide an analog interface. mounted on the STEVAL-MKI126V2 are two mp34db01 microphones and an sta321mpl processor. www.st.com
schematic diagrams STEVAL-MKI126V2 2/8 docid025251 rev 1 1 schematic diagrams figure 1. circuit schematic (1 of 5) + ( $ ' 3 + 2 1 ( 2 3 & q ) & x ) & q ) & x ) & . ' 4 4 4 4 ' & . & / 5 ' & . 3 5 4 4 * 1 ' 4 4 3 5 & . ' & / 5 9 ' ' 8 9 + & 5 . & q ) & s ) < ; 7 b $ & 7 , 9 ( & 6 ; ) % & 0 7 5 5 5 . 9 / , 2 b 9 / , 2 b 9 & & , 2 b 9 / , 2 b 9 & & , 2 b 9 / , 2 b 9 & & , 2 b 9 / , 2 b 9 & & * 1 ' 9 & & , 2 b 9 & & , 2 b 9 / , 2 b 9 & & , 2 b 9 / , 2 b 9 & & , 2 b 9 / , 2 b 9 & & , 2 b 9 / 2 ( 8 6 7 ( & q ) & q ) & q ) & q ) & q ) & q ) & q ) & q ) & q ) 6 - - 3 - 3 5 5 & s ) 5 5 & s ) & s ) - ; b + ( $ ' ( 5 0 9 2 * 1 ' 9 ' ' * 1 ' 9 ' ' 6 ' , 6 ' , 6 ' , 6 ' , / 5 & . , % , & . , 9 ' ' * 1 ' 9 ' ' 5 ( 6 ( 7 3 / / % 6 $ 6 ' $ 6 & / ; 7 , 3 / / ) 9 ' ' b 3 / * 1 ' b 3 / 9 ' ' & . 2 8 7 9 ' ' * 1 ' 9 ' ' 2 8 7 % 2 8 7 $ 2 8 7 % 2 8 7 $ 2 8 7 % 2 8 7 $ 9 ' ' * 1 ' 9 ' ' 2 8 7 % 2 8 7 $ 2 8 7 % 2 8 7 $ 2 8 7 % 2 8 7 $ 9 ' ' * 1 ' 9 ' ' 2 8 7 % 2 8 7 $ 2 8 7 % 2 8 7 $ ( $ 3 ' 9 ' ' * 1 ' 9 ' ' % , & . 2 / 5 & . 2 6 ' 2 6 ' 2 9 ' ' * 1 ' 9 ' ' 6 ' 2 6 ' 2 3 : ' 1 8 & q ) 5 . & q ) + + + + & q ) 9 , 1 * 1 ' 9 , 1 + % < 3 $ 6 6 2 8 7 8 / ' 6 ; ; & x ) 9 , 1 9 2 8 7 * 1 ' 8 , & / ' 9 - & 1 3 & x ) y & q ) & q ) 8 & x ) y 5 . & s ) 2 8 7 , 1 , 1 * 1 ' 9 & & 2 8 7 , 1 , 1 8 7 6 5 . 5 . & s ) 5 . 5 . 5 . 5 . & s ) 5 . 5 . & s ) 5 . 5 . 5 . & s ) & s ) 5 n 5 n 5 n 5 n 5 n & s ) 5 n & s ) & x ) & x ) - & x ) 5 5 1 ) 5 5 5 5 1 ) 5 5 1 ) 5 5 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 5 5 1 ) 9 9 b , 1 7 9 b , 1 7 & . 2 8 7 b + & . 2 8 7 b + & . 2 8 7 b + 5 ( 6 ( 7 6 & / 6 ' $ 9 b , 1 7 ( 1 2 6 & b & . ; 7 , 9 b , 1 7 9 b , 1 7 9 b , 1 7 & . 2 8 7 b + 9 b , 1 7 9 b , 1 7 % , & . 2 / 5 & . 2 6 ' 2 b 6 ' 2 b 6 ' 2 b 9 b , 1 7 9 b , 1 7 9 9 b , 1 7 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 3 ' 0 , 1 b b 3 ' 0 , 1 b b 3 ' 0 , 1 b b 3 ' 0 , 1 b b 3 ' 0 , 1 b b 3 ' 0 , 1 b b & . 2 8 7 b + & . 2 8 7 b + & . 2 8 7 b / & . 2 8 7 b / 3 ' 0 , 1 b 3 ' 0 , 1 b 3 ' 0 , 1 b 3 ' 0 , 1 b 3 ' 0 , 1 b 3 ' 0 , 1 b 9 9 b , 1 7 0 , & b 9 & & 9 6 ' 2 b 6 ' 2 b 6 ' 2 b % , & . 2 / 5 & . 2 6 & / 9 ; 7 , 2 6 & b & . 0 & / . 5 ( 6 ( 7 3 : ' 1 6 ' $ 0 & / . 0 8 7 ( ) $ , / / 5 & . 2 % , & . 2 6 ' 2 b 6 ' 2 b 6 ' 2 b 9 b , 1 7 9 b , 1 7 ( 1 9 b , 1 7 9 b ( ; 7 9 b , 1 7 9 9 b ( ; 7 , ) b & / . ( $ 3 ' 9 b , 1 7 9 b , 1 7 + 3 2 8 7 + 3 2 8 7 + 3 2 8 7 + 3 2 8 7 9 b , 1 7 3 : ' 1 & . 2 8 7 b + , ) b & / . $ 0 y
docid025251 rev 1 3/8 STEVAL-MKI126V2 schematic diagrams 8 figure 2. circuit schematic (2 of 5) * 1 ' / 5 * 1 ' 9 ' ' ' 2 8 7 & / . 8 0 3 ' 7 & x ) & q ) * 1 ' / 5 * 1 ' 9 ' ' ' 2 8 7 & / . 8 0 3 ' 7 & x ) & q ) & s ) & s ) 5 5 & s ) 5 5 & s ) 5 5 1 ) 5 5 5 5 5 5 1 ) & / . * 1 ' 9 ' ' ' $ 7 $ / 5 8 0 3 ' % & / . * 1 ' 9 ' ' ' $ 7 $ / 5 8 0 3 ' % & / . ' $ 7 $ / 5 9 ' ' * 1 ' 8 0 3 ' 7 & / . ' $ 7 $ / 5 9 ' ' * 1 ' 8 0 3 ' 7 0 , & b & . 0 , & b ' $ 7 $ b % 2 $ 5 ' 0 , & b 9 & & 0 , & b & . 0 , & b ' $ 7 $ b % 2 $ 5 ' 0 , & b 9 & & $ 0 y
schematic diagrams STEVAL-MKI126V2 4/8 docid025251 rev 1 figure 3. circuit schematic (3 of 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 & . $ 0 y
docid025251 rev 1 5/8 STEVAL-MKI126V2 schematic diagrams 8 figure 4. circuit schematic (4 of 5) 0 l f $ u u d \ r q e r d u g 0 l f v z l w f k 0 , & , q s x w 6 h o h f w l r q , q g l f d w r u / ( ' 2 q 2 q e r d u g 0 l f / ( ' 2 i i 0 l f $ u u d \ 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 $ 0 y
schematic diagrams STEVAL-MKI126V2 6/8 docid025251 rev 1 figure 5. circuit schematic (5 of 5) 0 l f g d w d o h y h o v h o h f w l r q ' h i d x o w v h w w l q j 9 0 , & $ 5 5 $ < , 1 7 ( 5 ) $ & ( 0 , & & / 2 & . 6 ( / ( & 7 , 2 1 - 5 5 1 ) 5 5 1 ) 5 5 1 ) 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 5 5 1 ) 5 5 0 , & b & . & . 2 8 7 b / & . 2 8 7 b + 0 , & b & . & . 2 8 7 b / & . 2 8 7 b + 3 ' 0 , 1 b 0 , & b ' $ 7 $ 3 ' 0 , 1 b b 3 ' 0 , 1 b 0 , & b ' $ 7 $ 3 ' 0 , 1 b b 3 ' 0 , 1 b 0 , & b ' $ 7 $ 3 ' 0 , 1 b b 3 ' 0 , 1 b 0 , & b ' $ 7 $ 3 ' 0 , 1 b b 3 ' 0 , 1 b 0 , & b ' $ 7 $ 3 ' 0 , 1 b b 3 ' 0 , 1 b 0 , & b ' $ 7 $ 3 ' 0 , 1 b b 0 , & b 9 & & 0 , & b & . 0 , & b ' $ 7 $ b $ 5 5 $ < 0 , & b ' $ 7 $ b $ 5 5 $ < 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ 0 , & b ' $ 7 $ $ 5 5 $ < b ' ( 7 $ 0 y
docid025251 rev 1 7/8 STEVAL-MKI126V2 revision history 8 2 revision history table 1. document revision history date revision changes 11-nov-2013 1 initial release.
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