STEVAL-MKI126V2 MEMS microphone system evaluation board based on the STA321MPL and MP34DB01 Data brief 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 Features and voice enhancement. 2 MP34DB01 MEMS microphones The main purpose of the STEVAL-MKI126V2 is to Capable of driving up to 6 digital MEMS convert the PDM signals provided by the 2 microphones microphones into the more common I S and 2 2 PWM signals. The I S signal is routed both on 3 independent I S outputs general and interface connectors, while the Up to 10 independent 32-bit user suitably-filtered PWM signals provide an analog programmable biquads per channel interface. Fully configurable with: Mounted on the STEVAL-MKI126V2 are two STEVAL-MKI29V1/V2/V3 MP34DB01 microphones and an STA321MPL STEVAL-MKI131V1/V2/V3 processor. STEVAL-MKI116V1 STEVAL-MKI117V1/V2 STEVAL-CCA035V1 Controllable via APWorkbench software suite RoHS compliant November 2013 DocID025251 Rev 1 1/8 For further information contact your local STMicroelectronics sales office. www.st.com Q) & & + + + + & & . 5 7 6& 6 - & 5 1 ) & & & 3/ 5 & 5( 5( 5 5 9 9 +( N 5 & *1 *1 , 5 5 5 . 9 9 & & & %, 5 5 5 . ,1 *1 /5 5 5 0& ,1 ,1 6 . 5 5 5 5 5 ,1 6 & & (1 7 9& . 6 5 5 5 5 1 ) 5 1 ) 26 6 8 5 5 N 9 9 6 5 & *1 *1 6 & 9 9 & 6 *1 09 %, 5 5 , /5 ( - 5 (1 %, 26 & /5 5 & Q) 6 7 & 5 5 1 ) 6 5 5 6 3: 0, 5 1 ) 5 9 9 5 5 5 6 9 & 2( *1 , , 4 *1 X) & & & & , , - & & 4 4 & 0, , , &. 3 4 0& 9, 0, , , 5 5 3: & 3 0, , , 5( & 9, 0, , , & & ) 08 5 -3 0, 8 5 &. , , -3 6& 9 &/ 0, 6 , , 9 %, 9& 9/ /5 8 6 6 8 6 9 & & & & & *1 92 9, &1 17 9 - 8 Schematic diagrams STEVAL-MKI126V2 1 Schematic diagrams Figure 1. Circuit schematic (1 of 5) .&B& /, 9 B ,17 B2 .2& 7(6 1 3(2 213+ ) S B &79,( . X) X ) &6 %) & 075 B9 ,17 S ) , &B&/ 2873+ +3 287 & .2 2 2 B B S ) (7 / Y X) /. B 19, 7 S) )Q & 3287+ 287 287+3 9 B,17 67 &.287 B + N 287 N S ) B9 17, . 5 N 5/ )S 4 N 9 4 & + S S S) ) ) 5 . 5 )S S) 9 9 ,71 B B7,1 3 &. 287.& +B287 B+ Q) ) Q B,917 ) Q % 287 287 287 287 287 287 287 287 287 287 % & 287 % % % % 8 .287B+ 287 287 % 287 2B 2B 2B 2.& 2.& 3 287 % 287 Q) B 9, Q) 71 1B B ,03 &B 1B B , 30 B& ,0 1B B 3 &B .287B& &.287 7 7 7 + B / 2 . & 8 2 . & 7 28 . & Q) 2 B 9 , 2 /3 ,79 1 B / 3 B & 2 2 2 2 ) / B9/ B/ 9 9B/ /9B 2B 2B B2 2B ( &9& & &9 && 9 9& & , 2 / 67 2 9 B2/ &&9B2 B /29 2B9&& /B92 &&9B2 29/B 2&B9 & )S B 1,9 3: 1 7 / 2 , , , , .&, &,. (76 % )Q , / . )Q 71, B9 &B/287. &B &B &B & 7 7 7 . B287 7(6 + 3 0,1B B 1B B 3 0, 1B B ,0 3 /&B). 1B ,30 0,1B 3 0,1B 3 3 01B , 0,1B 3 3 01B , 17 B9, 1 B9 B9 1,7 ,71 Q) Q) X) & 7 1, B9 &&9B Q) (9 B 7 )Q %<3 6 6 728 78 *1 & , 1 6/ 9 / 1 +1 Q) )Q B+( 5( 9 B 9 17, B( 7 X) Y , B9 71 ) .B&/ )X & 3 .287 B+ .2& 2&. B2 B 2 B2 0 Y 2/8 DocID025251 Rev 1 44 < 5 5 5 5 1 ) 6 6 6 6& 6 7 9 3/ *1 9 9 *1 B 6 9 6 /5 9 %, *1 9 9 *1 9 ( X) & &