STEVAL-MKI138V3

STEVAL-MKI138V3 STAudioHub USB interface board based on MP45DT02 and STM32 Data brief 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. 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) 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. • LED status indicator • RoHS compliant June 2014 The STM32 microcontroller decodes the PDM signal coming from the microphones and streams the audio via the USB. DocID026565 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com D+ 3 ID 4 GND 5 2 1 R30 100 1 1 L5 BEAD 2 R31 100 1K R24 2 R32 100 2 1 C1 100nF UC_VDD C17 100nF C9 100nF C4 100nF NRST 11 FAIL LED3 C11 100nF 2 2 R6 22 R22 36k 2 1 R33 10K PA2 PA1 PA0-WKUP VDDA VSSA PC3 PC2 PC1 PC0 NRST PD1_OSC_OUT PD0_OSC_IN PC15-OSC32_OUT PC14-OSC32_IN 2 1 E C R8 1.5K Q1 R34 1k UC_VDDUC_VDD 1 1 B R35 1k R12 22 2 1 R23 10k 1 USBDP 180 R26 R27 0R0 NC USBDM 2 1 2 U5 TP1 SPI1_Clock R16 0R NS C41 10nF D5 LED-1 VSS_CAP MIC_DATA12 12.288_CK STM32_LQFP64 1 USB_DISC 43 STM32_I2S_MCLK STM32_I2S_MCLK STM32_I2S_DATA12 C13 100nF R36 0R0 1 VSS_CAP STM32_I2S_LRCK 33 UC_VDD STM32_I2S_BICK 34 35 36 VSS_CAP + 37 2 TP3 TP2 C40 33uF 38 39 40 41 MCO USBDM 44 42 JTMS USBDP C16 4.7uF 45 R14 0R0 C15 100nF UC_VDD 2 C29 2.2uF 46 47 2 JTCK MCO JRST SCL SDA STM32_I2S_LRCK STM32_I2S_BICK 48 C14 4.7uF PB12 PB13 PB14 PB15 PC6 PC7 PC8 PC9 PA8 PA9 PA10 PA11 PA12 PA13 VSS_2 VDD_2 C28 2.2uF 1 STM32_I2S_DATA34 R39 0R0 NC 2 D1 LED-1 R38 1k BEAD 2 L3 INDUCTOR2 1 VCC_USB U4 LD1117 C3 10uF + 3.3V C49 100nF R37 10k 3 1 4 2 XT_ACTIVE U3 MCLK 3.3V R18 0R MIC_VDD MCO I2S_LRCK I2S_BICK I2S_DAT_34 10 12 14 16 9 11 13 15 0R0 R10 1 2 1 1 0R0 R11 1 0R0 R7 0R0 R9 MIC_DATA12 C2 18pF MIC_VDD A_VDD STM32_I2S_DATA34 STM32_I2S_LRCK STM32_I2S_BICK J9 CON4 J10 CON4 STBY RESET 1 MIC1CK FAIL SDA MIC_DATA12 MIC_CK I2S_LRCK 3 4 4 3 DATA CLK MP34DB01 DATA VDD U7 U10 2 1 2 1 2 1 2 MIC_DATA12 MIC_VDD 2 1 2 1 1 R15 10K 2 1 10 8 6 4 J2 MIC_VDD 0R R1 0R NS MIC_VDD 0R NS R42 MIC1LR R13 4 3 DATA VDD U9 1 2 CLK DOUT VDD MIC2CK MP45DT01 GND LR GND U1 CLK DOUT VDD MP45DT01 GND LR GND U2 MP34DB01 CLK L/R 3 2 1 3 2 1 9 7 5 3 5X2_HEADER 2 1 LTR JP3 JP JTMS STM32_I2S_BICK R4 10K STM32_I2S_LRCK R3 10K UC_VDD MIC2LR R41 0R MIC1LR R2 10K MIC_VDD MP34DT01 VDD L/R CLK L/R JRST NRST JTCK MIC_DATA12 MIC_VDD MIC_DATA12 I2S_DAT_34 R19 100 C8 10pF 2 STM32_I2S_DATA12 MIC_VDD C7 10pF MIC_CK 2 2 2 J6 CON4 J8 CON4 STM32_I2S_MCLK 12.288_CK I2S_DAT_12 J15 7 2 C6 NS 6 5 I2S_BICK 8 4 3 R20100 2 1 1 2 UC_VDD Y1 C31 12.288MHz 18pF BEAD L4 2 2 I2S_DAT_12 MUTE SCL C27 100nF L6 BEAD BEAD L1 UC_OSC_OUT UC_OSC_IN 1 1 1 I2S_DAT_56 12.288_CK 2 1 UC_VDD C39 100nF 3 Vin 2 PC13-TAMPER-RTC VBAT C12 4.7uF UC_VDD 16 15 LED1 MIC_CK LED2 14 13 12 10 MUTE 8 7 6 5 4 3 2 1 9 C18 4.7uF STBY RESET UC_OSC_OUT Q2 UC_VDD C5 100nF I/O2 4 USBLC6-2 3 I/O2 I/O1 6 E VBUS 5 U8 B C 2 GND 1 I/O1 2 UC_OSC_IN D4 LED-1 2 1 UC_VDD R5 10K D3 LED-1 2 1 C10 10uF L2 820nH D2 LED-1 2 A_VDD LED1 1 LED2 1 BUT1 TACT2 2 UC_VDD LED3 1 2 Mini TypeB 1 VCC_USB VBUS 1 D- 2 J7 USB_DISC 2 1 63 VSS_3 64 VDD_3 PA3 17 57 R25 47k 20 VSS_4 18 60 PB8 62 PB9 61 BOOT0 PA4 59 PA5 21 VDD_4 19 58 PB7 PA6 22 PB6 2 25 PA7 23 PB5 55 PB4 54 PB3 56 PD2 26 PC5 27 PC4 24 2 1 51 PB0 50 PB1 53 PC12 PB2 49 PA14 52 PC11 PB10 28 PC10 29 PA15 PB11 30 VSS_1 31 VDD_1 32 2 R40 1 2 R17 2 1 2 R21 0R N1S 1 2 2 1 3 3 1 4 Vout 2 Vout 1 GND 0R 4 4 0R 1 NS 1 1 2 1 UC_VDD 1 1 VCC_USB 2 2 UC_VDD 3 3 GND 5 GND 5 4 4 GND DocID026565 Rev 1 5 2/4 4 3 DATA CLK C20 15pF 4 5 6 C26 15pF 4 5 6 U11 UC_VDD R28 100 1 2 MP34DT01 VDD L/R R29 C19 100 15pF 2 C22 10uF MIC_VDD C25 15pF 2 C24 10uF MIC_VDD REVISION RECORD ECO NO: GND MIC2CK MIC_VDD MIC2LR MIC_CK DATE: MIC1CK MIC_DATA12 C21 100nF MIC_CK MIC_DATA12 1 1 C23 100nF APPROVED: 1 5 Schematic diagram STEVAL-MKI138V3 Schematic diagram Figure 1. STEVAL-MKI138V3 circuit schematic STEVAL-MKI138V3 2 Revision history Revision history Table 1. Document revision history Date Revision 17-Jun-2014 1 Changes Initial release. DocID026565 Rev 1 3/4 4 STEVAL-MKI138V3 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 herein 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 assumes 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. 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