AN4041 STMICROELECTRONICS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 14

Technical content

Datasheet sections

  • 1 Software description
  • 2 Hardware description
  • 3 Getting started
  • 4 Revision history

capability of the board to host these microphones. microphones and streams the audio via the USB. information for these boards can be found in Appendix C on page 12. Figure 1. APWLink+ demonstration board

1 Software description

The digital signal processing (DSP) consists of the simple flow depicted in the figure below. Figure 2. DSP pipeline that has been designed as two filtering-decimation stages. code modulated (PCM) signal. decoding on STM32 microcontrollers” available on www.st.com.

2 Hardware description

the audio collected from the microphones to the PC. Figure 3. Microphone USB demonstration board (block diagram) high. For instance, the MP34DT01 cannot support a supply voltage of 3.3 V. Table 1. Microphone supply voltage range

12.288 MHz

unsolder these resistors and manually set the LR pin using the solder jumper J1 and J5. been implemented in order to let the user put the microphones in the desired position (i.e. for display applications in which the microphones are placed at the edges of the display). these signals can be monitored on the APWLink connector.

  • D1 on: USB enumeration successful
  • D2 on: Firmware correctly downloaded
  • D3 off: Firmware correctly downloaded
  • D4: not soldered
  • D5 on: Board supplied

Table 2. L/R channel selection

3 Getting started

micro USB cable to the laptop or desktop, the message shown in Figure 4 below appears. the sampling frequency and 64 as the decimator index. Figure 4. Windows message demonstration board appears as a USB audio device in the list below. Figure 5. Computer management

general-purpose acoustic tools. Figure 6. Recording properties

Figure 7. Schematic

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

10 PC2

11 PC3

12 VSSA

13 VDDA

14 PA0-WKUP

15 PA1

16 PA2

50 PA15

51 PC10

52 PC11

53 PC12

54 PD2

55 PB3

56 PB4

57 PB5

58 PB6

59 PB7

60 BOOT0

61 PB8

62 PB9

63 VSS_3

64 VDD_3

12 R70R0

12 R90R0

12 R100R0

12 R110R0

2 OUT1

3 OUT2

4 ADJ

12 R6 22

12 R1222

12 R210R0

1 GND

3 GND

1 I/O1

2 GND

3 I/O2 4I/O2

1 VIN

3 VINH

3 VDD

4 DATA

3 CLK

www.st.com referenced by the ordering codes listed below. Table 3. Ordering information for demonstration boards

4 Revision history

Table 4. Document revision history