Silicon Laboratories SiM3U1xx Bedienungsanleitung PDF herunterladen (Seite 13)

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5.6. USB Input/Output Mode

In USB input/output mode, the system samples and outputs data at 48 kHz. The USB data is 16-bit signed data.

Figure 12. USB Input/Output Mode Block Diagram

For playing (from PC to the board), the board receives data from the USB interface using the si32Library USB

Audio Component and outputs the PWM waveform on the EPCA0 module.

For recording (from board to the PC), the firmware measures the microphone (MK1) using one SARADC module

and sends the data to the PC using the si32Library USB Audio Component.

Figure 13 shows the data flow for the USB input/output mode.

Figure 13. USB Input/Output Mode Flow Diagram

Class-D RD Board

SiM3U1xx

SARADC0

EPCA

USB

MIC

Host PC

sound

software

SiM3U1xx

hardware

gain stage

SARADC0

remainder-

weighted

dither

shift from 12

bits unsigned

to 16 signed

EPCA

9-bit

quantization

USB0

Host PC

sound

software

MIC

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Silicon Laboratories SiM3U1xx Bedienungsanleitung Seite 13