User manual

Audio Development Board User’s Guide

2.3 AUDIO CODEC, MICROPHONE AND AUDIO CONNECTIONS

The audio codec (U1) is a Wolfson WM8960. The codec is of hi-fi quality with up to

24-bit resolution. The sampling rates supported are between 8 kHz to 48 kHz and

includes an on-chip flexible PLL. The codec has a built-in headphone driver and a ste-

reo Class D speaker driver. In addition, it has low-power consumption and offers a

small foot print. On 32-bit microcontroller, the codec data interface is handled through

the SPI module in Framed SPI mode. On 16-bit microcontroller, the codec data inter-

face is handled through the DCI module. The control registers of the codec are config-

ured over the I

C interface. The codec external clock is provided by a 12 MHz crystal

oscillator.

The condenser microphone (MIC1) is available on the board for capturing audio. The

microphone bias voltage is provided directly by the codec and is connected via Line

Input 1 of the codec. The microphone bias voltage level and sensitivity are controlled

via the codec registers. The microphone signal is presented as a mono signal to the

application.

The line-in jack (Line IN) is available to interface to audio signal sources (such as CD

players and musical instruments) that use line level ouputs.The line input signal is a

stereo signal and is connected to Left Input 2 and Right Input 2 of the codec.

The Headphone jack (HP OUT) is a 3.5 mm stereo socket that connects to the codec

headphone amplifier, with the headphone signal output as a true stereo signal. Any

commercially available headphone can be connected to the headphone jack. The

headphone volume and the headphone input signal are configurable via the codec

registers. The codec outputs a maximum of 20 mW into a 32 Ohm headphone.

2.4 PICtail™ PLUS CONNECTOR

The expansion connector (J2) on the Audio Development Board can be used to enable

Made for iPod (MFi) features for an iPod

PICtail Plus board. The PICtail Plus

connector is not compatible with any other PICtail Plus Daughter boards.

2.5 TFT DISPLAY

The Audio Development Board has a 2 inch TFT display (LCD1) with a resolution of

220x176 for a maximum of 262K colors. The display is controlled by a chip-on-glass

OTM2201A display controller. The display controller requires 8-bit parallel interface.

The Parallel Master Port (PMP) on the MCU is used to interface to the display

controller.

2.6 USB CONNECTIVITY

The Audio Development Board features USB Host support (J7). This connector allows

applications to interface to USB devices such as a USB Thumb Drive, USB mouse, and

so on. The USB module on the MCU provides the required USB Host functionality. A

5V switch controlled by the MCU controls the power supply to the attached USB device.

Note: The maximum line input signal level should not exceed 0.5Vrms on

differential and 1Vrms on single-ended input.