Embedded LPC3250 Uživatelská příručka stáhnout pdf (Strana 40)

LPC3250 Developer’s Kit v2 - User’s Guide

Page 40

GPIO70

GPIO_00

GPIO42

GPO_14

4.25 SP15: I2S Audio Codec

The board contains an I2S audio codec based on UDA1380 from NXP. The codec is controlled via I2C

and audio data is transferred over the I2S bus.

The OEM Base Board supports different OEM Boards and the I2S signals can be located at two

different groups of signals from the OEM Board. Jumper JP22-JP27 selects which group of signals to

connect to the I2S interface of the UDA1380. For LPC3250 OEM Board, set all jumpers in lower

position (see picture below). Note that this is not the default setting of the jumpers when the

board is delivered.

The audio codec provides a mono microphone input, a stereo line input, a stereo line output and a

stereo headphone output. The board also has an on-board speaker. The right line output can be used

to drive the speaker. Signal GPIO40 (GPO_00 from the LPC3250) is also connected to the speaker via

JP29 (pos 1-2). By PWM-modulating this signal and audio signal can also be created.

See picture below for locating relevant components. The table below lists signal connections.

Figure 24 – I2S Audio Codec Interface

Signals

LPC3250

I2C-SDA

I2C1-SDA

I2C-SCL

I2C1-SCL

GPIO40

GPO_00

GPIO56

I2S1TX_CLK

GPIO57

I2S1TX_SDA

GPIO58

I2S1TX_WS

Speaker

SP1

Audio Connectors

Left-to-right:

J27, J28, J29, J30

Mic in, Line in, Line out, Headphone out

Audio Select

JP29

I2S Select

Left-to-right: JP22, JP23,

JP24, JP25, JP26, JP27, JP28

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 65 66

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