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4.4

Digital Audio Interface(I2S)

The digital audio interface supports the industry standard formats for I2S,left-justified or

right-justified. The interface shares the same pins as the PCM interface ,which means each

audio bus is mutually exclusive in its usage. Table as below lists these alternative

functions

4.5

RF Interface

The module integrates a balun filter. The user can connect a 50ohms antenna directly to the

RF port.

4.6

General Purpose Analog IO

The general purpose analog IOs can be configured as ADC inputs by software. Do not

connect them if not use.

4.7

General Purpose Digital IO

There are nine general purpose digital IOs defined in the module. All these GPIOs can be

configured by software to realize various functions, such as button controls, LED displays

or interrupt signals to host controller, etc. Do not connect them if not use.

4.8

Serial Interfaces

4.8.1

UART

This is a standard UART interface for communicating with other serial devices. The UART

interface provides a simple mechanism for communicating with other serial devices using

the RS232 protocol.

When the module is connected to another digital device, UART_RX and UART_TX

transfer data between the two devices. The remaining two signals, UART_CTS and

UART_RTS, can be used to implement RS232 hardware flow control where both are

active low indicators.

Note: The serial port interface(UART)can be used for system debugging. Don’t

support to use command set for profile function application by UART, such as

HFP/A2DP/AVRCP and so on. These profiles function application can be controlled

only by PIO, such as pairing/connect/answer/play/pause/next/previous function

application and so on.