User's Manual

7
OPENBRAIN Technologies Co., LTD.
2. How to Use
2.1. Hardware Design Methodology
To use M5G module with existing communication devices, connect Host Processor with RESETB
and UART transceiver port as shown and connect SP+, SP-, MIC+ and MIC- to analog audio input/output
port of Audio Codec via Differential Mode. To connect audio input/output as Single Ended Mode, use any
one of the two terminals or use dedicated audio Amp to change the mode. But Differential Mode is
strongly recommended as it has the effect of improving S/N ratio. In case Single Ended Mode has to be
used, it is recommended that dedicated Amp be used.
2.2. Operating Procedures
The operating procedures for M5G module are as follows: Details on operating procedures and
UART communication protocol are defined in a separate document.
 Pairing Mode: Searches for Bluetooth devices in the vicinity that support Handsfree and
Headset profiles and allows user to connect with a specific selected device.
 Paging Mode: Connection attempt with paired device. If pairing information of multiple devices
are present, paging will start with the latest device that has been connected.
 Connected Mode: Bluetooth link established with paged device.
 Incoming Call: The state wherein bell rings when call is coming in.
 Outgoing Call: The state wherein user makes a call.
 Talk Mode: The state where user is talking with other party.
M5G Bluetooth
Audio Module
+3.3V
VDD
GND
RESETB
1
13,14
2
3,4
Host Processo
r
SP
11,12
MIC
A
udio Codec &
Amplifier
UART
5,6