Gigawit Electronics GWBMA1X User Manual

Gigawit Bluetooth Audio module

GWBMA1x Datasheet

(preliminary)

rev. 0.9 06232016

GWBMA1x

A

Analog

1. Introduction

GWBMA1x BT Audio module is a low power consumption Bluetooth module for audio application. It is

compatible with Bluetooth 4.2+EDR standard, providing high quality wireless audio solution to customer.

2. Feature

●

Support Standby/Shutoff/Sleep modes

●

Support serial ADC Keypad input

●

I2S interface available for Audio codec

●

UART，USB1.1，GPIO and OTG for expansion

●

Support up to 48kHz/16bit DAC sampling for Bluetooth stereo audio

●

Bluetooth audio transmission; Bluetooth headset feature

●

Firmware pre-programmed, no software or RF engineering resource needed

●

Internal codec supports WAV, MP3, WMA, JPEG Audio, ACC*

3. Application

This module can be applied for short distance audio transmission, such as wireless speaker, allowing

smart device or computer to transmit audio signal to such devices.

GP

UA

D

RT

SP

I2
C

I

RF CPU

US

B

Tx/

IO

Rx

MIC

I2S

3.3

rev. 0.9 06232016

26MHz
crystal

GWBMA1x

SD/

DC/DC

4. Block Diagram

5. Parameters

Item

Parameter

Wireless

Hareware

Bluetooth version

protocols

modulation

frequency range

Tx power

Sensitivity

S/N ratio

Antenna

Operating voltage

Current consumption

Operating temperature

Storage temperature

Bluetooth V4.2+EDR

HFP/HSP,OPP,A2DP/AVRCP,PBAP profiles

PSK3bps, π/4-DQPSK，8DPSK

2.402GHz - 2.480GHz

Fulfil FCC Class2 requirement，Max Tx. power is +5dbm

-90dbm

82db

PCB antenna .

3.2-4.2V

45mA when playing music，32mA when pause

-25℃ - 60

-40℃ - 135

℃

℃

rev. 0.9 06232016

Expansion interface

I2S interface

Dimension (mm)

USB，UART，GPIO，IIC，IIS

data: 16bit;

sampling rate：8KHz，16KHz，22.05KHz，44.1KHz，48KHz

19 x 32x 1

GWBMA1x

6. Firmware

GWBMA1x comes with standard firmware with either analog output (Pin 29 -30) or digital output (IIS).

The firmware already embedded all the basic features, such as Bluetooth Audio, key input, LED

control..etc. Customer needs no engineering resource on those basic features.

Internal codec firmware

GWBMA1X embedded with internal codec, which output analog signal directly. Customer can simply

connect GWBMA1x analog output to earphone for audio play back, or to an audio amplifier.

External codec firmware

With this firmware, GWBMA1x will by-pass its internal codec and directly output the digital audio

signal received from wireless side to I2S output, which is connected to an external codec. Customer

can select different codec in order to satisfies different sound quality requirements. Beside the codec

feature, any other feature of this firmware will be same as the Internal code firmware.

Customised firmware

GWBMA1X is a high performance and flexibility Bluetooth audio module, and there are many rooms

for embedded features. It is possible to provide a customised firmware base on customer’s

requirement base on the module hardware. Customer may contact us through our local partners for

such customisation service. NRE will be needed for customisation service.

Firmware loading

Firmware can be loaded into GWBMA1X module through pin 16 and 17 by a JTAG adaptor. A window

base application will be provided for loading a GWBMA1X firmware from computer to the module.

rev. 0.9 06232016

GWBMA1x

7. GWBMA1X diagram

8. Pin definition

pin name description

pin

name

description

1 GND Ground

2 SDA UART RXD

3 SCL UART TXD

4 I2S_DI I2S Data in

5 I2S_DO I2S Data out

6 LRCK I2S L/R channel clock

7 SCLK I2S BCLK

8 MCLK I2S Configurable Clock OUT

9 GND Ground

10 GPIO 3.7 General purpose IO

11 SDDAT3 General purpose IO

12 ADC1 GPADC Input Channel 1

13 SDDAT2 General purpose IO

14 SDDAT1 General purpose IO

15 SDDAT0 General purpose IO

16 SDCLK/HRX Host data rx

19 GND Ground

20 AVDD33 3.3V output

21 nRESET Chip reset

22 VIN Power input

23 USBDN USB D-

24 USBDP USB D+

25 SDA Serial Data Line

26 SCL Serial Data Line

27 GPIO1.2 General purpose IO

28 GPIO1.3 General purpose IO

29 LOUT Audio output Left

30 ROUT Audio output Right

31 MICP Mic input +

32 MICN Mic input -

33 MICBAS Mic bias

34 AGND Analog ground

17 SDCMD/HTX Host data tx

18 GND

rev. 0.9 06232016

Ground

GWBMA1x

35 ADC0 GPADC Input Channel 1

36 GND

Ground