Gigawit Electronics GWBMA1X User Manual

Gigawit Bluetooth Audio module

GWBMA1x Datasheet

(preliminary)

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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

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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

℃

℃

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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.

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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

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Ground

GWBMA1x

35 ADC0 GPADC Input Channel 1

36 GND

Ground

9. Reference design and Evaluation kit

Suggest reference circuit

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Suggest external codec circuit

GWBMA1x

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GWBMA1x

10. Evaluation board

GWBMA1X evaluation board provides a complete circuit GWBMA1X where customer

can evaluate each feature of the standard firmware, or any customised firmware.

Push buttons

GWBMA1X evaluation board

Except the RST button (system reset), 5 push buttons for controlling the music

Play : Play, pause music and answer call

Prev : Jump to previous song

Next : Jump to next song

Vol+, Vol- : Volume increment/decrement

Codec output

When external codec firmware loaded, the external codec on the EVK will be activated.
The on board codec will then convert digital data from the module to LINE OUT and
convert audio signal from LINE IN to the module.

User can also connect the I2S related signal pin to his own codec circuit.

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GWBMA1x

When internal codec firmware is loaded, the module will decode the signal internally
and output audio signal on the board; on the other hand, audio from MIC will also be
coded in the module.

Battery charger

A Li-ion charger is also on board, customer can simply solder a 3.7V Li-ion battery to

the board. The RED LED will turn on when charging.

USB connector

It is used as power supply of the board, and battery charging as well (if Li-ion battery
connected). Data pin is also connect to GWBMA1X USB port, but is not yet enabled
until future or customised firmware.

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11. Layout requirement

GWBMA1X is a sensitive RF device, and it is suggestion to be put on

In order to obtain the best performance, GWBMA1X should be placed on corner of PCB, and keep

certain distance from other components, especially metal components, such are speaker, transformer,

battery, heat sink and metal plate.

The diagram shows the layout for GWBMA1X module. Inappropriate installation may deteriorate the RF

performance.

GWAPA0x layout recommendation

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GWBMA1x

12. GWBMA1X dimension

Figure [11]: GWBMA1X dimension

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GWBMA1x

13. Naming

GW

BMA

0x

Variants Bluetooth Audio Gigawit

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GWBMA1x

14. Contact information

Head quarter:

Room 308, Building 25, Keyuan West Industrial Area, Nanshan District,

Shenzhen City, Guangdong Province, China

Tel: [phone]

Fax: [phone]

E-mail: [e-mail]

Sales and marketing office:

Tel: [phone]

Fax: [phone]

E-mail: [e-mail]

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GWBMA1x

(OEM) Integrator has to assure compliance of the entire end-product incl. the integrated RF Module.
For 15 B (§15.107 and if applicable §15.107) compliance, the host manufacturer is required to
show compliance with 15 while the module is installed and operating.

Furthermore the module should be transmitting and the evaluation should confirm that the module's
intentional emissions (15C) are compliant (fundamental / out-of-band). Finally the integrator has
to apply the appropriate equipment authorization (e.g. Verification) for the new host device per
definition in §15.101.

Integrator is reminded to assure that these installation instructions

will not be made available to the end-user of the final host device.

The final host device, into which this RF Module isintegrated" hasto be labelled

with an auxilliary lable stating the FCC IDofthe RF Module,

such as "Contains FCC ID: QECGWBMA1X"

"This device complies with part 15 of the FCC rules. Operation is subject to the following two

conditions:

(1)this devicemay not cause harmful interference, and

(2)this devicemust accept any interference received, including

interference thatmay cause undesired operation."

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital

device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable

protection

against harmful interference in a residential installation. This equipment generates, uses and can

radiate radio frequency energy and, if not installed and used in accordance with the instructions,

may cause harmful interference to radio communications. However, there is no guarantee that

interference will not occur in a particular installation. If this equipment does cause harmful

interference to radio or television reception, which can be determined by turning the equipment

off and on, the user is encouraged to try to correct the interference by one or more of the

following measures:

--Reorient or relocate the receiving antenna.

--Increase the separation between the equipment and receiver.

--Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

--Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications to this unit not expressly approved by the party responsible for

compliance could void the user's authority to operate the equipment.