30
page 1 BM20 Bluetooth ® Evaluation Board User ’ s Guide
page 1
BM20 Bluetooth® Evaluation Board User’s Guide
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 2
Index
Preface ............................................................................................................................................ 4
1 OVERVIEW ................................................................................................................................... 4
1.1 INTRODUCTION ................................................................................................................................................ 4 1.2 BM20 EVALUATION BOARD FEATURES ......................................................................................................... 4 1.3 BM20 EVALUATION BOARD CONTENTS ........................................................................................................ 5
2. Getting Started ........................................................................................................................... 8
2.1 INTRODUCTION ................................................................................................................................................ 8 2.2 HARDWARE REQUIREMENTS ......................................................................................................................... 8 2.3 APPLICATION DEMONSTRATION .................................................................................................................... 8 2.4 SOFTWARE/UTILITY REQUIREMENTS ......................................................................................................... 10 2.5 MODULE CONFIGURATION ........................................................................................................................... 23
APPENDIX A. BM20 AUDIO EVALUATION BOARD SCHEMATICS ........................................ 24
APPENDIX B. CLASS D AMPLIFIER DAUGHTER BOARD ...................................................... 29
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 3
Abbreviations List: HFP: Hands-free Profile AVRCP: Audio Video Remote Control Profile A2DP: Advanced Audio Distribution Profile HSP: Headset Profile NFC: Near Field Communication
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 4
1 OVERVIEW 1.1 INTRODUCTION This user’s guide describes the hardware and software setup for the BM20 Bluetooth® Evaluation Board.
This board contains the hardware needed to evaluate the BM20 Bluetooth module. The BM20 module is
mounted to an evaluation board that demonstrates the module’s key features. The evaluation board contains:
Stereo audio output
Easy access to IO pins
6 push buttons to control audio playback
Status LEDs
The BM20 supports the following Bluetooth profiles: A2DP, AVRCP, and HFP/HSP
A2DP stereo audio (Sink mode wi support for Sub-Band Coding (SBC),
AVRCP media player remote control
HFP/HSP for accepting a phone call support.
For data sheet and other details related to BM20 module, refer to the Microchip web
site at http://www.microchip.com.
This chapter discusses the following topics:
BM20 Evaluation Board Features
BM20 Evaluation Board Contents and Part Details
1.2 BM20 EVALUATION BOARD FEATURES The BM20 Evaluation Board has the following features:
Fully qualified Bluetooth version 4.1 module, fully compatible with Bluetooth version 3.0, 2.0, 1.2
system.
Embedded BM20 module with postage-stamp size form factor of 15 x 29 x 2.5 mm (include shielding
case)
Embedded Bluetooth stack profiles: A2DP, AVRCP, and HFP/HSP
Stereo audio output for highest quality audio
Castellated SMT pads for easy and reliable PCB mounting
Environmentally friendly, RoHS compliant
Bluetooth SIG certified
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
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1.3 BM20 EVALUATION BOARD CONTENTS BM20 Evaluation Board contains the following components as shown in Figure 1-1 which describes the
evaluation board’s interfaces and connectors. Table 1-1 describes the various components of the evaluation
board.
FIGURE 1-1: BM20 EVALUATION BOARD
Audio Output (JP23) MIC (JP22) NFC tag connector (JP3)
Pin Description Pin Description Pin Description
1 AOHPL 1 MIC_P1 1 NFC_P
2 AOHPM 2 AGND 2 NFC_N
3 AOHPR 3 MIC_N1
1 2 3 1 2 3 1 2
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
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IO Connector (J1)
Pin Description
1 P0_0
2 P3_0
3 P2_0
4 P1_5
5 P0_4
6 P0_1
7 P2_4
8 P0_2
9 P0_3
10 P0_5
11 P2_7
12 P2_4
External AMP. Connector (JP26) Battery connector (JP20) and Jack (JP19)
(Alternative for BAT_IN)
Pin Description Pin Description
1 EXT_AMP_EN 1 BAT_IN
2 SPKR 2 GND
3 AGND
4 SPKL
5 AMP_POWER
1 2 3 4 5 2 1 +
1 3 5 7 9 11
2 4 6 8 10 12
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
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TABLE 1-1:BM20 EVALUATION BOARD HARDWARE
Hardware Component Description
BM20 Bluetooth® 4.1 Module
USB Connector DC 5V input, USB to UART for EEPROM R/W
BAT connector & Jack JP20 and JP19 , alternative for BAT_IN
Audio Out Audio 3.5 mm jack for audio playback(P6).
External AMP Connector JP26
Audio In Audio 3.5 mm jack for Mono microphone input(P5) and AUX input(P7)
Status LEDs Red and Blue LEDs show the pairing/connection status
MFB Button Switch to turn on/off BM20 module (SW7; Button 0 in UI)
Play/Pause Button Button to play or pause the audio playback (SW8; Button1 in UI)
Previous Track Button Button to skip track backwards (SW4; Button 5 in UI)
Next Track Button Button to skip track forwards(SW5; Button 4 in UI)
Volume Up Button Button to increase volume (SW9; Button 2 in UI)
Volume Down Button Button to decrease volume (SW10; Button 3 in UI)
Reset Button Reset system (SW11)
NFC Tag Connector NFC Tag connector.(For NFC tag without Rectifier Circuit)(JP3)
MP Tool Interface Interfaces connect to VICTORIA board when use MP Tool
MCU Interface Interfaces connect to PIC32 Platform.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 8
2. Getting Started 2.1 INTRODUCTION This chapter describes how the BM20 Evaluation Board works. Certain hardware and utilities are essential to
support the evaluation/development of demo applications. This chapter discusses the following topics:
Hardware Requirements
Software/Utility Requirements
Module Configuration
2.2 HARDWARE REQUIREMENTS
2.2.1 HARDWARE SETUP To setup the evaluation hardware, perform the following steps:
1. Make sure pin 1 / 2 / 3 of “SW12” in “Off / Off / On” state make .system in application mode.
2. Connect the portable mini-speaker 3.5 mm to the stereo audio out connector (P6).
2.2.2 USING THE EVALUATION BOARD 1. Connect Li-Ion batteries to JP20 or JP19.
2. Click MFB button to turn-on and enter pairing mode. The status LEDs will blink. Now the BM20 Evaluation
board should be discoverable.
3. Turn on Bluetooth device manager on a host device (PC or smartphone), the host device will display a list
of discoverable Bluetooth devices. The board display as “EDDY SHS”.
4. If the pairing with the device is successful, BM20 evaluation board can connect to the host device. Once
connected, BM20 evaluation board enables Advanced Audio Distribution Profile (A2DP) for audio
playback and Audio Video Remote Control Profile (AVRCP) for player control.
2.3 APPLICATION DEMONSTRATION
2.3.1 AUDIO DEMONSTRATION In this demonstration, user can play an audio stream on both BM20 evaluation boards using a computer or
smartphone. The following are the steps to perform the demonstration.
1. Connect BM20 evaluation board to a host device (PC or smartphone) that has an audio source.
2. Connect headphones (or mini-speakers) to BM20 evaluation board P6.
3. Open the audio source on the host device. Microchip recommends using media player.(e.g. Microsoft
Media Player, iTunes, and Android).
4. Start the audio stream on the media player.
When BM20 evaluation board is connected to an audio source compatible with Bluetooth AVRCP, the audio
control buttons are use to:
Control the volume of audio output.
Go to the previous track.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 9
Go to the next track.
Start / stop playing the current track.
FIGURE 1-2: BM20 EVALUATION BOARD AUDIO CONTROL BUTTONS
FIGURE 1-3: BM20 EVALUATION BOARD WITH EXTERNAL CLASS-D AMPLIFIER
(It need modify the setting in UI to support external amplifier)
2.3.2 HSP/HFP DEMONSTRATION
In this demonstration, user can explore the hands-free profile setting to receive an incoming voice call from a
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 10
paired smartphone. This demonstration requires a microphone. It would be good to use a PC
headset/microphone (with two-plugs). The following are the steps to perform the demonstration.
1. Connect the headset/microphone to BM20 evaluation board’s audio out connector (P6) and MIC input
(P5) respectively.
2. Connect BM20 evaluation board to a smartphone that supports the A2DP and HFP/HSP Bluetooth
profiles.
3. From another one phone, initiate a call to the smartphone that is paired with BM20 evaluation board. The
A2DP stream pauses and the ringtone plays on the headset/microphone.
4. Click button “MFB” on BM20 evaluation board to accept the incoming call.
2.4 SOFTWARE/UTILITY REQUIREMENTS
2.4.1 UI SETTING
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 11
Step1. Open UI tool
Step2. Firstly, you can load default UI setting or previous setting file.
Step3. Click “Edit” to modify the settings meet your needs.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 12
Step4. In the main settings, it can enable or disable supported profile or function which system need.
Click “Next” for other setting.
Step5. You can do system and functional setting in these pages.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 13
Click “Help” you can get more detail information.
Step6. After finish parameter set up, click “Finish” button and a message will remind you check EEPROM
size on your system.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 14
Step7. Click “Save” button to save these UI parameter as a “.txt” file
Step8. We will use MPET tool to merge it with EEPROM table and use EEPROM tool load these parameter
to system.
2.4.2 DSP TOOL SETTING
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 15
Step1. Open DSP tool
Step2. Select IC version ““IS2020_XXX_SHS” (XXX is the version of chip, e.g. IS2020S-203)
Step3. You can setup all voice and audio function in these pages.
Step4. Click “Save” button to save these DSP parameter as a “.txt” file after finish all DSP setting.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 16
Then use MPET tool to merge it with EEPROM table and use EEPROM tool load these parameter to system.
2.4.3 MERGE TOOL SETTING
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 17
Step1. Open MPET tool, click “Next” to set up.
Step2. Select “Default” to use full EEPROM table to merge UI and DSP parameter.
Step3. Select the bin file (full EEPROM table) and click “ Next”
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 18
Step4. If the bin file had included UI, DSP or patch code parameter, you can see them in block 1 as the figure below. If you want keep the in your new system, you can select the item which you want to keep and use “pull down” button to add them to merge list. If you want to add new parameter (e.g. UI and DSP parameter), click “+” button to add these files into tool for merge with EEPROM table.
Step5. Select an output path and create a name for the merged EEPROM table.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 19
Step6. Click “Generate” button to generate the new EEPROM table.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 20
Step7. Select if you want use new setting of these parts.
Step8. Now you have a merged patch file (*.ipf file).
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 21
2.4.4 Procedure to Update EEPROM Parameters
Step 1. Make sure SW12 in “ROM TEST” mode. Step 2. Connect EVB “P1” port and PC by USB cable. LED1 & LED2 on EVB will keep lighting. Step 3. Run the E2PROM_tool.exe program and a window will be come up as below
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 22
Step 4. Specify the COM Port.
Step5. Press ”Browse” to choose the file where you want to write EEPROM table or patch file.
Step6. Press” Write” to write these setting to EEPROM
Step7. After finish data update, remove USB cable and make SW12 to “ROM APP” mode and reboot.
Now EVB can use the new setting after updated EEPROM parameter.
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 23
2.5 MODULE CONFIGURATION
2.5.1 Mode Settings Setting in Mode Switch:
For ROM chip application
Mode SW12 Setting Switch 12 PIN Definition
Test Mode
1: ON (P2_0: LOW) 2: OFF (P2_4: HIGH) 3: ON (EAN: HIGH)
Application Mode
1: OFF (P2_0: HIGH) 2: OFF (P2_4: HIGH) 3: ON (EAN: HIGH)
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
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APPENDIX A. BM20 AUDIO EVALUATION BOARD SCHEMATICS EVB block diagram
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 25
PC
B1
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BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 26
USB_GND
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VICTORIA/EDGAR II INTERFACE
VD
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GND
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29
B28
28
A27
27
B26
26
A25
25
B24
24
A23
23
B22
22
A21
21
B20
20
A19
19
B18
18
A17
17
B16
16
A15
15
B14
14
A13
13
B12
12
A11
11
B10
10
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4A
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2
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5A
77
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1
A9
9
BA
T_
IN
RST_N
P2_4
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P2_0
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 27
AM
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AO
HP
LA
OH
PM
P6
PJ-2
001-5
K
123 45
SPK JACK
R35
NP
-0402
R34
NP
-0402
C48
1u/1
6V
C37
1u/1
6V
C46
NP
-0402
C45
NP
-0402
P3_0
R1
22K
12
C18
2.2
u/6
.3V
R9
1K
12
C19
2.2
u/6
.3V
R10
1K
12
MIC
_B
IAS
P5
PJ-2
001-5
K
123 45
JP
22
JP
1x3
1 2 3
MIC1
MIC
_N
1
MIC
_P
1
C21
0.1
u/1
0V
C23
220p/5
0V
C25
0.1
u/1
0V
AO
HP
MA
OH
PM
JP
23
JP
1x3
1 2 3
AO
HP
R
AO
HP
L
SP
KR
SP
KL
C78
1u/1
6V
C77
1u/1
6V
AO
HP
R
AM
P_P
OW
BA
T_IN
AD
AP
_IN
C49
1u/1
6V
R22
1K
1 2
R23
20K
1 2
GD
S
Q4
STS
2301
13
2
EXT POWER TREE
C52
4.7
u/1
0V
AIR
AIL
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 28
RESET PUSH BUTTON
GD
S
Q9
STS
23
01
13
2
R2
1
100K
12
SL
IDE
_S
W
R3
610K
1 2
GD
S
Q10
STS
23
06
31
2
R3
7
100K
1 2
SW
6S
W-1
BIT
12
SY
S_
PW
R
P0_0
VD
D_
IO
MFB
MF
B
Bo
ard
Na
me
Siz
eT
itle
Re
v
Da
te:
Sheet
of
P/N
PU
SH
BU
TT
ON
/SW
ITC
H3
.0
BM
20 E
VB
44
We
dn
esd
ay
, M
ay
20
, 2
01
5
0355
5F
, N
o.5
, In
dustr
y E
. R
d. V
II, H
sin
chu S
cie
nce P
ark
,
Hsin
ch
u C
ity
30
07
8,
Ta
iwa
nT
EL
.
88
6-3
-57
78
38
5
P0_3
MUSIC CONTROL PUSH BUTTON
SY
S_
PW
R
C5
71
0u
/16
V
PLAY/PAU
FWDM
FB
SLIDE SWITCH
SW
4T
S0
8M
-PF
21
SW
8T
S0
8M
-PF
21
SW
10
TS
08
M-P
F
21
SW
5T
S0
8M
-PF
21
REW
C3
81
5p
/50
V
SW
9T
S0
8M
-PF
21
C4
11
5p
/50
V
P2_7
C3
91
5p
/50
V
SW
7T
S0
8M
-PF
21
SW
11
TS
08
M-P
F
21
C4
01
5p
/50
V
VOL+
VOL-
P0_5
C4
21
5p
/50
V
P0_2
P0_1
RS
T_
N
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 29
APPENDIX B. CLASS D AMPLIFIER DAUGHTER BOARD BM20 EVB reserves an interface (JP26) to connect with an external class D amplifier daughter board for speaker application demonstration. Here is a daughter board example of NAU8223 3.1W class D amplifier.
On the daughter board, we reserve pin header for amplifier gain setting, L/R channel speaker connector and BM20 EVB connector. It can be connected with BM20 EVB to emulate a speaker application.
The schematics of the daughter board as below:
Speaker Connector for L/R channel
BM20 EVB Connector
Amplifier Gain Setting
BM20 BLUETOOTH
EVALUTATION BOARD USER’S GUIDE
page 30
C2
30
.47
u/5
0V
C2
40
.47
u/5
0V
AL
AR
P6
PJ-2
00
1-5
K
123 45
EN
AR
AL
AP
JP
6
JP
2x4
1357
2468
C7
10
00
p/1
6V
C8
10
00
p/1
6V
C1
0
10
00
p/1
6V
C1
1
10
00
p/1
6V
R3
100K
1 2
R4
100K
1 2
VD
DV
DD
U3
NA
U8
22
3OU
TR
P1
VD
D2
NC
3
EN
4
INR
5
IPR6
GS7
VDD8
VSS9
IPL10
INL
11
NC
12
NC
13
VD
D14
OU
TL
P15
VSS16 OUTLN17 VDD18 OUTRN19 VSS20 VSS21
VD
D
CN
1
CO
NN
1X5
1 2 3 4 5
JP
1JP
2x3
135
246
VD
D
VD
D
VD
D
L_VONL_VOP
AP
EN
R_VONR_VON
C1
2
0.4
7u
/50
V
FB
1
GS
MA
20
12
09
12
JP
7JP
2x3
135
246
R_VOP R_VOP
C1
3
0.4
7u
/50
V
GS
GS vs. Gain Setting
GAIN(dB)
24
18
12
6
JP
2JP
1x21 2
0
JP
3JP
1x2
1 2
GS
GND
100K to GND
VDD
100K to VDD
FLOATING
JP
4JP
1x21 2
JP
5JP
1x2
1 2
AL
AR
AL
C2
50
.1u
/16
V
C2
60
.1u
/16
V
C2
70
.1u
/16
V
C2
80
.1u
/16
V
L_VOP
L_VON
D1
LL4148
21
FB
2G
SM
A2
01
20
9
12
FB
3G
SM
A2
01
20
9
12
VD
D
FB
5G
SM
A2
01
20
9
12
FB
4G
SM
A2
01
20
9
12
L_IN
R_IN
R_OUT
L_OUT
JP
8JP
1x21 2
JP
9
JP
1x2
1 2L1
NP
-12
06
1 2
L2
NP
-12
06
1 2
L3
NP
-12
06
1 2
L4
NP
-12
06
1 2
R5
10K
1 2
P N GND
N P GND
C1
41
0u
/10
V
C2
01
0u
/10
V
C2
11
0u
/10
V
C2
21
0u
/10
V
L_P N
R_P N
C1
7
10
p/5
0V
C1
81
0p
/50
V
C1
6
39
p/5
0V
C1
93
9p
/50
V
AR
Bo
ard
Na
me
Siz
eT
itle
Re
v
Da
te:
Sheet
of
P/N
MA
IN C
IRC
UIT
1.0
NA
U8223
ISS
C T
echno
log
ies C
orp
.A
DD
.
4F
, N
o.8
, D
usin
g R
d.,
Hsin
ch
u S
cie
nce
Pa
rk,
Hsin
ch
u C
ity
30
07
8,
Ta
iwa
nT
EL
.
88
6-3
-57
78
38
5
A
11
Mo
nd
ay
, O
cto
be
r 1
5,
20
12
0130
R2
4K
7
1 2
+C
37
10
0u
/16
V
1 2
+C
31
00
u/1
6V
1 2
