BM20/BM23
Bluetooth
®
4.1 Stereo Audio Module
Features:
Complete, Fully Certified, Embedded
2.4 GHz Bluetooth® Version 4.1
Module
Bluetooth Classic (BDR/EDR)
Bluetooth SIG Certified
Onboard embedded Bluetooth Stack
Transparent UART mode for seamless serial
data over UART interface
Easy to configure with Windows GUI or direct
by MCU
Firmware can be field upgradable via UART
Compact surface mount module: 29 x 15 x
2.5 mm
3
Castellated surface mount pads for easy
and reliable host PCB mounting
Environmentally friendly, RoHS compliant
Perfect for Portable Battery Operated
Devices
Internal Battery Regulator Circuitry
Worldwide regulatory certifications
Audio-In / Out
BM23 support digital audio I
2
S format.
BM20 support analog audio output.
Operational:
Operating voltage: 3.0V to 4.2V
Temperature range:
‐20C
to 70°C
Simple, UART interface
Integrated crystal, internal voltage
regulator, and matching circuitry
Multiple I/O pins for control and status
RF/Analog:
Frequency: 2.402 to 2.480 GHz
Receive Sensitivity:
‐91
dBm (2Mbps EDR)
Power Output: class 2 / +4dBm max.
Connection Distance: >10m
(free space and no interference)
Audio processor
Support 64 kb/s A-Law or
-Law
PCM format, or
CVSD (Continuous Variable Slope Delta
Modulation) for SCO channel operation.
Noise suppression
Echo suppression
SBC and optional AAC decoding
Packet loss concealment
Build-in four languages (Chinese/ English/
Page 1
Spanish/ French) voice prompts and 20 events for each
one (This function can be set up in “IS20XXS_UI” tool.)
Support SCMS-T
Audio Codec
20 bit DAC and 16 bit ADC codec
98dB SNR DAC playback
Peripherals
Built-in Lithium-ion battery charger (up to 350mA)
Integrate 3V, 1.8V configurable switching regulator and
LDO
Built-in ADC for battery monitor and voltage sense.
A line-in port for external audio input
Two LED drivers
Flexible HCI interface
High speed HCI-UART (Universal Asynchronous
Receiver Transmitter) interface (up to 921600bps)
MAC/Baseband/Higher Layer:
Secure AES128 encryption
Bluetooth profiles
- HFP v1.6
- HSP v1.1
- A2DP v1.2
- AVRCP v1.5
- SPP v1.0
- PBAP v1.0
Antenna:
Printed Antenna
Compliance:
Bluetooth SIG QDID: 58996
Module certified for the United States (FCC) and
Canada (IC), European Economic Area (CE),
Korea (LTA), Taiwan (NCC) and Japan (MIC)
FIGURE 1:
General Description:
Stereo module is a fully-certified
Bluetooth® Version 4.1 (BDR/EDR) module
for designers who want to add Bluetooth®
wireless audio and voice applications to their
products.
This Bluetooth SIG certified module
provides a complete wireless solution with
Bluetooth stack, integrated antenna, and
worldwide radio certifications in a compact
surface mount package, 29x15x2.5 mm
3
.
This stereo module built-in Li-Ion charger
and BM23 contain a digital audio interface. It
supports HSP, HFP, SPP, A2DP, and
AVRCP profiles. Both AAC and SBC codecs
are supported for A2DP. Note that the
customer must connect their own external
analog CODEC/DSP/amplifier and MCU for
audio output.
Applications:
Bluetooth sound bar
Bluetooth stereo speaker phone
Page 2
Stereo Module
Table of Contents
1.0 DEVICE OVERVIEW ............................................................................................................................. 4
2.0 APPLICATION INFORMATION ........................................................................................................... 10
3.0 ELECTRICAL CHARACTERISTICS ................................................................................................... 18
4.0 PRINTED ANTENNA INFORMATION ................................................................................................. 23
5.0 REFERENCE CIRCUIT ...................................................................................................................... 25
6.0 CERTIFICATION INFORMATION ...................................................................................................... 27
7.0 MODULE OUTLINE AND REFLOW PROFILE .................................................................................. 29
8.0 PACKAGING AND STORAGE INFORMATION ................................................................................. 34
APPENDIX .................................................................................................................................................. 37
Abbreviations List:
HFP:
Hands-free Profile
AVRCP:
Audio Video Remote Control Profile
A2DP:
Advanced Audio Distribution Profile
PBAP:
Phone Book Access Profile
HSP:
Headset Profile
SPP:
Serial Port Profile
Page 3
Stereo Module
1.0 DEVICE OVERVIEW
The stereo module series include BM20 and BM23. The chip integrates Bluetooth 4.1 radio
transceiver, PMU and DSP. Figure 1-1and 1-2 shows the application block diagram.
FIGURE 1‐1: BM20 Typical Application
The following depicts an example of BM20 module operate as an independent system or connected
to an MCU.
Audio Output
IS2020S
Microphone
16M Hz
Crystal
I2C
EEPROM
IC
BM20
UART
MCU
Option
Aux_In
FIGURE 1‐2: BM23 Typical Application
The following depicts an example of BM23 module connected to an MCU, external DSP/CODEC.
IS2023S
Microphone
16M Hz
Crystal
I2S
DSP
I2C
EEPROM
IC
BM23
UART
MCU
Aux_In
Page 4
Stereo Module
1.1 INTERFACE DESCRIPTION
BM20 pin diagram is shown in Figure 1-3. The pin descriptions are shown in Table 1-1
FIGURE 1-3: BM20 PIN DIAGRAM
TABLE 1‐1: BM20 PIN DESCRIPTION
Pin No.
Pin type
Name
Description
IO pin, default pull-high input (Note 1)
1
I/O
P0_0
1. Slide Switch Detector, active low.
2. UART TX_IND, active low.
Embedded ROM/External Flash enable
2
I
EAN
H: Embedded; L: External Flash
IO pin, default pull-high input (Note 1)
3
I
P3_0
Line-in Detector (default), active low.
IO pin, default pull-high input
4
I
P2_0
System Configuration,
H: Application L: Baseband(IBDK Mode)
IO pin, default pull-high input (Note 1)
1. NFC detection pin, active low.
5
I/O
P1_5
2. Out_Ind_0
3. Slide Switch Detector, active low.
4. Buzzer Signal Output
IO pin, default pull-high input. (Note 1)
6
I/O
P0_4
1. NFC detection pin, active low.
2. Out_Ind_0
Page 5
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