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BM20 Schematic ( PDF Datasheet ) - ISSC

Teilenummer BM20
Beschreibung Bluetooth 4.1 Stereo Audio Module
Hersteller ISSC
Logo ISSC Logo 




Gesamt 30 Seiten
BM20 Datasheet, Funktion
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 mm3
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 I2S 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/
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)
Page 1






BM20 Datasheet, Funktion
Stereo Module
Pin No.
7
8
9
10
11
12
13
14
15
16
17
Pin type
O
O
O
P
I
I
P
I
I
I
P
18 I/O
19 P
20 P
21 P
22 -
23 P
24 P
25 P
26 I
27 I
28 I
29 I
30 I
31 I/O
32 O
33 I
34 I
35 I
Name
SPKR
AOHPM
SPKL
VDDA
MIC1_P
MIC1_N
MIC_BIAS
AIR
AIL
RST
VCC_RF
P0_1
VDD_IO
ADAP_IN
BAT_IN
NC
GND
SYS_PWR
BK_OUT
MFB
LED1
LED2
P2_4
P0_2
P0_3
HCI_TXD
HCI_RXD
P0_5
P2_7
Description
R-channel analog headphone output
Headphone common mode output/sense input.
L-channel analog headphone output
Positive power supply/reference voltage for CODEC, no need to add power
to this pin.
Mic 1 mono differential analog positive input
Mic 1 mono differential analog negative input
Electric microphone biasing voltage
R-channel single-ended analog inputs
L-channel single-ended analog inputs
System Reset Pin, Low: reset
1.28V RF LDO output, no need to add power to this pin.
IO pin, default pull-high input (Note 1)
1. FWD key when class 2 RF (default), active low.
2. Class1 TX Control signal of external RF T/R switch, active high.
Power output , no need to add power to this pin
5V Power adaptor input
3.3V~4.2V Li-Ion battery input
No Connection
Ground Pin
System Power Output
BAT mode: 3.3~4.2V
Adapter mode: 4.0V
1.8V buck output, no need to add power to this pin
1. Power key when in off mode
2. UART_RX_IND: MCU use to wakeup BT (Note 1)
LED Driver 1
LED Driver 2
IO pin, default pull-high input
System Configuration,
L: Boot Mode with P2_0 low combination
IO pin, default pull-high input (Note 1)
Play/Pause key (default), active low.
IO pin, default pull-high input (Note 1)
1. REV key (default), active low.
2. Buzzer Signal Output
3. Out_Ind_1
4. Class1 RX Control signal of external RF T/R switch, active high.
HCI-UART TX data
HCI-UART RX data
IO pin, default pull-high input (Note 1)
Volume down (default), active low.
IO pin, default pull-high input (Note 1)
Volume up key (default), active low.
Page 6

6 Page









BM20 pdf, datenblatt
Stereo Module
Here are some suggestions of UART control signal timing sequence:
FIGURE 2-2: POWER ON/OFF SEQUENCE
Page 12

12 Page





SeitenGesamt 30 Seiten
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