MD-7EM Application Note
1. Module Features
-Bluetooth V1.2 Compliant
-Dual UART Port
-16-bit Audio CODEC
2. Specification
-Operating Conditions
Supply Voltage: 2.4
–
3.6V
Temperature Range: -20 ~ 70℃
-Radio Characteristics
Receiver Sensitivity: -87dBm(Typical)
Transmitter Power: +16dBm(Typical)
3. Applications
-Stereo Headphones
-Echo Cancellation
-Automotive hands free kits
-High Performance Telephony personal
-Enhanced Audio Applications
4. Features
-Size (30 x 16.2 x 1.72 mm)
-Surface Mountable
-Support PCM interface for SCO
-Support Kalimba DSP
5. Descriptions
MD-7EM is Class 1 Bluetooth Stereo Audio Module for High Performance Telephony
Headsets, Enhanced Audio Applications, other A/V Applications. It is designed to be
used as a universal Bluetooth Module of Bluetooth specification version 1.2 which can
be
deployed
to
implement
versatile
wireless
applications
such
as
voice
communications. The Band-pass filter and balun are integrated into the substrate.
6. Block Diagram
7. Electrical Characteristics
Absolute Maximum Ratings
Parameter
Temperature
Supply Voltage(V_PA)
Supply Voltage(VDD)
Min
-20
3.2
2.4
Max
70
3.4
3.6
Unit
℃
V
V
Recommended Operating Conditions
Parameter
Supply Voltage(V_PA
Supply Voltage(VDD)
Min
3.3
2.6
Max
Unit
V
3.3
V
9. Pin Description
Pin NO
Pin Name
GND
V_PA
PIO_2
PIO_3
PIO_8
PIO_9
PIO_10
PIO_11
AIO_1
AIO_0
AUD_OUT_LP
AUD_OUT_LN
AUD_OUT_RN
AUD_OUT_RP
AUD_IN_LP
AUD_IN_LN
AUD_IN_RP
AUD_IN_RN
VDD
RESET
USB_DN
USB_DP
UART_RTS
UART_CTS
UART_RX
UART_TX
PCM_IN
PCM_SYNC
PCM_CLK
PCM_OUT
SPI_MOSI
SPI_MISO
SPI_CSB
Description
Common Ground
Power Amp power supply
Programmable input/output line
Programmable input/output line
Programmable input/output line
Programmable input/output line
Programmable input/output line
Programmable input/output line
Programmable input/output line
Programmable input/output line
Speaker output positive (Left channel)
Speaker output negative(Left channel)
Speaker output negative(Right channel)
Speaker output positive(Right channel)
Audio Signal input positive(Left channel)
Audio Signal input negative(Left channel)
Audio Signal input positive(Right channel)
Audio Signal input negative(Right channel)
Module power supply
Module reset input. Reset if high>5ms to cause
USB data minus
USB data plus
UART request to send active low
UART clear to send active low
UART data input
UART data output
Pulse Code Modulation Synchronous data input
Pulse Code Modulation Synchronous data sync
Pulse Code Modulation Synchronous data clk
Pulse Code Modulation Synchronous data output
Serial Peripheral Interface data input
Serial Peripheral Interface data output
Chip select for Synchronous Serial Interface
Pad Type
VSS
V_PA
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
Analogue
VDD
CMOS input
Bi-directional
Bi-directional
CMOS output
CMOS input
CMOS input
CMOS output
CMOS input
Bi-directional
Bi-directional
PCM output
CMOS input
CMOS output
CMOS input
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
SPI_CLK
PIO_7
PIO_6
PIO_5
PIO_4
RF_IN
GND
GND
GND
AIO_3
GND
GND
GND
GND
Serial Peripheral Interface data clock
Programmable input/output line
Programmable input/output line
Programmable input/output line
Programmable input/output line
Connect to Antenna(for RF Signal)
Common Ground
Common Ground
Common Ground
Programmable input/output line
Common Ground
Common Ground
Common Ground
Common Ground
CMOS input
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Analogue
VSS
VSS
VSS
Bi-directional
VSS
VSS
VSS
VSS
10. UART Interface
MD-7EM is Universal Asynchronous Receiver Transmitter (UART) interface provides
a simple mechanism for communicating with other serial device using the RS232
standard.
When MD-7EM is connected to another digital device, UART_RX and UART_TX
transfer data between the two devices. The remaining two signals, UART_CTS,
UART_RTS, can be used to implement RS232 hardware flow control control where
both are active low indicators.
All UART connections are implemented using CMOS technology and have signaling
levels of 0V and VDD
FPGA/CPLD
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