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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
11. PCM Interface
Pulse Code Modulation (PCM) is a standard method used to digitize human voice patterns for transmission over digital communication channel. Through its PCM interface, MD-7EM has hardware support for continual transmission reception of PCM data, thus reducing processor overhead for wireless application. MD-7EM offers a Bidirectional digital audio interface that route directly into the baseband layer of the Module firmware. It does not pass through the HCI protocol layer. Hardware on MD-7EM allows the data to be sent to the received from a SCO connection. MD-7EM can be configured as PCM interface Master generating an output clock of 128, 256 or 512KHz. When configured as PCM interface slave it can operated with input clock up to 2048KHz. MD-7EM is compatible with a variety of clock formats, including Long Frame Sync, Short Frame Sync and GCI timing environments. It supports 13-bit or 16-bit liner, 8-bit u-law or A-law companied sample formats at 8K samples/s and can receive and transmit on any selection of the first four slots following PCM_SYNC.
12. USB Interface MD-7EM USB devices contain a full speed (12Mbit/s) USB interface that is capable of driving of a USB cable directly. No external USB transceiver is required. The device operates as s USB peripheral, responding to requests from a master host controller such as a PC. Both the OHCI and UHCI standards supported. The set of the USB endpoints implemented behave as specification V1.2. As USB is Master/Slave oriented system (in common with other USB peripheral), MD7EM only supports USB slave operation. MD-7EM features an internal USB pull-up resistor. This pulls the USB+ pin weakly high when MD-7EM is ready to enumerate. It signals to the PC that it is a full Speed (12Mbit/s) USB device.
13. Audio Interface
The audio interface circuit consists of audio CODEC, dual audio inputs and outputs, and a PCM, I2S or SPDIF configurable interface V1.2. The CODEC supports stereo playback and recording of audio signals at multiple sample rates with a resolution of 16-bit. The ADC and the DAC of the CODEC each contain two independent channels. Any ADC or DAC channel can be run at its won independent sample rate. PCM Interface PCM_OUT PCM_IN PCM_SYNC PCM_CLK SPDIF Interface SPDIF_OUT SPDIF_IN I2S Interface SD_OUT SD_IN WS SCK
< Alternative Functions of the Digital Audio Bus Interface On the PCM Interface> The audio input circuitry consists of a dual audio input that can be configured to be either single ended or fully differential and programmed for either microphone or line input. It has a programmable gain stage for optimization of different microphones. The digital audio bus supports various digital bus standard, which include I2S, and the interfaces contained within the IEC 60958 specification such as SPDIF and AES3.
14. Stereo Audio Interface.
The main features of the interface are: -16-bit resolution, standard, sample rates of 8KHz, 11.025KHz, 16KHz, 22.050KHz, 32KHz, 44.1KHz and 48KHz(DAC only) -Dual ADC and DAC for stereo audio. -Integrated amplifiers for driving microphone and speakers with minimum external components -Stereo and mono analogue input for voice band and audio band -Stereo and mono analogue output for voice band and audio band -Support for stereo digital audio bus standards such as I2S -Support for IEC-60958 standard stereo digital bus standards i.e. S/PDIF and AES3EBU -Support for PCM interfaces including PCM master CODEC that require an external system clock.
The stereo audio CODEC uses a fully differential architecture in the analogue signal path, which results in low noise sensitivity and good power supply rejection while effectively doubling the signal amplitude. It operates from a single power-supply of 1.8V and uses a minimum of external components.
14. Pin Map
TOP VIEW
15. Dimension
.sch-1 - Tue Oct 02 18:23:48 2007

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