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 communications. The Band-pass filter and balun are integrated into the substrate. voice 6. Block Diagram 7. Electrical Characteristics Absolute Maximum Ratings Parameter Min Max Unit Temperature -20 70 ℃ Supply Voltage(V_PA) 3.2 3.4 V Supply Voltage(VDD) 2.4 3.6 V Recommended Operating Conditions Parameter Min 3.3 Supply Voltage(V_PA Supply Voltage(VDD) Max 2.6 Unit V 3.3 V 9. Pin Description Pin NO Pin Name Description Pad Type 1 GND Common Ground VSS 2 V_PA Power Amp power supply V_PA 3 PIO_2 Programmable input/output line Bi-directional 4 PIO_3 Programmable input/output line Bi-directional 5 PIO_8 Programmable input/output line Bi-directional 6 PIO_9 Programmable input/output line Bi-directional 7 PIO_10 Programmable input/output line Bi-directional 8 PIO_11 Programmable input/output line Bi-directional 9 AIO_1 Programmable input/output line Bi-directional 10 AIO_0 Programmable input/output line Bi-directional 11 AUD_OUT_LP Speaker output positive (Left channel) Analogue 12 AUD_OUT_LN Speaker output negative(Left channel) Analogue 13 AUD_OUT_RN Speaker output negative(Right channel) Analogue 14 AUD_OUT_RP Speaker output positive(Right channel) Analogue 15 AUD_IN_LP Audio Signal input positive(Left channel) Analogue 16 AUD_IN_LN Audio Signal input negative(Left channel) Analogue 17 AUD_IN_RP Audio Signal input positive(Right channel) Analogue 18 AUD_IN_RN Audio Signal input negative(Right channel) Analogue 19 VDD Module power supply VDD 20 RESET Module reset input. Reset if high>5ms to cause CMOS input 21 USB_DN USB data minus Bi-directional 22 USB_DP USB data plus Bi-directional 23 UART_RTS UART request to send active low CMOS output 24 UART_CTS UART clear to send active low CMOS input 25 UART_RX UART data input CMOS input 26 UART_TX UART data output CMOS output 27 PCM_IN Pulse Code Modulation Synchronous data input CMOS input 28 PCM_SYNC Pulse Code Modulation Synchronous data sync Bi-directional 29 PCM_CLK Pulse Code Modulation Synchronous data clk Bi-directional 30 PCM_OUT Pulse Code Modulation Synchronous data output PCM output 31 SPI_MOSI Serial Peripheral Interface data input CMOS input 32 SPI_MISO Serial Peripheral Interface data output CMOS output 33 SPI_CSB Chip select for Synchronous Serial Interface CMOS input 34 SPI_CLK Serial Peripheral Interface data clock CMOS input 35 PIO_7 Programmable input/output line Bi-directional 36 PIO_6 Programmable input/output line Bi-directional 37 PIO_5 Programmable input/output line Bi-directional 38 PIO_4 Programmable input/output line Bi-directional 39 RF_IN Connect to Antenna(for RF Signal) Analogue 40 GND Common Ground VSS 41 GND Common Ground VSS 42 GND Common Ground VSS 43 AIO_3 Programmable input/output line Bi-directional 44 GND Common Ground VSS 45 GND Common Ground VSS 46 GND Common Ground VSS 47 GND Common Ground 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 SPDIF Interface I2S Interface PCM_OUT SPDIF_OUT SD_OUT PCM_IN SPDIF_IN SD_IN PCM_SYNC WS PCM_CLK 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 업체 제공용 회로도.sch-1 - Tue Oct 02 18:23:48 2007