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Bluetooth Audio Module

Ehong Technology Co., Ltd

7. EH-MB18 Reference Design

Figure 16: Reference Design

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Summary of Contents for EH-MB18

Page 1: ...rmware upgrade over USB With SPP service active 560kbps transmission speed UART PCM interface I2S SPDIF I2C interface Master SPI Audio codec optional support for 64Mb of external SPI flash 16Mb intern...

Page 2: ...rnal CODEC Analogue to Digital Converter 8 4 4 4 Internal CODEC Digital to Analogue Converter 9 5 Pinout and Terminal Description 10 5 1 Pin assignment 10 6 Physical Interfaces 13 6 1 Power Supply 13...

Page 3: ...AUDIO INTERFACE MASTER TIMING 21 TABLE 14 USB INTERFACE COMPONENT VALUES 25 3 Table of Figures FIGURE 1 PINOUT OF EH MB18 10 FIGURE 2 POWER SUPPLY PCB DESIGN 13 FIGURE 3 CONNECTION TO HOST DEVICE 15...

Page 4: ...and Android must be install the APP EHong iOS system APP download address https itunes apple com cn app ehong link id854886208 mt 8 The module has 14 x general purpose IOs 2x Analogue inputs outputs t...

Page 5: ...ed Operating Conditions Note a Maximum charging current 200mA 4 2 Absolute Maximum Rating Table 2 Absolute Maximum Rating Recommended Operating Conditions 4 3 Power consumptions DUT Role Connection Pa...

Page 6: ...o codec HV3 9 8 mA Master eSCO Setting S3 sniff 100ms PCM 2EV3 5 8 mA Master eSCO Setting S3 sniff 100ms PCM 3EV3 5 4 mA Master eSCO Setting S3 sniff 100ms mono audio codec 2EV3 7 9 mA Master eSCO Set...

Page 7: ...ence when SCO eSCO channel is open LEDs disconnected AFH off 4 4 Input output Terminal Characteristics 4 4 1 Digital Terminals Digital Terminals Min Type Max Unit Input Voltage VIL input logic level l...

Page 8: ...VSS_DIG VIN VDD_USB a 1 1 5 A CI input capacitance 2 5 10 pF Output Voltage Levels to Correctly Terminated USB Cable VOL output logic level low 0 0 2 V VOH output logic level high 2 80 VDD_USB V Table...

Page 9: ...ue setting 3dB to 12dB in 3dB steps 3 42 dB Stereo separation crosstalk 89 dB Table 6 Analogue to Digital Converter 4 4 4 Internal CODEC Digital to Analogue Converter Digital to Analogue Converter Par...

Page 10: ...EH MB18 Pin Symbol I O Type Description 1 GND Ground Ground 2 AIO0 Bi directional Analogue programmable input output line 3 AIO1 Bi directional Analogue programmable input output line 4 CAP_SENSE0 An...

Page 11: ...internal 1 5K pull up resistor 18 USB_D Bi directional USB data minus 19 PIO0 Bi directional with programmable strength internal pull up down Programmable input output line 20 SPI_CSB Input with weak...

Page 12: ...ong internal pull down SPI flash clock 38 QSPI_FLASH_IO0 Bi directional with strong internal pull down Serial quad I O flash data bit 0 39 QSPI_FLASH_IO2 Bi directional with strong internal pull down...

Page 13: ...B Design 6 2 Reset The module may be reset from several sources RESETB pin power on reset a UART break character or via software configured watchdog timer The RESETB pin is an active low RESETB and is...

Page 14: ...ed through software to have either weak or strong pull ups or pull downs Note All PIO lines are configured as inputs with weak pull downs at reset Any of the PIO lines can be configured as interrupt r...

Page 15: ...can be used to form a master I2 C interface The interface is formed using software to drive these lines It is suited only to relatively slow functions such as driving a LCD keyboard scanner or EEPROM...

Page 16: ...ction with I 2 C Interface 6 8 Apple iOS CP reference design The figures below give an indicative overview of what the hardware concept looks like A specific MFI co processor layout is available for l...

Page 17: ...d outputs 6 digital MEMS microphone inputs A configurable PCM I S or SPDIF interface Figure 2 outlines the functional blocks of the interface The codec supports stereo playback and recording of audio...

Page 18: ...l and programmed for either microphone or line input It has an analogue and digital programmable gain stage for optimization of different microphones The audio output circuitry consists of a dual diff...

Page 19: ...and law CODEC Motorola MC145481 8 bit A law and law CODEC Motorola MC145483 13 bit linear CODEC STW 5093 and 5094 14 bit linear CODECs 8 EH MB18 is also compatible with the Motorola SSI interface 6 9...

Page 20: ...mbol Parameter Min Typical Max Unit SCK Frequency 6 2 MHz WS Frequency 96 kHz tch SCK high time 80 ns tcl SCK low time 80 ns topd SCK to SD_OUT delay 20 ns tssu WS to SCK set up time 20 ns tsh WS to S...

Page 21: ...rface Slave Timing Symbol Parameter Min Typical Max Unit SCK Frequency 6 2 MHz WS Frequency 96 kHz topd SCK to SD_OUT delay 20 ns tspd SCK to WS delay 20 ns tisu SD_IN to SCK set up time 20 ns tih SD_...

Page 22: ...2 industry standards AES EBU Sony and Philips interface specification SPDIF The interface is compatible with IEC 60958 1 IEC 60958 3 and IEC 60958 4 The SPDIF interface signals are SPDIF_IN and SPDIF_...

Page 23: ...tor on its output The microphone bias generators maintains regulation within the limits 70 A to 2 8mA supporting a 2mA source typically required by 2 electret condensor microphones If the microphone s...

Page 24: ...s AB amplifier The output is available as a differential signal between SPKR_A_N and SPKR_L_P for the right channel as Figure 6 shows and between SPKL_B_N and SPKL_B_P for the left channel Figure 14 S...

Page 25: ...device Figure 15 USB Connections Identifier Value Function Rs 27 Nominal Impedance matching to USB cable Table 14 USB Interface Component Values Note USB_ON is only used when the firmware need an inp...

Page 26: ...Bluetooth Audio Module Ehong Technology Co Ltd 7 EH MB18 Reference Design Figure 16 Reference Design...

Page 27: ...Bluetooth Audio Module Ehong Technology Co Ltd 8 Mechanical and PCB Footprint Characteristics Figure 17 Recommended PCB Mounting Pattern Unit mm Deviation 0 02mm TOP View...

Page 28: ...s EH MB18 RF design to ensure enough clearance area of antenna area length is 1 6 times of antenna length area width is 4 times of antenna width the bigger the better if the space allows Module antenn...

Page 29: ...liquefaction of flux each activator and rosin get activated and start eliminating oxide film formed on the surface of each solder particle and PCB board The temperature is recommended to be 150 to 210...

Page 30: ...echnology Co Ltd 11 Contact Information Sales sales ehlink com cn Technical support support ehlink com cn Phone 86 21 64769993 Fax 86 21 64765833 Street address Rom1505 Blk 1st No 833 South Hong mei R...

Page 31: ...and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help This device com...

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