Stereo headset mode User`s Guide Rev 1.0 LM556
Contents
1. CLM TTT INNOVATIVE TECHNOLOGY PRODUCTS LM556 Development Board Stereo headset mode User s Guide Rev 1 0 1 Overview The LM740 is CSR BlueCore 5 MM based Bluetooth module and is suitable for A2DP SPP DUN OPP FTP PBAP and HID applications It also allows to implement advanced functions such as noise cancellation and multi media streaming The LM740 module board is de signed for using with the LM556 Bluetooth module Evaluation Kit This user s guide will introduce the settings of LM556 with LM740 module board to implement wireless stereo headset application A2DP Streaming LM740 Running A2DP AVRCP profiles 2 The Settings LM740 Stereo Loud speakers Device name LM740 RX HIC Profiles A2DP Sink AVRCP HFP HSP Pin code 0000 Image file LM740 RX HIC zip Description These settings enable the LM556 with LM740 module board to receive A2DP streaming from music audio source as well as answering phone call with HFP HSP That is to implement the wireless stereo headset application When receiving or making a call the music playback will be automatically paused The music playback can be resumes when the call is ended Each time the LM740 RX HIC is switched on it will intend to connect to the Bluetooth device that the last it had connected with The LM740 RX HIC has battery low detection and protection When battery low occurred it will worn by flashing red LED If the battery is exhausted the firmware wi2. UDIO_IN_P_RIGHT F MiC BIAS 000072 222 n PIO S mz a O can Ono Z USB DN PIO3 AGND 43 VDD CHG gt AGND x E Manai USB_DP o HS e AlO1 lt STTS MIC_A_N USB_D VDD BAT VBAT AIO 20N N AA O y D AIOO S a 4 MICA P C45 C46 PIO10 es E bap eee USB_DN mv wa MIC_B_N 10uF 0805 0 1uF PIO10 LEDO PIO USB_DN B UART_RX S 9 SPI MOSI USB_DP 3 MIC B P UART TX bec SPLMOSI Pag SPI MISO PIO POWER 19 USB_DP MIC_BIAS 4 UART_TXD SPI_MISO VDD_USB SB VDD O SPI_CLK a VARL RX 22 UART_RX 0 VRES EN E PIO O S Pr CSP ART TX 49 DGND DGND Ploi2 EE lt _DGND UART_RTS E 1V8 1V8 2 gt 5 EMBAR UART_CTS of S PIO10 c B70 3 DGND PIO9 Lo 023 ArDD A PIO11 NC PIO12 E 5 8 220M SS SJ O A O O JJ gt 2 E UN ON 0552 DGND S zie 002 ale bles 225555 SN 1v8 ELL kolo k ESO DGND ass G 29219 2 STE N HSSE al El E E 10uF 0805 DGND PIO POWER 10 LM Technologies ee Document Number MS SP LM556 rev1 B Date Sunday October 23 2011 Sheet
3. e the audio outputs L amp R channels of LM740 to headphone amplifier and then output to J1 phone jack Select 3 3V for power supply to LM740 module board Select active low Reset for LM740 module board Select 3 3V for the signal level of PlOs of LM740 module board JP29 Short circuit Seelect 3 3V for headphone power supply Short circuit to pin2 amp pin3 JP30 Enable the self sustain powering scheme Enable 3 3V power supply to the driver ICs of printer port SPI and serial port 2 amon E will set the module board to Pairing mode LM740 RX HIC version Rewind PIO7 Rewind the music playback A2DP of the audio source by AVRCP Fast Forward PIO8 Fast Forward the music playback A2DP of the audio source by AVRCP Volume Up PIO11 Turn volume up of the audio source Volume Down PIO12 Turn volume down of the audio source System Power Switch System Power Switch that allows the operation of On Off Pairing Control ANT9 Antenna VY L10 1 5nH U2 Module Board 25 C24 TP6 DGND D SPKR_A P AUDIO_OUT_P_LEFT 2 m YU VREG EN E a c 0 hens 0 SI AGND ie G 52 SPKRBP H DGND AUDIO_OUT_P_RIGHT aun aaun akol le Tellal S dand DGND DGND AUDIO_OUT_N_RIGHT OJO Ole lt I lar 5 o MIC AN all lu a CA DGND AUDIO_IN_N_LEFT AIOO S 49 MICAP DS poe pret PTET as a U22 ALO AGND LAER AGND abcde aie v PIOO AUDIO_IN_N_RIGHT H MiC E P TITI Sie P0 A
4. ll switch off the system to protect the Li ion battery LM556 Blue LED LED1 amp Red LED LEDO Indicators Sandoy O system is standby but not connected to any Bluetooth device yet Blue LED repeat cycles 2 seconds on 1 second off Pairing mode Flashing Blue and red LEDs alternatively Try to connect with paired Bluetooth device Blue LED is flashing rapidly in blue Both A2DP and HFP are r lashing Blue LED twice by every 2 sec connected Bluetooth r System Power On Off Pairing off switch Connecting state p Line Out Jack Control g ba ja L LLTO JP31 2 Kb JP30 JP29 o J15 L sine JP28 Module Board L amp L i _eedeaeensenes ED Blue amp Red LED 1 0 x q mo nee __ Battery JP6 JE oa Pads JP27 o E O Reset Mini USB S HE JP3z Battery Charger ER Button ac JPA E a E GE Printer Port Port LM556 Jumper Settings Jo 103 Smm phone jack for audio output Battery charger settings Please refer to the LM556 Evaluation Kit General Guide for details Warning To use the internal charger of LM740 the Li ion re chargeable battery shall be installed permanently Set the voltage level of SPI interface to LM740 module board AAN These will wire the MIC1 to the audio input of LM740 Short circuit Select 3 3V for system power JP20 JP22 JP25 Short guii ke pint amp pine to each of these jumpers l JP26 These will wir
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