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SIMCOM WCDMA Wireless Module SIM5360 Audio Application Note

SIMCOM WCDMA Wireless Module · SIM5360 Audio Application Note 1 Introduction SIM5360 provides some AT commands for audio tuning. This document describes how to design and tune the

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Page 1: SIMCOM WCDMA Wireless Module · SIM5360 Audio Application Note 1 Introduction SIM5360 provides some AT commands for audio tuning. This document describes how to design and tune the

SIMCOM WCDMA Wireless Module SIM5360 Audio Application Note

Page 2: SIMCOM WCDMA Wireless Module · SIM5360 Audio Application Note 1 Introduction SIM5360 provides some AT commands for audio tuning. This document describes how to design and tune the

Document Title: SIM5360 Audio Application Note

Version: 1.01

Date: 2014-06-20

Status: Release

Document Control ID: AN SIM5360 Audio Application Note_V1.01

General Notes SIMCom offers this information as a service to its customers, to support application and engineering efforts that use the products designed by SIMCom. The information provided is based upon requirements specifically provided to SIMCom by the customers. SIMCom has not undertaken any independent search for additional relevant information, including any information that may be in the customer’s possession. Furthermore, system validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer’s system integrator. All specifications supplied herein are subject to change. Copyright This document contains proprietary technical information which is the property of SIMCom Limited., copying of this document and giving it to others and the using or communication of the contents thereof, are forbidden without express authority. Offenders are liable to the payment of damages. All rights reserved in the event of grant of a patent or the registration of a utility model or design. All specification supplied herein are subject to change without notice at any time. Copyright © Shanghai SIMCom Wireless Solutions Ltd. 2014

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Contents

Contents ...............................................................................................................................................3 Version history.....................................................................................................................................5 1 Introduction.......................................................................................................................................6 2 Scope of the document......................................................................................................................6 3. Audio Application ............................................................................................................................6

3.1 PCM interface .........................................................................................................................6 3.2 Block diagram of codec...........................................................................................................7 3.3 External Audio Codec Application..........................................................................................8 3.4 Audio channel overview..........................................................................................................8

4 Hardware Design...............................................................................................................................9 4.1 Speaker interface configuration ..............................................................................................9 4.2 Receiver interface configuration .............................................................................................9 4.3 Microphone interfaces configuration ....................................................................................10 4.4 External MIC bias circuit configuration ................................................................................10 4.5 Referenced electronic characteristic......................................................................................11

5 Audio Tuning ..................................................................................................................................11 5.1 MIC volume and frequency response....................................................................................13

5.1.1 AT+CTXFTR Set TX filter.......................................................................................13 5.1.2 AT+CTXVOL Set TX volume..................................................................................13

5.2 Receiver or Speaker volume and frequency response...........................................................14 5.2.1 AT+CRXFTR Set RX filter ......................................................................................15 5.2.2 AT+CVLVL Set value of sound level .......................................................................15 5.2.3 AT+CLVL Loudspeaker volume level ......................................................................16 5.2.4 AT+CRXVOL Set RX volume .................................................................................17

5.3 AT+SIDET Digital attenuation of sidetone ........................................................................18 5.4 Echo canceller .......................................................................................................................19 5.5 TDD noise .............................................................................................................................19 5.6 Sending and receiving distortion...........................................................................................19 5.7 DTMF distortion ...................................................................................................................20

6 Layout guide ...................................................................................................................................20 7 Appendix .........................................................................................................................................21

I. SIM5360 external audio code schematic ...........................................................................21

 

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Figure Index

FIGURE 1: BLOCK DIAGRAM................................................................................................................7 FIGURE 2: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC.........................8 FIGURE 3: SPEAKER INTERFACE CONFIGURATION ........................................................................9 FIGURE 4: RECEIVER INTERFACE CONFIGURATION ......................................................................9 FIGURE 5: MICROPHONE INTERFACE CONFIGURATION .............................................................10 FIGURE 6: EXTERNAL MIC BIAS CIRCUIT CONFIGURATION ......................................................10 FIGURE 7: AUDIO PROGRAMMING MODEL.....................................................................................12

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Version history

Date Version Description of change Author

2014-06-20 1.01 Origin Libing

Page 6: SIMCOM WCDMA Wireless Module · SIM5360 Audio Application Note 1 Introduction SIM5360 provides some AT commands for audio tuning. This document describes how to design and tune the

SIM5360 Audio Application Note

1 Introduction

SIM5360 provides some AT commands for audio tuning. This document describes how to design and tune the audio part for best performance of SIMCOM WCDMA wireless module. (SIM5360 represents the series which is stated below.)

2 Scope of the document

This document is intended for the following versions of the SIMCom modules •SIM5360

3. Audio Application

3.1 PCM interface

Table 1: PCM mode

PCM mode SYNC CLK MODE Format Slot

Auxiliary 8KHz 128KHz Master Only slot 0

Primary 8KHz 2.048MHz Slave/Master

A-law(8 bits)

The default PCM interface on power up is the auxiliary PCM interface. Under PCM, the data is output on the rising edge of PCM_CLK and sampled at the falling edge of PCM_CLK. Primary PCM is disabled at power up or when RESET is asserted, but you can use AT command to enable the primary PCM mode. PCM Interface can be operated in Master and Slave mode. When the PCM interface is configured, PCM Tx data will be routed from the external codec Mic through the DSP encode path in the Module. PCM Rx data will be routed through the DSP decode path to the external codec speaker. When using the PCM Interface, the Module can be set either into Master Mode or Slave Mode. In Master Mode, the Module drives the clock and sync signals that are sent out to the external codec via the PCM Interface. When in Slave Mode, the external codec drives the clock and sync signals that are sent to the Module.

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υ-law(8 bits) linear(16 bits)

0~15(Changed by AT command:at+cpcmslot) Default:slot 0

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Configuration Mode can be selected either primary or auxiliary. Primary configuration mode uses 2.048MHz clock and 8kHz short sync clock, and auxiliary configuration mode uses 128kHz clock and 8kHz long sync clock. One important consideration is that Slave mode is only available for use with Primary configuration Mode. PCM formats can also be chosen by AT command.

Note: 1. PCM interface can be control by AT command. For more details please refer to SIM5360_ATC_EN_V1.xx.doc 2. Timing of SIM5360 pcm please refer to SIM5360_Hardware_Design_V1.xx.doc

3.2 Block diagram of codec

The block diagram of the SIM5360 and external audio codec is described in the figure below. .

Figure 1: block diagram

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3.3 External Audio Codec Application

The following figure is the reference design of SIM5360 PCM interface and external codec IC.

Figure 2: Reference Circuit of PCM Application with Audio Codec

3.4 Audio channel overview

The table below shows the audio channels of SIM5360 wireless module.

Table 2: Audio channels

Module Audio Channel Note

Input: LINPUT2, LINPUT1

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Handset: AT+CSDVC =1 Output: HP_L

Input: LINPUT2, LINPUT1 Headset: AT+CSDVC=2 Output: HP_L

Input: LINPUT2, LINPUT1

SIM5360

Handfree: AT+CSDVC=3

Output: SPK_LP,SPK_LN

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4 Hardware Design

4.1 Speaker interface configuration

Figure 3: Speaker interface configuration

Because SPK_LP and SPK_LN are outputs of Class-D audio amplifier, optional EMI filtering is shown at Figure 1; these components (two ferrite beads and two capacitors) can be added to reduce electromagnetic interference. If used, they should be located near the SPK_LP and SPK_LN. Considerable current flows between the audio output pins and the speaker, so wide PCB traces are recommended (~ 20 mils). 8Ohm speaker is suggested. And the SPK_LP and SPK_LN should layout differential, and they should be far away from VBAT, RF signals, clock and other high power or high frequency signals.

4.2 Receiver interface configuration

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Figure 4: Receiver interface configuration

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33p and 10p are suggested to be added beside the 32 Ohm receiver to reduce RF interfere. The width of HP_L line is typical 6 mils to reduce impedance. They should be far away from VBAT, RF signals, clock and other high power or high frequency signals. HP_L and it’s return path lines should be layout pseudo-differential.

4.3 Microphone interfaces configuration

Figure 5: Microphone interface configuration

WM8960 CODEC has integrated internal MIC bais circuit. There is no need to pull the MIC_P and MIC_M up to the external power, because they have been pulled up in the Module. MIC_P and MIC_N should be layout pseudo-differential.

4.4 External MIC bias circuit configuration

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Figure 6: External MIC bias circuit configuration

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External MIC bias circuit is described in the figure above. MIC_P and MIC_N should be layout pseudo-differential.

4.5 Referenced electronic characteristic

Table 3: MIC Input Characteristics

Parameter Min Typ Max Unit Working Voltage 1.80 V Working Current 70 400 uA External Microphone Load Resistance

1.2 2.2 k Ohms

Table 4: Audio Output Characteristics

Parameter Min Typ Max Unit load Resistance 27 32 Ohm Normal Output

(HP_L) Differential Output power 70 mW

Single Ended

load Resistance 12 16 Ohm

Differential load Resistance 27 32 Ohm

Auxiliary Output (HPR,HPL)

Single Ended

Output power 21.6 mW

Table 5: Speaker Output Characteristics

Parameter Min Typ Max Unit Quiescent Current 6.2 mA

Output power(1KHz) 500 mW

5 Audio Tuning

The audio programming model shows how the signal path can be influenced by varying AT command parameters. Parameters <txVol>, <txFilter>, <stGain> ,<rxVol> and <rxFilter> can be adjusted with corresponding AT commands. For more information on the AT commands and parameters please refer to SIMCOM_SIM5360_ATC_EN_V1.xx.doc

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Figure 7: Audio programming model

Main audio parameters can be changed to satisfy users’ requirement. Here primary register parameters and related description are listed. User can adjust them through AT command. For more detail please refers to Audio Application Document.

Table 6: Audio parameter

Parameter Influence to Range Gain range Calculation AT command

txVol Digital gain of input signal after ADC

0, 1...65535

Mute, -84...+12dB

20 * log (txVol/ 16384)

AT+CTXVOL

txFilter Input PCM 13-tap filter parameters, 7 values

0...65535 --- MATLAB calculate

AT+CTXFTR

rxVol

Digital Volume of output signal after speech decoder, before summation of sidetone and DAC

-300…300 dbm -300…300dbm

AT+CLVL AT+CVLVL AT+CRXVOL

stGain Digital attenuation of sidetone

0, 1...65535Mute, -96...0dB

20 * log (stGain/ 16384) -12

AT+SIDET

rxFilter Output PCM 13-tap filter parameters, 7 values

0...65535 --- MATLAB calculate

AT+CRXFTR

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5.1 MIC volume and frequency response

In figure7, one can turn adjust codec part or DSP part parameters to get desired MIC volume or frequency response. DSP part <txFilt>: AT+ctxftr (Detail description refer to table 7) <txVol>: AT+ctxvol (Detail description refer to table 8) Note: From figure7, user can see that AT+ctxftr, AT+ctxvol can influence sidetone.

5.1.1 AT+CTXFTR Set TX filter

Description This command is used to set audio path parameter – TX filter, and refer to related hardware design document to get more information.

SIM PIN References

NO Vendor

Syntax

Test Command Responses

AT+CTXFTR=? +CTXFTR: (list of supported <tx_ftr_N>s)

OK

Read Command Responses

AT+CTXFTR? +CTXFTR: <tx_ftr_1>,<…>,<tx_ftr_7>

OK

Write Command Responses

AT+CTXFTR=

<tx_ftr_1>,<…>,<tx_ftr_7>

OK

Defined values

<tx_ftr_N>

TX filter level which is from 0 to 65535. (N is from 1 to 7)

Examples

AT+CTXFTR=1111,2222,3333,4444,5555,6666,7777

OK

5.1.2 AT+CTXVOL Set TX volume

Description

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This command is used to set audio path parameter – TX volume, and refer to related hardware design document to get more information.

SIM PIN References

NO Vendor

Syntax

Test Command Responses

AT+CTXVOL=? +CTXVOL: (list of supported <tx_vol>s)

OK

Read Command Responses

AT+CTXVOL? +CTXVOL: <tx_vol>

OK

Write Command Responses

AT+CTXVOL=<tx_vol> OK

Defined values

<tx_vol>

TX volume level which is from 0 to 65535.

Examples

AT+CTXVOL=1234

OK

5.2 Receiver or Speaker volume and frequency response

In figure7, one can only turn adjust DSP part parameters to get desired receiver or speaker volume and frequency response. The parameter of codec part of module can not be adjusted. DSP part <rxFilt>: AT+crxftr (Detail description refer to table 9 ) <rxVol>: AT+cvlvl, (Detail description refer to table 10)

AT+clvl, (Detail description refer to table 11) AT+crxvol (Detail description refer to table 12)

AT+crxvol is used for fine tuning for <rxVol>. AT+CLVL and AT+CVLVL are used for coarse tuning for <rxVol>. Although we provide some AT for adjust the volume such as CRXVOL. These commands can change the voice levels together, that is to say, all the levels are promoted by these two parameters. But if you want to change each sound level value, you should use command CVLVL. AT+CVLVL This command changes the sound level values of the command CLVL. Now we provide 8 levels for each audio channel. The level 0 is muted and it can not be changed by CVLVL. Levels 1 to 7 are supported to change the value of sound level. CVLVL command could let you

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change these four levels. The bigger the number presents the louder the voice. And the range of each level is -5000 to 5000.

5.2.1 AT+CRXFTR Set RX filter

Description This command is used to set audio path parameter – RX filter, and refer to related hardware design document to get more information.

SIM PIN References

NO Vendor

Syntax

Test Command Responses

AT+CRXFTR=? +CRXFTR: (list of supported <rx_ftr_N>s)

OK

Read Command Responses

AT+CRXFTR? +CRXFTR: <rx_ftr_1>,<…>,<rx_ftr_7>

OK

Write Command Responses

AT+CRXFTR=

<rx_ftr_1>,<…>,<rx_ftr_7>

OK

Defined values

<rx_ftr_N>

RX filter level which is from 0 to 65535. (N is from 1 to 7)

Examples

AT+CRXFTR=1111,2222,3333,4444,5555,6666,7777

OK

5.2.2 AT+CVLVL Set value of sound level

Description This command is used to set audio path parameter – RX volume. This command is different from CRXVOL (command CRXVOL will modify the values of all sound levels offset we provided together). You can change the value of each sound level based on your design separately through this command. Please refer to related hardware design document for more information.

SIM PIN References

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NO Vendor

Syntax

Test Command Responses

AT+CVLVL=? +CVLVL: (list of supported <lvl>s),(list of supported <lvl_v-alue>s)

OK

Read Command Responses

AT+CVLVL? +CVLVL: <lvl_value1>,<lvl_value2>,<lvl_value3>,<lvl_value4> ,

<lvl_value5>,<lvl_value6>,<lvl_value7>,<lvl_value8>

OK

Write Command Responses

+CVLVL: lvl_value

OK

AT+CVLVL=<lvl>,<lvl_value>

ERROR

Defined values

<lvl>

Sound level number which is from 1 to 8. <lvl_value>

Sound level value which is from -5000 to 5000. <lvl_value1>

Sound level value that sound level number equals 1. <lvl_value2>

Sound level value that sound level number equals 2. <lvl_value3>

Sound level value that sound level number equals 3. <lvl_value4>

Sound level value that sound level number equals 4. <lvl_value5>

Sound level value that sound level number equals 5. <lvl_value6>

Sound level value that sound level number equals 6. <lvl_value7>

Sound level value that sound level number equals 7. <lvl_value8>

Sound level value that sound level number equals 8.

5.2.3 AT+CLVL Loudspeaker volume level

Description

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Write command is used to select the volume of the internal loudspeaker audio output of the device.

Test command returns supported values as compound value.

SIM PIN References

NO 3GPP TS 27.007

Syntax

Test Command Responses

AT+CLVL=? +CLVL: (list of supported <level>s)

OK

Read Command Responses

AT+CLVL? +CLVL: <level>

OK

Write Command Responses

OK AT+CLVL=<level>

ERROR

Defined values

<level>

Integer type value which represents loudspeaker volume level. The range is from 0 to 7, and 0 represents the lowest

loudspeaker volume level, 2 is default factory value.

NOTE: <level> is nonvolatile, and it is stored when restart.

Examples

AT+CLVL?

+CLVL:2

OK

AT+CLVL=3

OK

5.2.4 AT+CRXVOL Set RX volume

Description This command is used to set audio path parameter – RX volume, and refer to related hardware design document to get more information.

SIM PIN References

NO Vendor

Syntax

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Test Command Responses

AT+CRXVOL=? +CRXVOL: (list of supported <rx_vol>s)

OK

Read Command Responses

AT+CRXVOL? +CRXVOL: <rx_vol>

OK

Write Command Responses

AT+CRXVOL=<rx_vol> OK

Defined values

<rx_vol>

RX volume level which is from -100 to 100.

Examples

AT+CRXVOL=12

OK

5.3 AT+SIDET Digital attenuation of sidetone

Description The command is used to set digital attenuation of sidetone. For more detailed information, please refer to relevant

HD document.

SIM PIN References

NO Vendor

Syntax

Test Command Responses

AT+SIDET=? +SIDET: (list of supported <st>s)

OK

Read Command Responses

AT+SIDET? +SIDET:<st>

OK

Write Command Responses

OK AT+SIDET= <st>

ERROR

Defined values

<st>

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Digital attenuation of sidetone, integer type in decimal format and nonvolatile. Range: from 0 to 65535.

Factory value: HANDSET:2034, HEADSET:1024, SPEAKER PHONE: 0.

Examples

AT+CSDVC=1

OK

AT+SIDET?

+SIDET: 2304

OK

5.4 Echo canceller

SIM5360 has AT command“AT+ CECM” to adjust echo canceller. This AT command is used to select the echo cancellation mode. Each audio channel has it’s own default echo cancellation mode. at+cecm=0 : disable EC mode at+cecm=1 : EC mode recommended for Handset at+cecm=2 : EC mode recommended for Headset at+cecm=3 : EC mode recommended for HANDSFREE at+cecm=4 : EC mode recommended for SPEAKER at+cecm=5 : EC mode recommended for BT HEADSET at+cecm=6,EC mode recommended for Speaker phone aggressive echo arithmetic at+cecm=7,EC mode recommended for Speaker phone medium echo arithmetic at+cecm=8,EC mode recommended for Speaker least aggressive echo arithmetic

5.5 TDD noise

Making sure the module connect to ground well can help to reduce the TDD noise and improve ESD. Filtering capacitors and beads are suggested to be added in the audio lines, 33p and 10p can help reduce the 850Mhz/900Mhz and 1800Mhz/1900Mhz RF interfere. If it is signal, the filtering capacitors and beads are suggested to add beside the module pins. If it is output trace, the filtering capacitors and beads are suggested to add beside the handset/ headset/speaker connector.

5.6 Sending and receiving distortion

There are many factors which may influence the sending and receiving distortion. 1. Unsuitable FIR parameters. They can be adjust by AT+CTXFTR, AT+CRXFTR. 2. Too large TDD noise. 3. Unsuitable AGC parameters.

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5.7 DTMF distortion

Too large sending and receiving gain may result in DTMF distortion. If one find DTMF sending distortion which can be measured by the oscillograph in receiving end, one can decrease the codec gain and try again. Other sending parameters can also be adjusted to get better DTMF performance. If one find DTMF receiving distortion, on can adjust receiving parameters to get better DTMF performance.

6 Layout guide

The audio signals are sensitive to RF signals and power sources (for example Vbat). Please make sure that the audio signals are far away from the RF signals and Vbat. And the output signals and input signals should be kept away from each other by ground. The differential lines should be layout together. And HPL and HPR are not differential signals, so they should be layout separately. Filtering capacitors and beads are suggested to be added in the audio lines, 33p and 10p can help reduce the 850Mhz/900Mhz and 1800Mhz/1900Mhz RF interfere. If it is signal, the filtering capacitors and beads are suggested to add beside the module pins. If it is output trace, the filtering capacitors and beads are suggested to add beside the handset/ headset/speaker connector. One can send design to us for checking.

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7 Appendix

I. SIM5360 external audio code schematic

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100M

C502

100N

F

C503

4.7

UF

C504

100N

F

C505

4.7UF

C500

100N

F

C501

4.7

UF

L501

1.2

K@

100M

C511

4.7

UF

C512

4.7

UF

+

C513

100U

F

L509

1.2

K@

100M

L507

1.2

K@

100M

1

VC

ON

T

2

GN

D

3

OU

T

4

VD

D

U502

8W

26000011

R517

10

KR

C543

100N

F

C509

1uF

C506

1uF

C507

1uF

C551

100NF

C552

4.7UF

L508

6.8

ohm

R512

0R

R513

0R

MIC

_P

EA

R_P

MIC

_N

SPK_N

TPSPK_P

TPSPK_N

SPK_P

PC

M_SY

NC

PC

M_D

IN

PC

M_D

OU

T

PC

M_C

LK

PC

M_S

YN

C_1

V8

PC

M_D

IN_1

V8

PC

M_D

OU

T_1

V8

PC

M_C

LK

_1V

8

IIC

_SC

L_C

OD

EC

IIC

_SD

A_C

OD

EC

IIC

_SC

L

IIC

_SD

A

PC

M_C

LK

_EN

_1V

8

GPIO

42

EA

R_N

GND

GND

GND

N30516

N23004

VBA

T

VC

C_1V

8

PC

M_C

LK_1V

8

PC

M_D

OU

T_1

V8

PC

M_SY

NC

_1V

8

PC

M_D

IN_1V

8

VC

C_1V

8

IIC

_SC

L_C

OD

EC

IIC

_SD

A_C

OD

EC

MC

LK

N12047

MIC

BIA

S

MIC

BIA

S

N30612

MIC

_N

MIC

_P

SPK_P

SPK_N

MIC

BIA

S

MIC

2_N

MIC

2_P

EA

R_P

EA

R_N

VC

C_1V

8

PC

M_C

LK_EN

_1V

8

MC

LK

VD

D_3.0

V

Page 23: SIMCOM WCDMA Wireless Module · SIM5360 Audio Application Note 1 Introduction SIM5360 provides some AT commands for audio tuning. This document describes how to design and tune the

SIM5360 Audio Application Note

AN SIM5360 Audio Application Note 2014.06.20

22

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