Espressif Systems ESP32-LyraTD-SYNA User Manual

ESP32-LyraTD-SYNA

User Guide

Version 1.0 Espressif Systems

About This Guide

This document helps you to get started with the ESP32-LyraTD-SYNA development board.

Release Notes

Documentation Change Notiﬁcation

Espressif provides email notiﬁcations to keep customers updated on changes to technical documentation. Please subscribe at https://www.espressif.com/en/subscribe.

Certiﬁcation

Download certiﬁcates for Espressif products from https://www.espressif.com/en/

certiﬁcates.!

Date

Version

Release notes

2019.09

V1.0

Initial release.

Table of Contents

1. Overview 1 ................................................................................................................................

1.1. ESP32-LyraTD-SYNA! 1".................................................................................................................

1.2. Hardware Resources! 1"..................................................................................................................

2. Conﬁguring for AVS 3 ...............................................................................................................

2.1. Software Preparation! 3".................................................................................................................

2.2. Hardware Preparation! 3"................................................................................................................

2.3. Flashing the Firmware! 4"................................................................................................................

2.3.1. Driver Installation! 4"..........................................................................................................

2.3.2. Flashing ESP32! 4".............................................................................................................

2.4. Network Conﬁguration! 7"...............................................................................................................

2.4.1. Wi-Fi Networking! 7"..........................................................................................................

2.5. Interactive Function! 10"..................................................................................................................

2.5.1. Voice Recognition! 10".......................................................................................................

2.5.2. Buttons! 10".......................................................................................................................

A. Appendix - Schematics 11.......................................................................................................

!

1.Overview

1. Overview

ESP32-LyraTD-SYNA is one of Espressif’s Audio Development Board based on ESP32 MCU and Synaptics DSP. It is an Acoustic Echo Cancelation (AEC) solution, supporting

voice recognition and voice wake-up. Audio ﬁles in the format of WAV, MP3, AAC, FLAC, OPUS and OGG can be decoded and encoded without quality loss. It also supports connection to Amazon’s AVS (Alexa Voice Service), Google's Dialogﬂow and Google's GVA

(Google Voice Assistant).

1.1. ESP32-LyraTD-SYNA

ESP32-LyraTD-SYNA is based on ESP32-WROVER-B, a BT/Wi-Fi combo module, and a digital signal processor (DSP) that features a two-microphone array for noise reduction and echo cancelation, as well as a Coder-Decoder (CODEC) that includes two pairs of DACs &

ADCs with high sampling rates.

!

Figure 1-1. ESP32-LyraTD-SYNA

1.2. Hardware Resources

1. USB Power Port

Provides power supply to the whole system. It is recommended that the system be connected to a power adapter for sufﬁcient current supply.

2. ESP32-WROVER-B module

This is a powerful, general-purpose, Wi-Fi+BT+BLE dual core MCU module, targeting a wide variety of applications ranging from low-power sensor networks to the most demanding tasks, such as voice encoding/decoding, music streaming and runs voice assistant client SDK.

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1.Overview

3. CX20921 DSP

CX20921 is a dual core, far ﬁeld voice input processor which supports Smart Source Pickup(SSP) noise suppression and various functionalities such as voice control, voice

search, Voice over Internet Protocol (VOlP) and acoustic echo cancellation (AEC). This audio DSP is used for wake-word detection. It captures audio data from two external microphones.

4. CX20721 codec

CX20721 is an audio Coder-Decoder which has integrated AudioSmart Class-D with

2.8W per channel.

5. CP2102N USB-UART Chip

An upgraded version of the CP2102 chip supports USB-to-UART conversion.

6. USB Communication Port

This is a normal USB communication port between PC and ESP32 module.

7. ON-Board microphone

There are two types of microphone connection, on-board and by MIC-IN connector.

8. MIC-IN microphone connector

Supports two external microphones.

9. FPC connector

This connection is reserved for connecting external sub board consisting of more devices, such as microphone array, buttons and LEDs etc.

10. Earphone jack

Used for plugging in earphones. Audio output is via codec.

11. Speaker output port

Supports two external speakers output via codec.

12. Button

The six buttons ﬁgure different functions, such as RST, BOOT, PLAY, VOL+/-, MUTE etc.

⚠ Notice:

The IC design of this chip is a little different from CP2102.

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2. Conﬁguring for AVS

2.1. Software Preparation

1. Installing Flash Download Tool

Linux/macOS/Windows users can use the terminal to ﬂash ﬁrmware. For more details, please check ESP-IDF Programming Guide.

Windows users may also use a graphical tool to ﬂash ﬁrmware onto the board using the

Flash Download Tool.

2. Downloading Firmware

Please follow the build instructions of the Alexa SDK from the Github page: https://

github.com/espressif/esp-va-sdk.

3. Debugging Tool

Use serial monitor/console that suits your development environment at baud rate of

115200.

4. App for Provisioning

In order to run Alexa you need to provision LyraTD-SYNA with Alexa credentials and network settings (Wi-Fi SSID and passphrase).

•

Android APK: https://play.google.com/store/apps/details?

id=com.espressif.provbleavs

• iOS: https://apps.apple.com/us/app/esp-alexa/id1464127534

2.2. Hardware Preparation

• 1 x PC (Linux Operating System is recommended).

•

1 x ESP32-LyraTD-SYNA.

• 2 x Micro USB cables (one is for the USB power supply).

• 1 x Speaker or 1 x earphone.

⚠ Notice:

The GitHub repository uses Espressif’s wake-word engine (WWE) for processing the ‘Alexa’ wakeword. This allows easy evaluations. For production use cases, please reach out to

sales@espressif.com or your Synaptics sales representative to obtain an Amazon certiﬁed wake-word

engine.

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2. Conﬁguring for AVS

2.3. Flashing the Firmware

This document captures the process of ﬂashing the ﬁrmware on Windows. Please refer to the ESP-VA-SDK repository on Github for setup on other platforms.

2.3.1. Driver Installation

Connect the board to a PC with a Micro-USB cable and install the USB-to-UART driver.

2.3.2. Flashing ESP32

!

Figure 2-1. Flash Download Tool

• In order to build examples of esp-va-sdk, please follow the instructions mentioned on

the GitHub page.

• Once you build the Alexa ﬁrmware, you will generate three artifacts: bootloader.bin,

partitions.bin and alexa.bin.

• For Flash Download Tool users, follow the instructions given below.

1. Run Flash Download Tool, and click on “ESP32 Download Tool” at the interface.

See Figure 2-1 above.

2. Then you will see the interface shown in Figure 2-2 below.

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2. Conﬁguring for AVS

!

Figure 2-2. ESP32 Download Tool

3. Select the binary ﬁles (mentioned in table below) and set appropriate address in the tool as shown in Figure 2-3.

Binary Files

Address

Function

bootloader.bin

0x1000

basic conﬁguration

partitions.bin

0x8000

basic conﬁguration

alexa.bin

0x10000

audio application

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!

Figure 2-3. Flashing Conﬁguration

4. The SPI Download conﬁguration on the ESP32 Download Tool is shown in Figure 2-3. Select “80 MHz” for “SPI SPEED”; select “DIO” for “SPI MODE”; and select

“128 Mbit” for “FLASH SIZE”.

5. Select the COM port in line with the one used by the PC; select “1152000” as a baud rate.

6. Click the “START” button on the ESP32 Flash Download Tool to start downloading the ﬁrmware.

7. Wait for the download to ﬁnish. See Figure 2-4.

!

Figure 2-4. Downloading Firmware

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2. Conﬁguring for AVS

2.4. Network Conﬁguration

2.4.1. Wi-Fi Networking

1. After successfully downloading the ﬁrmware, power on the board again by pressing the EN button.

2. To conﬁgure the network for the ﬁrst time:

• Turn on the bluetooth in your phone. Open Espressif’s Alexa programming app and

click on Provision New Device. Make sure your phone has internet connectivity.

!

Figure 2-5. Provision New Device

• The provisioning happens over BLE (Bluetooth Low Energy). Android mandates

applications to have Location permission for accessing BLE. Please provide the permission when the pop-up shows up.

•

You will see the list of available devices that needs to be provisioned, namely ESP- Alexa-WXYZ. Select the device that you wish to provision.

📖 Note:

Terminal users can follow the ﬂashing instructions as available on the GitHub page.

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2. Conﬁguring for AVS

!

Figure 2-6. List of available devices

• Next step is to login to your amazon account.

!

Figure 2-7. Login to your amazon

•

After successful login and authorization, you will be shown a list of Wi-Fi networks in the vicinity. Choose the network that you wish the device to connect to. Once

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2. Conﬁguring for AVS

selected, enter the passphrase of that Wi-Fi network and click on the provision button.

!

Figure 2-8. Available Wi-Fi networks

!

Figure 2-9. Enter your passphrase

• On successfully connecting to the Wi-Fi network, after provisioning, the DSP and

Alexa will be initialized, and ready to take voice commands.

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2. Conﬁguring for AVS

2.5. Interactive Function

2.5.1. Voice Recognition

•

Once all initialization are done, the device is ready. You can either use "PLAY" button on the board (Tap-To-Talk) or say "Alexa" to start a conversation. For Tap-to-Talk, press and release the button and speak.

•

You can now ask any command like:

-

Tell me a joke.

-

How is the weather?

-

Will it rain today?

-

Sing a song.

-

Play TuneIn radio.

-

Set volume level to 7.

2.5.2. Buttons

• The “PLAY” button can be used as tap-to-talk. The same button can also be used to

disable an Alarm/Timer.

• The “Vol+” and “Vol-” buttons can be used to adjust the volume of the sound. Press

them repeatedly until you reach the desired sound volume.

• The "Mute" button can be used to mute/unmute the device.

• To reset to factory settings, press "Vol+" and "Vol-" button together for about 10

seconds.

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Appendix A

A. Appendix - Schematics

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4

3

2

1

D D

C C

B B

A A

ESP32

Power Block:

System Block:

DSP

CX20921

Codec

CX22721

MIC*2

Keys

SPK*2

EN Key

RST

BOOT Key

BOOT

USBtoUART

TX/RX

USB

CNN

D+/D-

Key*4

CNN(Reserved

for LED,Key,MIC)

I2C&ADC

MIC

OUT+/-

INT+RST+I2C

+I2S_CX_TX

IRQ+EAPD+I2C

+I2S_ESP_TX

I2S_AEC

VCC

AP7361C-33

-ER-7/13

USB

CNN

ESP32

3.3V

LDO

3.3V

DSP

CX20921

3.3V

Codec

CX22721

LDO

1.8V

VCC

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Appendix A

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5

4

3

2

1

D D

C C

B B

A A

ESP32 Module:

Button Array

USB<->UART:

JTAG

MTDI

MTCK

MTMS

MTDO

UART I2C

I2C:SCL

I2C:SDA

I2S

Automatic & Button Download:

Auto program

DTR RTS--> EN_Auto IO0_IO2_Auto

1 1 1 1

0 0 1 1

1 0 0 1

0 1 1 0

DSP GPIO

DSP_I2S_LRCK : IO32

Codec_SPK_MUTE:IO22

PJ_DET:IO21

Codec_I2S_BCLK:IO5

Codec_I2S_FS:IO25

Codec_I2S_SDI0:IO26

Codec_I2S_MCLK:IO0

Codec_EAPD:IO4

DSP_I2S_DO : IO35

DSP_I2S_BCLK : IO33

DSP RESET : IO19

I2C_SCL:IO23

I2C_SDA:IO18

MUTE_ON_OFF:IO27

USB:

3.3V/800mA

Power Supply for ESP32:

EN

SENSOR_VP

SENSOR_VN_ADC

IO34

IO35

IO32

IO33

IO25

IO26

IO27

IO14

3V3

IO13

DGND

IO22

TXD0

RXD0

IO21

IO19

IO18

IO4

IO0

IO5

IO23

Module_NC

IO15

IO2

DGND

SHD/SD2

SWP/SD3

SCS/CMD SCK/CLK

SDO/SD0

SDI/SD1

IO17_NC

IO16_NC

DGND

IO12

IO13

IO14

IO15

TXD0

RXD0

IO23

IO18

IO35

IO32

IO33

IO0

IO5

IO25

IO26

IO23

IO18

Module_NC

3V3

IO26

IO27

IO34

IO22

DGND

IO12

IO17_NC

IO16_NC

DGND

IO19

IO25

IO2

EN

SENSOR_VP

SENSOR_VN_ADC

IO35

IO32

IO33

IO14

IO23

TXD0

RXD0

IO21

IO18

IO4

IO0

DGND

IO13

SHD/SD2

SWP/SD3

SCS/CMD

SCK/CLK

SDO/SD0

SDI/SD1

IO15

IO5

SENSOR_VN

IO18

IO33

IO32

SENSOR_VP

IO22

IO21

IO5

IO25

IO26

IO0

IO4

IO35

IO19

IO23

IO27

D-

D+

USB_DP

USB_DN

REGIN

TXD

RXD0

USB_DN

RST#

ACTIVE

TXD0

USB_DP

DTR

RTS

IO0_IO2_Auto

IO0_IO2_KEY

IO2

IO0

EN

EN_KEY

EN_Auto

DTR

RTS

EN_Auto

IO0_IO2_Auto

EN

SENSOR_VN SENSOR_VN_ADC

DGND

GND

DGND

VDD33

DGND

VDD33

DGND

GNDGND GND

GND

VUSB

GND

VBUS0

VUSB

GND

VBUS0

GND

VDD33

GND

VDD33

VCC

GNDGND

VUSB

GND

VCC

GNDGND GND

VDD33

GND

VDD33

DGND

VDD33

DGND

SENSOR_VN 3

IO18

3,5,6

IO33 5

IO32 5

CX_GPIO_1 5

IO23 3,5,6

IO226IO21

6

IO5 6

IO256IO266IO0

6

IO4

6

IO35 5

IO19

5

IO27 3,5

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R36

100K(1%)(NC)

R230 0R(5%)

R21 0R(5%)

U4 AP7361C-33-ER-7/13

GND

1

VOUT

2

VIN

3

Tab

4

C16

0.1uF/16V(10%)

TP59

1

J12

USB_CON8

VBUS

1D-2D+3

GND

5NC4

GND6GND7GND8GND

9

TP53

1

C4

10uF/16V(20%)

D37 BAT54C

1

2

3

TP49

1

D3

LESD5D5.0CT1G

C193

0.1uF/16V(10%)

D4

LESD5D5.0CT1G

SW2

SW_R

1

2

3

4

TP58

1

TP50

1

SW1

SW_R

1

2

3

4

R9 0R(5%)

R229

47.5K(5%)

TP64

1

D35 BAT54A

1

2

3

R286 5.76K(1%)

R2

2.2K(1%)

R38 0R(5%)

J2

SK-12D02-VG3

1 2 3

J1

USB_CON8

VBUS

1D-2D+3

GND

5NC4

GND6GND7GND8GND

9

R31 0R(5%)

TP60

1

TP54

1

C10

10uF/16V(20%)

C205

0.1uF/16V(10%)

TP52

1

R22

0R(5%)

C11

0.1uF/16V(10%)

TP57

1

C14

0.1uF/16V(10%)

D36 BAT54C

1

2

3

R3

2.2K(1%)

R29 1K(1%)

D17

GREEN LED

12

TP62

1

C18 0.1uF/16V(10%)(NC)

R1 0R(5%)

R24 0R(5%)

C5

22uF/10V(20%)

C19 0.1uF/16V(10%)(NC)

TP65

1

C3

1uF/16V(10%)

R5

10K(5%)

Q8

L8050QLT1G

R228 22.1K(5%)

D31 SS24(NC)

TP61

1

TP55

1

U5

CP2102N-A02-GQFN28

DCD1RI2GND3D+4D-5VDD6REGIN

7

VBUS

8

RST

9

NC1

10

SUSPEND

11

SUSPEND

12

NC2

13

NC3

14

NC415NC516NC617NC718NC819NC9

20

NC10

21

NC11

22

CTS

23

RTS

24

RXD

25

TXD

26

DSR

27

DTR

28

PGND

29

C2

1uF/16V(10%)

TP48

1

R33

100K(1%)(NC)

D2

LESD5D5.0CT1G

R28 10K(5%)(NC)

R287 10K(5%)

TP56

1

R288 10K(5%)

D1

SS24

TP51

1

R35 0R(5%)

Q9

L8050QLT1G

TP63

1

C1

100uF/6.3V(20%)

C15

10uF/16V(20%)

C12

22uF/10V(20%)

U2

ESP32-WROVER-B

GND113V32EN3SENSOR_VP4SENSOR_VN5IO346IO357IO328IO339IO2510IO2611IO2712IO1413IO1214GND215IO1316SD217SD318CMD

19

CLK20SD021SD1

22

IO15

23

IO224IO025IO4

26

NC127NC2

28

IO5

29

IO1830IO19

31NC32

IO21

33

RXD0

34

TXD0

35

IO2236IO23

37

GND3

38

P_GND

39

C13

10uF/16V(20%)

U1

ESP32-WROOM-32D(NC)

GND113V32EN3SENSOR_VP4SENSOR_VN5IO346IO357IO328IO339IO2510IO2611IO2712IO1413IO12

14

GND3

38

IO2337IO22

36

TXD0

35

RXD0

34

IO21

33NC32

IO1931IO18

30

IO5

29

IO1728IO16

27

IO426IO0

25

GND2

15

IO13

16

SD2

17

SD3

18

CMD

19

CLK

20

SD0

21

SD1

22

IO15

23

IO2

24

P_GND

39

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Appendix A

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4

3

2

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D D

C C

B B

A A

6-Physical-Buttons:

Connector for LED & Button & MIC (Reserved):

0.6V

MIC MUTE

1.8V

2.42V

1.2V

VOL+

PLAY/PAUSE

VOL-

I2C_SCL:IO23

I2C_SDA:IO18

Button Array

MUTE_ON_OFF:IO27

IO18

IO23

SENSOR_VN

CX_MICBIAS1

CX_MICBIAS2

ExtFFC_MIC_INN1

ExtFFC_MIC_INP1

ExtFFC_MIC_INP2

ExtFFC_MIC_INN2

IO27

SENSOR_VN

IO23

IO18

CX_MICBIAS1

CX_MICBIAS2

ExtFFC_MIC_INP1

ExtFFC_MIC_INN1

ExtFFC_MIC_INP2

ExtFFC_MIC_INN2

IO27

CX_GND

LED_VCC

CX_GND

VCC

CX_GND

GND

VDD33

GND

SENSOR_VN 2

IO23 2,5,6

IO18

2,5,6

CX_MICBIAS1 5

CX_MICBIAS2 5

ExtFFC_MIC_INP15ExtFFC_MIC_INN15ExtFFC_MIC_INP25ExtFFC_MIC_INN2

5

IO27 2,5

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R40

2.2K(1%)

C137

0.1uF/16V(10%)

S3

SW_R

1

2

3

4

S4

SW_R

1

2

3

4

D19

LESD5D5.0CT1G

J13

AFC01-S16FCA-00

11223344556677889910101111121213131414151516

16

S1

SW_R

1

2

3

4

S2

SW_R

1

2

3

4

R39

5.76K(1%)

R37

12K(1%)

C17

10nF/50V(10%)

R30

10K(5%)

R276 0R(5%)

R32

27.4K(1%)

C138

10uF/16V(20%)

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Appendix A

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4

3

2

1

D D

C C

B B

A A

Note: Include +1.0V Test Point

as shown in all designs.

Place L16, C149, C150 close to CX20921 device.

Critical Layout Note:

C146 negative terminal and C150 negative terminal connecting to PGND should both be

placed very close to pin 6 of the CX20921 device.

The PGND-GND 50-mil tie connection should be close to the C146/C150/Pin_6 junction.

Doing this will minimize the GND bounce in the DC-DC converter area.

VISHAY:IFSC1515AHER2R2M01.

Note: Include resistor ladder and

capacitor as shown in all designs.

Single ended:45ohm

Differential:90ohm

+5V_USB

USB_DP

USB_DM

GND

TXC:

7A-24.000MAAJ-T

Note: VDDO_1 and VDDO_2 should connect directly to +3.3V or +1.8V

external System power, based on I/O signal level requirements.

VDDO_1 - Input supply which internally powers I2S TX, I2C Slave, SPI Master, and RESET interfaces.

VDDO_2 - Input supply which internally powers I2S RX, GPIOs, UART and DMIC interfaces.

VDDO_3 - Input supply which internally powers the USB interface, must always connect to +3.3V only.

Create PGND plane, separate from

normal GND (Digital Ground) plane for

internal DCDC.

Tie the PGND to Digital Ground planes

together at C146/C150/Pin_6 junction

using 50-mil trace.

DCDC/DIGITAL/MIC GROUNDS

Mic section has its own plane

MGND.

Tie MGND to GND with 50-mils

metal plane on Bottom layer.

Short PGND to DGND directly with a trace.

Short MGND to DGND directly with a trace

Do not use a resistor or ferrite between the grounds.

Power for CX20921

：

From CX20921 datasheet P18.

Power consumption max is 3.3x49mA=161.7mW.

3.3V/400mA

CX_USB_DP

CX_USB_DM

CX_USB_5VDET

CX20921_3V3

CX_PGND CX_GND

CX20921_3V3

CX_PGND

CX20921_3V3

CX_GND

CX20921_1V0

CX_PGND

CX_GND

CX_GND CX_GND

CX20921_1V0CX20921_3V3

CX_GND

CX20921_3V3

CX_GND

CX20921_3V3

CX_GND

CX20921_1V0

CX_GNDCX_GND

CX_MGND

CX_GND

CX20921_3V3

CX_GND CX_MGNDCX_PGND

CX_GND

VCC

CX_GND

CX20921_3V3

CX_GND

CX_GNDDGND

VDD33

Title

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R77

10K(5%)

C164

10nF/50V(10%)

R234 0R(5%)

R180 22.1R(5%)

C161

10nF/50V(10%)

C145

0.1uF/16V(10%)

C165

10uF/16V(20%)

TP21

1

C168

0.1uF/16V(10%)

C154

10nF/50V(10%)

R80

10K(5%)(NC)

C146

10uF/16V(20%)

C162

1uF/25V(10%)

C166

0.1uF/16V(10%)

R181 22.1R(5%)

POWER

U19E

CX20921_60P_ENG

VDD33_ANA38VDD_LDO33ANAOUT43VDD_LDO33IN44VDD_LDO12OUT45EP

61

VDDO_14VDDO_221VDDO_3

28

VDD5VDD9VDD20VDD27VDD50VDD

56

VDDO_1

55

TP22

1

C155

1uF/25V(10%)

C178

10nF/50V(10%)

R176

100K(1%)

C169

0.1uF/16V(10%)

R177 301K(1%)

TP23

1

C179

1uF/25V(10%)

C180

10nF/50V(10%)

C66

4.7uF/10V(20%)

C151

1uF/16V(10%)

C158

10nF/50V(10%)

C170

0.1uF/16V(10%)

TP24

1

C156

0.1uF/16V(10%)

C181

1uF/25V(10%)

C153 22pF/50V(5%)

C159

1uF/25V(10%)

C147

10nF/50V(10%)

C172

1uF/25V(10%)

C157

10uF/16V(20%)

C171

0.1uF/16V(10%)

R263

52.3K(1%)

C148

1uF/25V(10%)

C152 22pF/50V(5%)

C173

10nF/50V(10%)

C160

10nF/50V(10%)

R214

0R(5%)

R182 33R(5%)

R264

30.1K(1%)

TP20

1

XTAL

DCDC

USB

U19D

CX20921_60P_ENG

DCDC_PVSS

6

USB_DP

29

AVDD33

13

PSUP_1V046PSUP_3V349XIN47XOUT

48

USB_DM

30

DCDC_EN

11

DCDC_FB

12

DCDC_IREF

10

DCDC_SW

7

PVDD33

8

USB_5VDET

31

C174

10nF/50V(10%)

C149

0.1uF/16V(10%)

Y3

24MHz

C68

0.1uF/16V(10%)

L16

2.2uH(20%)@3A

R178 80.6K(5%)

C175

1uF/25V(10%)

C150

10uF/16V(20%)

C69

10uF/16V(20%)

C67

10nF/50V(10%)(NC)

R179 130K(5%)

R275 0R(5%)(NC)

C163

1uF/25V(10%)

C167

0.1uF/16V(10%)

U11 RT9043GB@400mA

EN

3

OUT

5

VIN

1

NR/FB

4

GND

2

R183 2.2R(1%)

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Appendix A

! !

5

4

3

2

1

D D

C C

B B

A A

Digital MEMS Option

CX20921 I2S Block:

CX20921 Communication Block:

Note:

For ASR designs, the GPIO to host processor connection is required.

For VoIP designs, the GPIO to host connection is optional.

DSP RESET : IO19

Codec_I2S_MCLK

DSP_I2C_SDA : IO18

DSP_I2C_SCL : IO23

DSP GPIO

DSP_I2S_BCLK : IO33

DSP_I2S_DO : IO35

DSP_I2S_LRCK : IO32

MUTE_ON_OFF:IO27

To MCU;

From MCU;

MIC MUTE LED

CX20921 Mic Block:

Analog Mic Input:

Note:

If the mic from FFC connector is analog MEMS,

R277,R278,R279,R280, should be surface-mounted,

And R53,R52,R67,R69, should be NC.

MIC INPUT

Option1

Option2

AEC_I2S_FS:

AEC_I2S_DATA:

AEC_I2S_BCLK:

CX_TXD

CX_RTS/DMIC_CLK

CX_CTS/DMIC_DAT

CX_RXD

CX_I2C_SDA

CX_GPIO_1

CX_RSTN

CX_I2C_SCL

CX_I2S_TX_DATA

CX_I2C_SCL

CX_TXD

CX_I2S_TX_CLK

CX_I2S_TX_LRCK

CX_GPIO_1

IO27

CX_INPUT_INP1

CX_INPUT_INN1

IO27

CX_ANA_INP1

CX_ANA_INN1

CX_MICBIAS1

CX_INPUT_INP2

CX_INPUT_INN2

IO27

CX_ANA_INP2

CX_ANA_INN2

CX_MICBIAS2

CX_I2S_RX_CLK

CX_I2S_RX_LRCK

CX_I2S_RX_DATA2

CX_I2S_RX_DATA3

CX_I2S_TX_LRCK

CX_I2S_TX_CLK

CX_I2S_TX_DATA

CX_ANA_INP1

CX_ANA_INN1

CX_ANA_INP2

CX_ANA_INN2

CX_MICBIAS1

CX_MICBIAS2

IO27

CX_I2C_SDA

CX_GPIO_1

CX_MICBIAS1

CX_MICBIAS2

ExtFFC_MIC_INP1

ExtFFC_MIC_INN1

ExtFFC_MIC_INP2

ExtFFC_MIC_INN2

ExtFFC_MIC_INP1CX_INPUT_INP1

OnBoard_MIC_INP1

AuxIN_MIC_INP1

CX_INPUT_INN1

OnBoard_MIC_INN1

AuxIN_MIC_INN1

ExtFFC_MIC_INN1

CX_INPUT_INP2

OnBoard_MIC_INP2

AuxIN_MIC_INP2

ExtFFC_MIC_INP2

CX_INPUT_INN2

OnBoard_MIC_INN2

AuxIN_MIC_INN2

ExtFFC_MIC_INN2

OnBoard_MIC_INP2

OnBoard_MIC_INN2

OnBoard_MIC_INP1

OnBoard_MIC_INN1

AuxIN_MIC_INN1

AuxIN_MIC_INP1

AuxIN_MIC_INN2

AuxIN_MIC_INP2

CX20721_BCLK

CX20721_LRCLK

CX20721_ADCDAT

CX20721_BCLK

CX20721_LRCLK

CX_I2S_RX_DATA1CX20721_ADCDAT

CX_GND

CX20921_3V3

CX_GND

CX20921_3V3CX20921_3V3

CX20921_3V3

CX_GND

CX20921_3V3

CX_GND CX_GND

CX20921_3V3

DGND

CX20921_3V3

CX_MGND

CX_MGND CX_MGND

CX_MGND

CX20921_3V3

CX_MGND

CX_MGND CX_MGND

CX_GND

CX_MGND

VDD33

CX20921_3V3

CX_GND

CX_GND CX_GND CX_GND CX_GND

IO19 2

IO18

2,3,6

IO35 2

CX_TXD 6

IO23 2,3,6

IO332IO32

2

CX_GPIO_1 2

IO27 2,3

CX_MICBIAS13CX_MICBIAS2

3

ExtFFC_MIC_INP13ExtFFC_MIC_INN13ExtFFC_MIC_INP23ExtFFC_MIC_INN2

3

CX20721_BCLK6CX20721_LRCLK6CX20721_ADCDAT

6

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I2S

U19A

CX20921_60P_ENG

I2S_TX_CLK3I2S_TX_DATA_11I2S_TX_LRCK2I2S_RX_CLK22I2S_RX_DATA_123I2S_RX_LRCK

24

I2S_RX_DATA_225I2S_RX_DATA_3

26

TP77

1

R69 1.1K(5%)

R201

10K(5%)

J16

CON3x1_2P54

123

D29

LESD8D3.3CAT5G(NC)

TP34

1

TP26

1

R300 0R(5%)

R53 1.1K(5%)

J4

CON2

112

2

C185

10nF/50V(10%)

D30

LESD8D3.3CAT5G(NC)

L17

39nH(±2%)

J17

CON3x1_2P54

123

L19

39nH(±2%)

TP27

1

U20

W25Q32FVSSIG

/CS

1

DO

2

/WP

3

GND

4

DI

5

CLK6/HOLD

7

VCC

8

R206 33R(5%)

C186

10nF/50V(10%)

D32

LESD8D3.3CAT5G(NC)

R279 0R(5%)(NC)

R191 10K(5%)

R184 0R(5%)

TP28

1

R282 10K(5%)

R197 1.8K(5%)(NC)

C190

10pF/50V(5%)(NC)

R204 0R(5%)

R194

10K(5%)(NC)

R203 0R(5%)

D33

LESD8D3.3CAT5G(NC)

L20

39nH(±2%)

R299 0R(5%)

R284 0R(5%)

C50

10nF/50V(10%)

R207 33R(5%)

C188

10uF/16V(20%)(NC)

L18

39nH(±2%)

R192 33R(5%)

R52 1.1K(5%)

R185 0R(5%)

R86 0R(5%)

J14

CON3x1_2P54

123

D18

RED LED

R209 0R(5%)

C189

10uF/16V(20%)(NC)

C52 10nF/50V(10%)

TP29

1

C53

10pF/50V(5%)

Audio Port

U19B

CX20921_60P_ENG

ANA_INP140MICBIAS232MICBIAS141ANA_INN139ANA_INP233ANA_INN2

34

VREFN

36

VREFP

35

VREF

42

VSS_REF

37

C34 10nF/50V(10%)

Q7

LBSS138LT1G

TP30

1

R297

5.76K(1%)

R278 0R(5%)(NC)

C51 470pF/50V(10%)

R198 1.8K(5%)(NC)

R186 0R(5%)

C36 10nF/50V(10%)

R205 0R(5%)

TP31

1

C32

10pF/50V(5%)

R277 0R(5%)(NC)

R208 0R(5%)

Q11

LBSS138LT1G

R212 49.9R(1%)

R199 0R(5%)

C54

33pF/50V(±2pF)

C184

1uF/25V(10%)

TP32

1

R193

10K(5%)(NC)

R195 0R(5%)

C191 470pF/50V(10%)

C33

33pF/50V(±2pF)

R187 0R(5%)

U23

TS3A4742 DCN

IN11IN26COM17COM2

4

VCC2GND

5

NC23NC1

8

R296 10K(5%)

R213 49.9R(1%)

J15

CON3x1_2P54

123

R200 0R(5%)

R202 100K(1%)

J5

CON2

112

2

C182

0.1uF/16V(10%)

TP25

1

R298 0R(5%)

U22

TS3A4742 DCN

IN11IN26COM17COM2

4

VCC2GND

5

NC23NC1

8

TP38

1

R196 0R(5%)

R188 4.7K(5%)

TP76

1

C48

10pF/50V(5%)

J18

A1251WR-S-4P

1122334

4

C207 0.1uF/16V(10%)

R190 4.7K(5%)

R210 49.9R(1%)

C183

1uF/16V(10%)

I2C Slave

SPI

Master

GPIO

UART

U19C

CX20921_60P_ENG

SPI_MO51SPI_MI

53

S_SDA

58

SPI_CK

52

S_SCL

59

SPI_SS0

54

TEST

57

TXD14RXD15CTS16RTS

17

GPIO_118GPIO_2

19

RSTN

60

C187

1uF/25V(10%)

TP33

1

C37

10pF/50V(5%)

C49

33pF/50V(±2pF)

R189 4.7K(5%)

TP39

1

C206 0.1uF/16V(10%)

R306 5.76K(1%)

C38

33pF/50V(±2pF)

R67 1.1K(5%)

R211 49.9R(1%)

R280 0R(5%)(NC)

D34 GREEN LED

12

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Appendix A

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5

4

3

2

1

D D

C C

B B

A A

SPK:

Phone Jack:

Codec_EAPD:IO4

Codec_I2C_SDA:IO18

Codec_I2C_SCL:IO23

PJ_DET:IO21

Codec_SPK_MUTE:IO22

Codec_I2S_BCLK:IO5

Codec_I2S_FS:IO25

Codec_I2S_SDI0:IO26

Codec_I2S_MCLK:IO0

AEC_I2S_BCLK:

1.When PJ is not plugged in,

PJ_JSENSE is pulled low,

thus music output via speaker.

2.When PJ is plugged in,

PJ_JSENSE is pulled high,

thus music output via PJ.

Codec_I2S_MCLK

Codec:

AEC_I2S_FS:

AEC_I2S_DATA:

Power Supply for Codec:

3.3V/400mA

1.8V/150mA

ROUTP

ROUTN LOUTN

LOUTP

HP_A_R

HP_A_L

IO18

IO4

IO23

IO21

IO22

IO0

IO5

IO25

IO26

PJ_DET

CX_TXD

IO22

CX20721_SPKR_MUTE

CX20721_Jack_Sense_IRQ

CX_TXD

HP_A_L

HP_A_R

HGNDA

HGNDB

PORTD_A_MIC

PORTD_B_MIC

MIC/LINEIN_B_L

MIC/LINEIN_B_R

MICBIAS_B

CX20721_BCLK

CX20721_LRCLK

CX20721_ADCDAT

CX20721_DACDAT

IO0

IO5

IO25

IO26

CX20721_MCLK

IO23

IO18

CX20721_SCL

CX20721_SDA

DMIC1_CLK

DMIC1_DAT

ROUTN

ROUTP

LOUTP

LOUTN

CX20721_BCLK

CX20721_LRCLK

CX20721_ADCDAT

IO4

CX20721_EAPD

IO21

Codec_GND Codec_GND

Codec_AGND

Codec_AGND Codec_AGND

Codec_GND

CX20721_3V3

VDD18

Codec_GND

GND Codec_GND Codec_GND Codec_AGND

Codec_GND

Codec_AGND

Codec_GND

Codec_AGND

Codec_GND

AVDD5

Codec_AGND Codec_AGND

CP_VDD18

Codec_GND Codec_GND

VDD18

Codec_GND Codec_GND

Codec_GND

PVDD5_L/R

Codec_GNDCodec_GNDCodec_GNDCodec_GND

Codec_GND Codec_GND

CX20721_3V3

Codec_GND

CX20721_3V3

Codec_GND

CX20721_3V3

Codec_AGND

Codec_GND Codec_GND

Codec_GND

Codec_VCC

CX20721_1V8 CX20721_1V8

Codec_GND

Codec_VCC

Codec_GND

CX20721_3V3

Codec_GND

Codec_VCC

Codec_GND

CX20721_1V8

Codec_GND Codec_GND

Codec_GND

VCC

Codec_VCC

IO18

2,3,5

IO4

2

IO23 2,3,5

IO21

2

IO22

2

IO0 2

IO52IO252IO26 2

CX_TXD

5

CX20721_BCLK 5

CX20721_LRCLK 5

CX20721_ADCDAT 5

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U13 RT9043GB@400mA

EN

3

OUT

5

VIN

1

NR/FB

4

GND

2

C102 2.2uF/10V(10%)

R104 0R(5%)

PJ-3930-A

J7

1

2

334

4

5566778

8

C98

1000pF/50V(5%)(NC)

C125

390pF/50V(10%)(NC)

R272

10K(5%)

C99

1000pF/50V(5%)(NC)

R239 0R(5%)

C120

0.1uF/16V(10%)

C119

10uF/16V(20%)

C124

330pF/50V(10%)(NC)

C101 1uF/16V(10%)

R90

10K(5%)

R91 0R(5%)

R283

0R(5%)(NC)

D27

LESD8D3.3CAT5G(NC)

R237 0R(5%)

TP42

1

R259

52.3K(1%)

C96

1000pF/50V(5%)(NC)

TP6

1

C97

1000pF/50V(5%)(NC)

R87

0R(5%)

R244 5.1R(5%)

R95 4.7K(5%)(NC)

R98 4.7K(5%)(NC)

R101 47R(1%)

C90

0.1uF/16V(10%)

R115 0R(5%)

C121

0.1uF/16V(10%)

TP45

1

C200

4.7uF/10V(20%)

R108 0R(5%)

R242 0R(5%)

C128

330pF/50V(10%)(NC)

R312

0R(5%)

R106

0R(5%)(NC)

R243 5.1R(5%)

C198

0.1uF/16V(10%)

R309 10K(5%)(NC)

R261

10K(5%)

R241 0R(5%)

C108

4.7uF/10V(20%)

C112

0.1uF/16V(10%)

R92

0R(5%)

C122

330pF/50V(10%)(NC)

C80

22pF/50V(NC)

C115

0.1uF/16V(10%)

R258 0R(5%)

C88

4.7uF/10V(20%)

R111

100K(1%)

R102 47R(1%)

L22 0R(5%)

R311 0R(5%)

C110

4.7uF/10V(20%)

C126 390pF/50V(10%)(NC)

R262

10K(5%)(NC)

C86

22pF/50V(NC)

C100 2.2uF/10V(10%)

C109

0.1uF/16V(10%)

C199

10uF/16V(20%)

R231 0R(5%)

TP43

1

R84 33R(5%)

C123

330pF/50V(10%)(NC)

R238 0R(5%)

L21 0R(5%)

TP41

1

R93

33R(5%)

R232 0R(5%)

R310 10K(5%)

C196

10nF/50V(10%)(NC)

C117

100uF/6.3V(20%)(NC)

R240 0R(5%)

R114

10K(5%)(NC)

TP46

1

R85 33R(5%)

C79 0.1uF/16V(10%)

C103 2.2uF/10V(10%)

R260

30.1K(1%)

J9

A2001WR-S-2P

R290

0R(5%)

R113

10K(5%)

U21

TPS71718DCKR

EN

3

OUT

5

VIN

1

NR/FB

4

GND

2

R117

0R(5%)

C81 220pF/50V(5%)

C116

0.1uF/16V(10%)

C85 220pF/50V(5%)

R110 10K(5%)(NC)

R89 47R(1%)

C106

0.1uF/16V(10%)

J8

A2001WR-S-2P

R118 0R(5%)

C87 220pF/50V(5%)

U12

CX20721-11Z/CX22721-11Z

DACDAT1MCLK

2

VDDIO

3

SCL4SDA5MUSIC_REQ/SPDIF/GPIO06SPKR_MUTE#/SPDIF/GPIO17PORTC_DMIC_DATA1/GPIO3

8

DVDD_IO

9

PORTC_DMIC_CLK1/GPIO210EAPD

11

PORTG_LEFT_P

12

PVDD5_LEFT

13

PORTG_LEFT_N

14

PORTG_RIGHT_N

15

PVDD5_RIGHT

16

PORTG_RIGHT_P

17

CP_VDD18

18

CP_FLY_P

19

CP_FLY_N

20

CP_VNEG

21

CP_VPOS

22

PORTA_L

23

PORTA_R

24

HGNDA25HGNDB

26

VREF_DAC

27

VREFP

28

AVDD5

29

PORTD_A30PORTD_B

31

MICBIASB

32

PORTB_L

33

PORTB_R

34

JSENSE

35

PCBEEP

36

LDO_AVDD

37

VDD18

38

LDO_VDD_CORE

39

BCLK40LRCLK41ADCDAT

42

EXP_GND

43

R100 47R(1%)

C107

4.7uF/10V(20%)

C118

10uF/16V(20%)

R119 0R(5%)

C197

10nF/50V(10%)

TP5

1

R112 0R(5%)

C105 0.47uF/16V(10%)

D28

LESD8D3.3CAT5G(NC)

C114

10uF/16V(20%)

C82 220pF/50V(5%)

TP44

1

R105 33R(5%)(NC)

C104 1uF/16V(10%)

TP47

1

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Disclaimer and Copyright Notice

Information in this document, including URL references, is subject to change without notice.

THIS DOCUMENT IS PROVIDED AS IS WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.

All liability, including liability for infringement of any proprietary rights, relating to use of information in this document is disclaimed. No licenses express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein.

The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a registered trademark of Bluetooth SIG.

All trade names, trademarks and registered trademarks mentioned in this document are property of their respective owners, and are hereby acknowledged.

Espressif IoT Team"

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