Nuvoton NAU88C22 User manual

NAU88C22 Demo Board User Manual
MAY. 25, 2021 Page 1of 21 Rev1.0
NAU88C22 Demo Board
User Manual
The PCB name: EVB-NAU88C22YG_V1.0
Ordering P/N: NL-NAU88C22
The information described in this document is the exclusive intellectual property of
Nuvoton Technology Corporation and shall not be reproduced without permission from Nuvoton.
Nuvoton is providing this document only for reference purposes of microcontroller based system design.
Nuvoton assumes no responsibility for errors or omissions.
All data and specifications are subject to change without notice.
For additional information or questions, please contact: Nuvoton Technology Corporation.
www.nuvoton.com

NAU88C22 Demo Board User Manual
MAY. 25, 2021 Page 2of 21 Rev1.0
TABLE OF CONTENTS
1OVERVIEW ................................................................................ 5
2INTRODUCTION.......................................................................... 6
2.1 Top View ....................................................................................... 7
2.2 Input / Output.................................................................................. 8
2.3 Jumpers ...................................................................................... 10
2.4 Schematic.................................................................................... 15
2.5 Bare Board................................................................................... 17
3CONNECTED TO AUDIO CONTROL BOARD .................................... 18
4APPLICATION........................................................................... 19
5REVISION HISTORY................................................................... 21

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List of Figure
Figure 2-1 NAU88C22 Demo Board......................................................................6
Figure 2.1-1 Top View...........................................................................................7
Figure 2.2-1 Input / Output....................................................................................8
Figure 2.3-1 Jumpers..........................................................................................10
Figure 2.4-1 Schematic (page 1).........................................................................15
Figure 2.4-2 Schematic (page 2).........................................................................16
Figure 2.5-1 Top View of Bare Board..................................................................17
Figure 3-1 Connection Audio Control Board .......................................................18
Figure 3-2 Signal Path ........................................................................................18

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List of Tables
Table 2.1-1 Main Components..............................................................................7
Table 2.2-1 Input / Output.....................................................................................9
Table 2.3-1 Jumpers...........................................................................................14

NAU88C22 Demo Board User Manual
MAY. 25, 2021 Page 5of 21 Rev1.0
1 OVERVIEW
The NAU88C22 is a low power, high quality CODEC for portable and general purpose audio
applications. In addition to precision 24-bit stereo ADCs and DACs, this device integrates a broad
range of additional functions to simplify implementation of complete audio system solutions. The
NAU88C22 includes drivers for speaker, headphone, and differential or stereo line outputs, and
integrates preamps for stereo differential microphones, significantly reducing external component
requirements. Also, a fractional PLL is available to accurately generate any audio sample rate for the
CODEC using any commonly available system clock from 8MHz through 33MHz.

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2 INTRODUCTION
The NAU88C22 Demo Board is designed to allow a thorough evaluation of the audio codec.
Figure 2-1 NAU88C22 Demo Board

NAU88C22 Demo Board User Manual
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2.1 Top View
Figure 2.1-1 Top View
Table 2.1-1 Main Components
Name
Description
NAU88C22YG
Audio CODEC

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2.2 Input / Output
Figure 2.2-1 Input / Output

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Table 2.2-1 Input / Output
Name
Description
J_CB
Pin 1
I2S Interface
MCLK, Master Clock
Pin 11
I2C Interface
SDA
Pin 3
BCLK, Bit Clock
Pin 13
SCL
Pin 5
DACIN
Pin15
Power.
Provide power
to Demo board.
VDDIO
Pin 7
ADCOUT
Pin 17
VDD1.8
Pin 9
FS ,Frame Sync
Pin 19
VDD3.3
Pin 21
VDD5
JP_I2S
These pins can also be I2S interface
Pin 1
MCLK, Master Clock
Pin 3
BCLK, Bit Clock
Pin 5
DACIN
Pin 7
ADCOUT
Pin 9
FS ,Frame Sync
JP_I2C_SPI
Pin1 and Pin2 are I2C interface.
In addition, this connector can be an SPI interface.
Pin 1
SDL
Pin 2
SCA
Pin 3
GND
Pin 4
CSB/GPIO1
Pin 5
RLIN/GPIO3
MIC
Microphone input.
Headphone
Headphone output.
Speaker
Speaker out.
AUXIN
Auxiliary input.
AUXOUT
Auxiliary output.

NAU88C22 Demo Board User Manual
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2.3 Jumpers
Figure 2.3-1 Jumpers