Nuvoton I94100 Series User manual

I94124_NAU88C22_MB
July 30, 2020 Page 1of 22 Rev 1.0
ARM®Cortex®-M4
32-bit Microcontroller
I94124_NAU88C22 User Manual
I94100 Series
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 NuMicro 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

I94124_NAU88C22_MB
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Table of Contents
1Overview....................................................................................5
1.1 I94124_NAU88C22_MB Features....................................................................6
1.2I94124_MB_NAU85L40_NR Features...............................................................6
1.3 I94124_MB_DMIC Features...........................................................................6
2I94124_NAU88C22_MB Board Overview.............................................7
2.1 Front View ................................................................................................7
2.2 Rear View.................................................................................................8
2.3 Power System............................................................................................9
2.4 Pin Assignment for IO Extension Connectors.....................................................10
2.5 System Configuration.................................................................................13
2.5.1 Power Source .......................................................................................13
2.5.2 3.3V LDO.............................................................................................13
2.5.3 USB Connector .....................................................................................13
2.5.4 IO Extension Connectors..........................................................................13
2.5.5 Push-Buttons ........................................................................................13
2.5.6 LED ...................................................................................................13
2.5.7 Power Connectors..................................................................................13
2.5.8 Clock Source ........................................................................................14
2.5.9 Nu-Link Interface....................................................................................14
2.5.10 SPI Flash interface .................................................................................14
2.5.11 Others ................................................................................................14
2.6 Components Placement..............................................................................15
3I94124ADI EVB Schematics........................................................... 17
3.1 I94124_NAU88C22_MB..............................................................................17
3.2 I94124_MB_NAU85L40_NR.........................................................................19
3.3 I94124_MB_DMIC.....................................................................................20
4REVISION HISTORY................................................................... 21

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List of Figures
Figure 1.1-1 I94124_NAU88C22_MB with AMIC/DMIC extension boards...................................... 5
Figure 2.1-1 Front View of I94124_NAU88C22_MB........................................................................ 7
Figure 2.2-1 Rear View of I94124_NAU88C22_MB ........................................................................ 8
Figure 2.3-1 Power Supply Block Diagram...................................................................................... 9
Figure 2.4-1 I94124ADI IO Extension Connectors......................................................................... 10
Figure 2.6-1 I94124_NAU88C22_MB Front Placement ................................................................ 15
Figure 2.6-2 I94124_NAU88C22_MB Rear Placement................................................................. 15
Figure 2.6-3 I94124_MB_NAU85L40_NR Front Placement.......................................................... 16
Figure 2.6-4 I94124_MB_NAU85L40_NR Rear Placement .......................................................... 16
Figure 2.6-5 I94124_MB_DMIC Front Placement.......................................................................... 16
Figure 2.6-6 I94124_MB_DMIC Rear Placement.......................................................................... 16
Figure 3.1-1 I94124_NAU88C22_MB circuit (1/2) I94124 part...................................................... 17
Figure 3.1-2 I94124_NAU88C22_MB circuit (2/2) NAU88C22 part............................................... 18
Figure 3.2-1 I94124_MB_NAU85L40_NR Circuit.......................................................................... 19
Figure 3.3-1 I94124_MB_DMIC Circuit.......................................................................................... 20

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List of Tables
Table 2-1 I94124ADI IO Extension Interface Connector J8........................................................... 11
Table 2-2 I94124ADI IO Extension Interface Connector J5........................................................... 11
Table 2-3 I94124ADI IO Extension Interface Connector J4........................................................... 12
Table 2-4 I94124ADI IO Extension Interface Connector J7........................................................... 12

I94124_NAU88C22_MB
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1 OVERVIEW
I94124_NAU88C22_MB board is the specific development tool for I94100 series with NAU88C22 to
support MIC, AUXIN and headphone on one board. User can use it to develop and verify the audio
application program easily.
To support more microphone, it can connect with I94124_MB_NAU85L40_NR (NAU85L40+AMIC) and
I94124_MB_DMIC (DMIC Daughter board). The connection is as the below figure.
Figure 1.1-1 I94124_NAU88C22_MB with AMIC/DMIC extension boards

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1.1 I94124_NAU88C22_MB Features
Nu-Link ICE interface connector.
Audio board extension interface connectors.
USB 1.1 Full-Speed Device.
Two push-buttons: one is for reset and the other one is for user-defined.
Two LEDs: one is for power indication, the other one is for user-defined.
Two MIC and two AUXIN input through NAU88C22.
Speaker and headphone output through NAU88C22.
1.2 I94124_MB_NAU85L40_NR Features
Maximum 4 channel AMIC supported
Stereo line-in with 2 MIC channels
Two sets of 7-segments LED display by IO control
1.3 I94124_MB_DMIC Features
Maximum 4 channel DMIC channel connection with I94124

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2 I94124_NAU88C22_MB BOARD OVERVIEW
2.1 Front View
Figure 2.1-1 shows the main components and connectors from the front side of EVB-I94124ADI board.
The following lists components and connectors from the front view:
Target Chip: I94124ADI (U1)
Nu-Link interface (J1)
I94124ADI IO extension interface connectors (J4, J5, J6 and J7)
USB: USB connector (CN1)
Push-buttons (SW1, SW2)
LED: POWER LED (D3, green), User Application LED (D4, red)
Power connectors (J1, J2, CN1)
Figure 2.1-1 Front View of I94124_NAU88C22_MB
I94100ADI
Microcontroller
RTC
XTAL
SPI Flash
Interface
12.288
MHz XTAL
AUXIN
Headphone
Out
MIC1
MIC2
N88C22
connection
jumper
LED (Red)
User Button
Reset
VDD_3V3
Jumper
UART
Power LED
(Green)
Nu-Link
Interface
3.3V
VBAT +5V
Speaker
header
NAU88C22YG
USB/Power

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2.2 Rear View
Figure 2.2-1 shows the rear side of I94124_NAU88C22_MB board.
Figure 2.2-1 Rear View of I94124_NAU88C22_MB
SPI Flash

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2.3 Power System
The I94124_NAU88C22_MB supplied by an external 5V USB power connected to Micro USB
connectors (CN1 or J1) or 4.5 Volt to 5.0 Volt DC power supply connected to VCC Pin Header (J2). On-
board reversed 2 current protection diodes will ensure power can be provided through both USB
connectors at the same time safely. If the board is powered from USB connector, it is not recommended
to apply an additional DC power supply to VCC pin header (J2), because there is no protection against
reverse current into the DC power supply. Figure 2.3-1 shows I94124_NAU88C22_MB power supply
concept.
Figure 2.3-1 Power Supply Block Diagram
I94100ADI
USB_
Mini
ICE-5V
DC Power
(Vbat)
LDO
3.3V
VDD
3.3V
VDDA/VDDB/VDDC
USB_5V
D1
Jump
(sp1)
5V
U1
U3
CN1
J2
ICE_5V
J1(Nu_Link)
D2
4.5V~5V
I94124_NAU88C22_MB
NAU88C22YG
VDDSPK

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2.4 Pin Assignment for IO Extension Connectors
Most of IO pins of the I94124ADI are pin out to the connectors J4, J5, J7and J8 for extension. The
Figure 2.4-1 shows the I94124ADI extended IO pins on connectors.
Figure 2.4-1 I94124ADI IO Extension Connectors