NXP Semiconductors MX93AUD-HAT-UM User manual
MX93AUD-HAT-UM
MX93AUD-HAT Board User Manual
Rev. 1 — 14 April 2023 User manual
Document Information
Information Content
Keywords MX93AUD-HAT-UM, i.MX 93
Abstract The MX93AUD-HAT is an entry level audio evaluation platform that is fully compatible with the
MCIMX93-EVK. It includes a multi-channel codec, S/PDIF, and microphone interfaces. This
document supports Board Revision A and B.
NXP Semiconductors MX93AUD-HAT-UM
MX93AUD-HAT Board User Manual
1 MX93AUD-HAT Overview
The MX93AUD-HAT is an entry level audio evaluation platform that is fully compatible with the MCIMX93-EVK.
It includes a multi-channel codec, S/PDIF, and microphone interfaces.
For further information about MX93AUD-HAT, see http://www.nxp.com/.
1.1 Acronyms and abbreviations
The following table lists the acronyms and abbreviations used in this document.
Term Description
ADC Analog-to-digital converter
DAC Digital-to-analog converter
I2S Inter-IC sound
PDM Pulse density modulation
S/PDIF Sony / Philips Digital InterFace
I2C Inter-integrated circuit
LDO Low dropout regulator
LED Light-emitting diode
Table 1. Acronyms and abbreviations
1.2 Related documentation
The table below lists and explains the additional documents and resources that you can refer to for more
information on the MX93AUD-HAT board. Some of the documents listed below may be available only under a
non-disclosure agreement (NDA). To request access to these documents, contact your local field applications
engineer (FAE) or sales representative.
Document Description Link / how to access
i.MX 93 Applications Processor
Reference Manual
Intended for system software and hardware
developers and application programmers who want
to develop products with i.MX 93 MPU
IMX93RM
i.MX 93 Industrial Application
Processors Data Sheet
Provides information about electrical
characteristics, hardware design considerations,
and ordering information
IMX93IEC
i.MX93 Hardware Developer's
Guide
This document aims to help hardware engineers
design and to test their i.MX 93 processor-based
designs. It provides information about board layout
recommendations and design checklists to ensure
first-pass success and avoidance of board bring-up
problems.
IMX93HDG
Table 2. Related documentation
1.3 Board kit contents
The table below lists the items included in the MX93AUD-HAT hardware kit.
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NXP Semiconductors MX93AUD-HAT-UM
MX93AUD-HAT Board User Manual
Item Quantity
MX93AUD-HAT 1
Jumper sockets (installed) 5
Table 3. Board kit contents
1.4 Block diagram
The following figure shows the block diagram of the MX93AUD-HAT board.
CS42448
8-CH Line Out,2-CH per Jack
4-CH Line In, 2-CH per Jack
2-CH Microphone, 1-CH per Jack
S/PDIF RX
S/PDIF TX
I2S
8MIC-RPI-MX8
2X20pins
2.54mm pitch
GPIOs
I2C
PDM
S/PDIF RX
S/PDIF TX
2X20pins
2.54mm
pitch
GPIOs
S/PDIF
Buff
Figure 1. MX93AUD-HAT board block diagram
1.5 Board pictures
The following figures show the top and bottom side of the MX93AUD-HAT board, and also highlight the
connectors, jumpers, and LED available on the board.
The outline size of the board is 119 x 63 x 1.6 mm.
The following figure shows the top side of the board, and highlights the connectors available on the board (see
Section 1.7 for detail).
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NXP Semiconductors MX93AUD-HAT-UM
MX93AUD-HAT Board User Manual
RCA connector (J3)
TX
TOSLINK connector (J16)
RX
TOSLINK connector (J17)
RCA connector (J5)
LINE IN
connectors (J9, J8)
LINE OUT connectors
(J10, J12, J13, J11)
AMIC
connectors (J7, J6)
DMIC connector
(J21)
Figure 2. MX93AUD-HAT top-side view
The following figure shows the bottom side of the board, and highlights the connector available on bottom side
of the board.
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NXP Semiconductors MX93AUD-HAT-UM
MX93AUD-HAT Board User Manual
AUDIO HAT
connector (J20)
Figure 3. MX93AUD-HAT bottom-side view
The following figure shows the top side of the board, and highlights the jumpers and LEDs available on the
board (seeSection 1.8 and Section 1.9 for detail).
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NXP Semiconductors MX93AUD-HAT-UM
MX93AUD-HAT Board User Manual
D1
S/PDIF receiver
(J18)
S/PDIF transmit
(J15)
3V3 LDO power
control (J2)
3V3 path selection
(J4)
5V power control (J1)
Figure 4. MX93AUD-HAT jumpers and LED
1.6 Board features
The table below lists the features of MX93AUD-HAT board.
Board feature Processor feature used Description
Interfacing with Main board 40-pin connector used for MX93AUD-HAT board
connection with the motherboard such as MCIMX93-EVK.
Power 3.3 V MX93AUD-HAT board can be powered either by onboard
3.3 V or 3.3 V from motherboard.
I2C I2C MX93AUD-HAT is configured through the I2C interface at
address 1001 000x.
I2S Supports one onboard codec CS42448 that provides six
multi-bit analog-to-digital and eight multi-bit digital-to-
analog delta-sigma converters.
PDM MX93AUD-HAT board supports one PDM interface (J21) to
connect to the digital microphone board.
Audio
S/PDIF MX93AUD-HAT board provides two TOSLINK+RCA ports
for S/PDIF receive and transmit.
Table 4. Board main features
1.7 Connectors
The following table describes the connectors available on the MX93AUD-HAT board.
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NXP Semiconductors MX93AUD-HAT-UM
MX93AUD-HAT Board User Manual
Part identifier Connector type Description
J20 2x20-pin connector Audio Hat connector. It is 2.54 mm pitch, female
connector, responsible for communication with
motherboard, such as MCIMX93-EVK and so on. See
Section 1.7.1 for more detail.
J21 2x20-pin connector It is used to provide PDM interface and is used for
connection with digital microphone board 8MIC-RPI-MX8.
J3 RCA connector Coaxial cable connector for digital audio signals
transmission
J16 TOSLINK connector Optical fiber connector for digital audio signals
transmission
J5 RCA connector Coaxial cable receiver connector for digital audio signals
J17 TOSLINK connector Optical fiber receiver connector for digital audio signals
J6
J7
Single-ended analog input connector for CS42448 audio
codec (AIN5B/AIN5A/AIN6B/AIN6A pins)
J8
J9
PJ31360, 3.5 mm audio jack
Differential analog input connector for CS42448 audio
codec (AIN1+/-, AIN2+/-, AIN3+/-, AIN4+/- pins)
J10 CS42448 audio codec Line 1 and Line 2 analog output
connector
J12 CS42448 audio codec Line 3 and Line 4 analog output
connector
J13 CS42448 audio codec Line 5 and Line 6 analog output
connector
J11
PJ31360, 3.5 mm audio jack
CS42448 audio codec Line 7 and Line 8 analog output
connector
Table 5. Connectors
1.7.1 Audio Hat connector
Figure 5 shows the description of each pin of the 2x20-pin connector. This connector supports I2S, 4-lane PDM,
S/PDIF I/O, I2C and some control pins, all signals are 3.3 V logic level.
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MX93AUD-HAT Board User Manual
P5V
2
1
P3V3
P5V
4
3
DC_I2C_SDA
GND
6
5
DC_I2C_SCL
-
8
7
PDM_CLOCK
-
10
9
GND
DC_I2S1_RX_BCLK
12
11
DC_I2S1_MCLK
GND
14
13
PUSHBUTTON_INT
SPDIF_OUT
16
15
SPDIF_IN
DC_INT
18
17
P3V3
GND
20
19
-
DC_RESET 22 21 -
-
24
23
-
-
26
25
GND
DC_GPIO1
28
27
MIC_MUTE_INT
GND 30 29 PDM_BITSTREAM_0
PDM_BITSTREAM_2
32
31
PDM_BITSTREAM_1
GND
34
33
PDM_BITSTREAM_3
DC_I2S1_TX_BCLK
36
35
DC_I2S1_RX_SYNC
DC_I2S1_RX_D0
38
37
DC_I2S1_TX_SYNC
DC_I2S1_TX_D0
40
39
GND
Figure 5. Audio Hat connector (J20)
Table 6 describes the pin description of the J20 connector. All signals are grouped by functions and their
directions are mentioned with respect to MX93AUD-HAT board.
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MX93AUD-HAT Board User Manual
Pin
Number
Pin Name GPIO Mapping I/O Voltage
(V)
Description
3 DC_I2C_SDA GPIO2_I2C4.SDA I/O 3.3
5 DC_I2C_SCL GPIO3_I2C4.SCL I 3.3
I2C bus
7 PDM_CLOCK GPIO4 I 3.3
29 PDM_BITSTREAM_0 GPIO5 O 3.3
31 PDM_BITSTREAM_1 GPIO6 O 3.3
32 PDM_BITSTREAM_2 GPIO12 O 3.3
33 PDM_BITSTREAM_3 GPIO13 O 3.3
PDM interface for 8MIC-RPI-MX8
board
11 DC_I2S1_MCLK GPIO17 I 3.3
12 DC_I2S1_RX_BCLK GIO18 I 3.3
35 DC_I2S1_RX_SYNC GPIO19 I 3.3
38 DC_I2S1_RX_D0 GPIO20 O 3.3
36 DC_I2S1_TX_BCLK GPIO16 I 3.3
37 DC_I2S1_TX_SYNC GPIO26 I 3.3
40 DC_I2S1_TX_D0 GPIO21 I 3.3
I2S interface, include 1-lane RX
and 1-lane TX.
MX93AUD-HAT board (CS42448)
as slave device by default
15 SPDIF_IN GPIO22 O 3.3
16 SPDIF_OUT GPIO23 I 3.3
S/PDIF I/O
13 PUSHBUTTON_INT GPIO27 O 3.3 Button interrupt signal from 8MIC-
RPI-MX8 board
27 MIC_MUTE_INT GPIO0 I 3.3 Mute signal to 8MIC-RPI-MX8
board
18 DC_INT GPIO24 O 3.3 CS42448 interrupt signal
22 DC_RESET GPIO25 I 3.3 Reset CS42448, active low
28 DC_GPIO1 GPIO1 I 3.3 Power control signal, active high
1, 17 P3V3 - Pi 3.3 3.3 V power supply
2,4 P5V - Pi 5.0 5.0 V power supply
9, 14, 20,
25,30, 39
GND - P 0 Ground
Table 6. Audio Hat connector pin description with GPIO mapping
1.8 Jumpers
To facilitate the development and debugging and for the diversity of functions, some jumpers have been added
to the MX93AUD-HAT board. The following table describes the jumpers available on the board.
Part identifier Jumper type Name/Function Settings
J1 1x2 header 5 V power control •Open: Disconnect 5 V power supply from
the motherboard to the MX93AUD-HAT
board
Table 7. Jumper Description
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Part identifier Jumper type Name/Function Settings
•Shorted: Connect 5 V power supply from
the motherboard to the MX93AUD-HAT
board [Default setting]
J2 1x2 header 3V3 LDO power control •Open: Disconnect 3.3 V LDO U1 input path
•Shorted: Connect 3.3 V LDO U1 input path
[Default setting]
J4 1x3 header 3.3 V path selection •1-2 shorted: 3.3 V source from motherboard
•2-3 shorted: 3.3 V source from on board
LDO (default setting)
J15 1x3 header S/PDIF transmit •1-2 shorted: TOSLINK port is used for S/
PDIF transmit
•2-3 shorted: RCA port is used for S/PDIF
transmit (default setting)
J18 1x3 header S/PDIF receiver •1-2 shorted: TOSLINK port is used as S/
PDIF receiver
•2-3: RCA port is used as S/PDIF receiver
(default setting)
Table 7. Jumper Description...continued
1.9 LED
The MX93AUD-HAT board has one LED with detail as below:
•LED color - Red
•Part Identifier - D1
•LED name - 5 V
•Description - LED for 5 V power supply. When On, indicates that 5 V power supply is available on board.
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