Figure 11-1. Audio Codec Connection Example; Table 11-2. I2S Interface Signal Routing Requirements - Nvidia Jetson Xavier NX Design Manual

Figure 11-1. Audio Codec Connection Example
Avail. Jetson
Module GPIO
(see note 1)
Jetson Module
GPIO09
(AUD_MCLK)
I2Sx_SCLK
I2Sx_FS
Jetson Module
I2Sx_DOUT
I2S0 or I2S1
I2Sx_DIN
I2C2_SDA
Jetson Module
I2C2_SCL
I2C (see note 2)
Notes:
1. The Interrupt pin from the audio codec can connect to any available Jetson Xavier NX GPIO. If the
pin must be wake-capable, choose one of the GPIOs that supports this function.
2. I2C2 supports 1.8V operation since the interface is pulled to 1.8V through 2.2 kΩ resistors on the
module. If another I2C interface on Jetson Xavier NX is used, a level shifter will be required as all
the others are 3.3V.
3. Refer to the Intel High Definition Audio/AC'97 website for the latest information:
https://www.intel.com/content/www/us/en/support/articles/000005512/boards-and-kits/desktop-
boards.html.

Table 11-2. I2S Interface Signal Routing Requirements

Parameter
Configuration / device organization
Max loading
Reference plane
Breakout region impedance
Trace impedance
Via proximity (signal to reference)
Trace spacing Microstrip or Stripline
Max trace length/delay
Max trace length/delay skew between SCLK and
SDATA_OUT/IN
Note: Up to four signal vias can share a single GND return via.
NVIDIA Jetson Xavier NX
Audio Codec
IRQ
MICBIAS
MCLK
BCLK
LRCLK
SDIN
MICROPHONE_IN_L
SDOUT MICROPHONE_IN_R
HP_JACK_DETECT
HEADPHONE_OUT_R
PRESENCE# HEADPHONE_OUT_L
MIC_IN_DETECT
SDA
SCL
Requirement
1
8
GND
Min width/spacing
50
< 3.8 (24)
2x
~22 (3600)
~1.6 (250)
2.2uF
Audio Panel
Header
PORT _1L 1
1uF
PORT _1R
3
1uF
PORT _2R 5
SENSE_SEND 7
PORT _2L
9
Units
load
pF
Ω
mm (ps)
dielectric
In (ps)
In (ps)
Audio
VDD_1V8
2 GND
PRESENCE#
4
SENSE1_RETURN
6
8 Key
SENSE2_RETURN
10
Notes
±20%
See note 1
See note 2
See note 2
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