Table 12-2. I2C Interface Signal Routing Requirements; Table 12-3. I2C Signal Connections - Nvidia Jetson Xavier NX Design Manual

Table 12-2. I2C Interface Signal Routing Requirements

Parameter
Max frequency: Standard-mode / Fm / Fm+
Topology
Max loading: Standard-mode / Fm / Fm+
Reference plane
Trace impedance
Trace spacing
Max trace length/delay
Standard Mode
Fm, Fm+ Modes
Notes:
1. Fm = Fast-mode, Fm+ = Fast-mode Plus
2. Avoid routing I2C signals near noisy traces, supplies or components such as a switching power regulator.
3. No requirement for decoupling caps for PWR reference.

Table 12-3. I2C Signal Connections

Module Pin Name Type
I2C0_SCL/SDA I/OD
I2C1_SCL/SDA I/OD
I2C2_SCL/SDA I/OD
CAM_I2C_SCL/SDA I/OD
Notes:
1. If some devices require a different voltage level than others connected to the same I2C bus, level shifters are required.
2. For I2C interfaces that are pulled up to 1.8V, disable the E_IO_HV option for these pads. For I2C interfaces that are pulled up to
3.3V, enable the E_IO_HV option. The E_IO_HV option is selected in the Pinmux registers.
NVIDIA Jetson Xavier NX
Requirement
100 / 400 / 1000
Single ended, bi-directional, multiple initiators/targets
400
GND or PWR
50 – 60
1x
3400 (~20)
1700 (~10)
Termination
2.2kΩ pull-ups to
VDD_3V3_SYS on Jetson Xavier
NX
2.2kΩ pull-ups to
VDD_3V3_SYS on Jetson Xavier
NX
2.2kΩ pull-ups to VDD_1V8 on
Jetson Xavier NX
2.2kΩ pull-ups to
VDD_3V3_SYS on Jetson Xavier
NX
Units
kHz
pF
Ω
dielectric
ps (in)
Description
I2C #0 Clock and Data. Connect to CLK and Data pins of any 3.3V
devices
I2C #1 Clock and Data. Connect to CLK and Data pins of 3.3V
devices.
I2C #2 Clock and Data. Connect to CLK and Data pins of any 1.8V
devices
Camera I2C Clock and Data. Connect to CLK and Data pins of
any 3.3V devices
Miscellaneous Interfaces
Notes
See Note 1
Total of all loads
±15%
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