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Table 11-2.
I2C Interface Signal Routing Requirements
Parameter
Max frequency
mode / Fm / Fm+
Topology
Max loading
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 11-3.
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 TX2 NX
Requirement
Standard-
100 / 400 / 1000
Single ended, bi-directional, multiple masters/slaves
Standard-
400
GND or PWR
50 – 60
1x
3400 (~20)
1700 (~10)
Termination
2.2kΩ pull-ups to VDD_3V3_SYS on Jetson
TX2 NX
2.2kΩ pull-ups to VDD_3V3_SYS on Jetson
TX2 NX
2.2kΩ pull-ups to VDD_1V8 on Jetson TX2
NX
2.2kΩ pull-ups to VDD_3V3_SYS on Jetson
TX2 NX
Miscellaneous Interfaces
Units
Notes
kHz
See Note 1
pF
Total of all loads
Ω
±15%
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
DG-10141-001_v1.1 | 59
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