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Figure 12-1.
I2C Connections
Jetson
SoC – I2C
GP54_I2C3_CLK
GP55_I2C3_DAT
GP126_I2C1_CLK
GP127_I2C1_DAT
GP15_I2C8_CLK
GP16_I2C8_DAT
GP13_I2C2_CLK
GP14_I2C2_DAT
12.1.1
I2C Design Guidelines
Care must be taken to ensure I2C peripherals on the same I2C bus connected to the Jetson
Orin NX, do not have duplicate addresses. Addresses can be in two forms: 7-bit, with the
read/write bit removed or 8-bit including the read/write bit. Be sure to compare I2C device
addresses using the same form (all 7-bit or all 8-bit format).
Note: The Jetson Orin NX I2C interfaces have 1.5 kΩ pull-ups on the module. Pads for additional
pull-ups are recommended in case a stronger pull-up is required due to additional loading on
the interfaces.
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.
PRELIMINARY INFORMATION
NVIDIA Jetson Orin NX
1.5kΩ
VDD_3V3_SYS
1.5kΩ
CAM_I2C_SCL
213
CAM_I2C_SDA
215
1.5kΩ
VDD_1V8
1.5kΩ
I2C2_SCL
232
I2C2_SDA
234
1.5kΩ
VDD_3V3_SYS
1.5kΩ
I2C1_SCL
189
I2C1_SDA
191
1.5kΩ
VDD_3V3_SYS
1.5kΩ
I2C0_SCL
185
I2C0_SDA
187
Requirement
100 / 400 / 1000
Single ended, bi-directional, multiple initiators/targets
400
GND or PWR
50 – 60
1x
3400 (~20)
1700 (~10)
Used as camera module control interface
or available for misc. 3.3V I2C devices.
Available for misc. 1.8V I2C devices
Available for misc. 3.3V I2C devices
Available for misc. 3.3V I2C devices
Units
Notes
kHz
See Note 1
pF
Total of all loads
Ω
±15%
dielectric
ps (in)
Miscellaneous Interfaces
DG-10931-001_v0.1 | 62
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