I2C Design Guidelines; I2C Routing Guidelines; Figure 12-1. I2C Connections; Table 12-2. I2C Interface Signal Routing Requirements - Nvidia Jetson Orin NX Series Product Manual

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
EEPROM
12.1.1

I2C Design Guidelines

Care must be taken to ensure I2C peripherals on the same I2C bus connected to the Orin
module, 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 Orin module I2C interfaces have pull-ups on the module (See Table 12-1 or Table 12-3
for values). Pads for additional pull-ups are recommended in case a stronger pull-up is required
due to additional loading on the interfaces.
12.1.2

I2C routing Guidelines

This section describes the I2C routing guidelines for Orin module.
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
Jetson Orin NX Series and Jetson Orin Nano Series
2.2kΩ
VDD_3V3_SYS
2.2kΩ
CAM_I2C_SCL
CAM_I2C_SDA
2.2kΩ
VDD_1V8
2.2kΩ
I2C2_SCL
I2C2_SDA
2.2kΩ
VDD_3V3_SYS
2.2kΩ
I2C1_SCL
I2C1_SDA
1.5kΩ
VDD_3V3_SYS
1.5kΩ
I2C0_SCL
I2C0_SDA
ID Power
Monitor
7'h50 7'h40
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
213
or available for misc. 3.3V I2C devices.
215
232
Available for misc. 1.8V I2C devices
234
189
Available for misc. 3.3V I2C devices
191
185
Available for misc. 3.3V I2C devices
187
Units
kHz
pF
dielectric
ps (in)
Miscellaneous Interfaces
Notes
See Note 1
Total of all loads
±15%
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