I2C Design Guidelines; Figure 11-1. I2C Connections - Nvidia Jetson TX2 NX Manual

Figure 11-1. I2C Connections
Tegra – I2C
SYS
PWR_I2C_SCL
PWR_I2C_SDA
CAM
CAM_I2C_SCL
CAM_I2C_SDA
CONN
GEN1_I2C_SCL
GEN1_I2C_SDA
AO
GPIO_SEN8
GPIO_SEN9
GEN8_I2C_SCL
GEN8_I2C_SDA
Note: If an I2C interface is routed to an M.2 Key E or M.2 Key M socket, it is recommended that
0Ω series resistors be included on the lines. If the design will be used with WiFi modules that
require I2C then the 0Ω series resistors would be installed. However, the WiFi modules must be
fully spec compliant and not hold the I2C lines low during boot, which could interfere with
communications with other devices on this I2C bus and possibly prevent the system from
booting.
11.1.1

I2C Design Guidelines

Care must be taken to ensure I2C peripherals on same I2C bus connected to Jetson TX2 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). The I2C2 interface is connected to an EEPROM on
the module which uses I2C address 7'h50. The CAM_I2C interface is connected to the power
monitor device on the module which uses I2C address 7'h40.
Notes:
The Jetson TX2 NX I2C interfaces have 2.2kΩ 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.
The I2C pad LPMD bit is set by default for the I2C[2:0] pins, but not for the CAM_I2C pins. These
•
settings can be changed if necessary, to improve signal integrity.
NVIDIA Jetson TX2 NX
Jetson
VDD_1V8
On-Module
Usage Only
2.2kΩ
VDD_3V3_SYS
2.2kΩ
CAM_I2C_SCL
CAM_I2C_SDA
2.2kΩ
VDD_3V3_SYS
2.2kΩ
2.2kΩ
VDD_3V3_SYS
2.2kΩ
2.2kΩ
VDD_1V8
2.2kΩ
Used as camera module control interface
213
or available for misc. 3.3V I2C devices.
215
I2C0_SCL
185
Available for misc. 3.3V I2C devices
I2C0_SDA
187
I2C1_SCL
189
Available for misc. 3.3V I2C devices
I2C1_SDA
191
I2C2_SCL
232
Available for misc. 1.8V I2C devices
I2C2_SDA
234
Miscellaneous Interfaces
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