Nvidia Jetson TX2 Manual page 64

Figure 35. I2C Connections
Jetson TX2/TX2i
Tegra – I2C
SYS
PWR_I2C_SCL
I2C5
PWR_I2C_SDA
GEN1_I2C_SCL
I2C1
GEN1_I2C_SDA
CAM
CAM_I2C_SCL
I2C3
CAM_I2C_SDA
UART
GEN7_I2C_SCL
I2C7
GEN7_I2C_SDA
GEN9_I2C_SCL
I2C9
GEN9_I2C_SDA
AO
GPIO_SEN8
I2C2
GPIO_SEN9
GEN8_I2C_SCL
I2C8
GEN8_I2C_SDA
DP DP_AUX_CH0_P
I2C6
DP_AUX_CH0_N
DP_AUX_CH1_P
I2C4
DP_AUX_CH1_N
I2C Design Guideline s
Care must be taken to ensure I2C peripherals on same I2C bus connected to the module do not have duplicate addresses.
Addresses can be in tw o forms: 7-bit, w ith 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).
Table 68. I2C Interface Signal Routing Requirements
Parameter
Max Frequency
Topology
Max Loading
Reference plane
Trace Impedance
Trace Spacing
Max Trace Delay
Note: Fm = Fast-mode, Fm+ = Fast-mode Plus
1.
Avoid routing I2C signals near noisy traces, supplies or components such as a switching power regulator.
2.
No requirement for decoupling caps for PWR reference
3.
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
1kΩ
VDD_1V8
1kΩ
On-Module
Usage Only
1kΩ
VDD_3V3_SYS
1kΩ
I2C_GP1_CLK
I2C_GP1_DAT
1kΩ
VDD_1V8
1kΩ
I2C_CAM_CLK
I2C_CAM_DAT
1kΩ
VDD_1V8
1kΩ
I2C_GP2_CLK
I2C_GP2_DAT
1kΩ
VDD_1V8
1kΩ
I2C_GP3_CLK
I2C_GP3_DAT
1kΩ
VDD_1V8
1kΩ
I2C_GP0_CLK
I2C_GP0_DAT
1kΩ
VDD_1V8
1kΩ
I2C_PM_CLK
I2C_PM_DAT
DP0_AUX_CH+
DP0_AUX_CH–
DP1_AUX_CH+
DP1_AUX_CH–
Requirement
Standard-mode / Fm / Fm+ 100 / 400 / 1000
Single ended, bi-directional, multiple masters/slaves
Standard-mode / Fm / Fm+ 400
GND or PWR
50 – 60
1x
Standard Mode 3400 (~20)
Fm & Fm+ 1700 (~10)
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
Used on-module for power monitors, & typically off-
A21
module for GPIO expansion or other misc 3.3V I2C usage
A20
Used as camera module
C6
control interface
D6
Available for misc.
C11
1.8V I2C devices
C10
Available for misc.
C12
1.8V I2C devices
C13
Available for misc.
E15
1.8V I2C devices
D15
Available for misc.
A6
1.8V I2C devices
B6
Typically used for eDP. Otherwise
B3 5
available for Misc 1.8V/3.3V I2C usage.
B3 4
Typically used for HDMI or DP. Otherwise
A35
available for Misc 1.8V/3.3V I2C usage.
A34
Units
kHz
pF
Ω
dielectric
ps (in)
Notes
See Note 1
Total of all loads
±15%
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