Fan; Can - Nvidia Jetson TX2 Manual

12.4 Fan

Jetson TX2/TX2i provides PWM and Tachometer functionality for controlling a fan as part of the thermal solution. Information on
the PWM and Tachometer pins/functions can be found in the follow ing locations:
Module Pin Mux:
▪
This is used to configure the FAN_PWM & FAN_TACH pins. The FAN_PWM pin is configured as GP_PWM4.
The FAN_TACH pin is configured as NV_THERM_FA N_TACH.
Tegra X2 Technical Reference Manual:
▪
Functional descriptions and related registers can be found in the TRM for the FAN_PWM (PWM chapter) &
FAN_TACH (Tachometer chapter) functions.
Jetson Developer Kit Carrier Board Specification:
▪
The document contains the maximum current capability of the VDD_5V0_IO_SYS supply in the Interface Pow er
chapter (VDDIO_5V0_IO_SLP comes from that supply). The fan is pow ered by this supply on the module
Developer Kit carrier board.
Table 78. Fan Pin Descriptions
Pin # Module Pin Name
C16 FAN_PWM
B17 FAN_TACH
Figure 42. Fan Connection Example
Jetson TX2/TX2i
Tegra – Fan
AO
GPIO_SEN6
UART UART5_TX
PS_VDD_FAN_DISABLE
(G PIO Expander P04)
Table 79. Fan Signal Connections
Module Name Type
FAN_PWM
FAN_TACH

12.5 CAN

Jetson TX2/TX2i brings tw o CAN (Controller Area Netw ork) interfaces out to the main connector.
Table 80. CAN Pin Descriptions
Pin # Module Pin Name
C20 CAN_WAKE
E18 CAN0_ERR
D18 CAN0_RX
D19 CAN0_TX
C19 CAN1_ERR
D17 CAN1_RX
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
Tegra Signal Usage/Description
GPIO_SEN6 Fan PWM
UART5_TX Fan Tach
FAN_PWM
C16
FAN_TACH
B1 7
VDD_5V0_IO_SYS
100kΩ
Termination
O
I ESD diode to GND
Tegra Signal Usage/Description
CAN_GPIO4 CAN Wake
CAN_GPIO5 CAN #0 Error
CAN0_DIN CAN #0 Receive
CAN0_DOUT CAN #0 Transmit
CAN_GPIO3 CAN #1 Error
CAN1_DIN CAN #1 Receive
Usage on the Carrier
Board
Fan
VDD_1V8
10uF
D
100Ω
G
S
10pF
D
10pF
G
S
Description
Fan Pulse Width Modulation: Connect through FET as shown in the Fan
Connections figure.
Fan Tachometer: Connect to TACH pin on fan connector.
Usage on the Carrier
Board
GPIO Expansion
Header
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
Direction
Output CMOS – 1.8V
Input CMOS – 1.8V
VDD_5V0_IO_SLP
Fan
0.1uF
Header
4
3
2
1
Direction
Input CMOS 3.3V
Input CMOS 3.3V
Input CMOS 3.3V
Output CMOS 3.3V
Input CMOS 3.3V
Input CMOS 3.3V
Pin Type
Pin Type
69