VERSION 1.9
J120 (38198-X)
FAN (J8)
This is a 4 pin connector with 1.25 mm pitch. This is the same pinout as the fan connector on the Jetson TX1
development kit. With the J100 the fan is on by default. Use the „fan disable“ feature to turn off the fan.
Please note, that the „fan disable“ requires a software change when compared to the dev kit. On the dev kit
„fan disable“ is controlled by an I2C port expander line. On the J100 „fan disable“ is connected to
GPIO19_AUD_RST (through an inverting MOSFET). Pull the GPIO19 (F2) high to disable the fan (pin 4 becomes
low). A low or floating signal on GPIO19 will not disable the fan.
Power (J11)
This is a 4 pin connector with 1.25 mm pitch. Power in 1 and power in 2 are or’ed with 2 Schottky diodes. They
may be tied together or they may be connected to 2 redundant power supplies.
Pin
Function
Jetson TX1
GPIO
Description
1
5V
-
-
5V power output (3.3V if only the MCU is powered)
2
UART0_TXD
-
-
UART 0 console port (3.3V TTL level): transmit data output
- tunnelled through the watchdog
3
UART0_RXD
-
-
UART 0 console port (3.3V TTL level): receive data input -
tunnelled through the watchdog
4
UART2_TXD
SWCLK
B16
-
UART 2 console port (3.3V TTL level): transmit data output
- port to flash watchdog MCU
5
UART2_RXD
SWDIO
B15
-
UART 2 console port (3.3V TTL level): receive data output -
port to flash watchdog MCU
6
GND
-
-
Ground
Pin
Function
Jetson TX1
Description
1
GND
-
Ground
2
5V
-
5V power supply to the fan
3
FAN_TACH
B17
tachometer from the fan (open drain input with 100k pull-up to 1.8V)
4
FAN_PWM
C16
PWM control to the fan (open drain output: controlled by FAN_PWM
and „disable fan“ with GPIO19 - F2)
Pin
Function
Jetson TX1
Description
1
power in 1
-
power input: typical 12V (range: 7V to 17V)
2
power in 2
-
power input: typical 12V (range: 7V to 17V)
3
GND
-
power ground
4
GND
-
power ground
AUVIDEA GMBH
TECHNICAL REFERENCE MANUAL
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