The J90 is a compact carrier board with the lowest vertical size. There are no components on the bottom side. The "J90" is the fully featured version: 2x UART, 2x CSI-2 (22 pin, 0.5mm pitch for IMX219 camera or B102 module), 100BT Ethernet (capacitive coupled - for short connections within a system or a room), 2x I2C (3.3V), 1x SPI (3.3V), GPIOs (3.3V), 1x micro USB 2.0, 1x micro USB 3.0, fan connector, 2nd CSI-2 (22 pin, 0.5mm pitch), 1x CAN (TX2 only), IMU (MPU-9250), and watchdog (STM32F042 MCU). Optional 40 pin RPi like GPIO header (this header may be added on the bottom side - note: some signals are 1.8V level). Note: not supported yet by TX2 with Jetpack 4.2! (use Jetpack 3.3 or older versions)

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	technical reference manual	3D model (STEP)