J20 Overview

Product SKU

SKU	Description
70723	Standard version

Document versions and changes

Version	Changes
1.0	Internal verification
1.1	Initial release on Gitbook

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Product revisions and changes

Version	Changes
38223-1	very limited supply patch for power up reset of GPIO port expander
38223-2	Fixed bugs from previous revision

What is the J20?

The J20 is a CSI adapter board for the devkit camera connector. It allows connecting up to 6 CSI-2 cameras, each 2 Lanes. This board is compatible with the:

• TX1 Devkit (SKU: †)

• AGX Xavier Devkit (SKU: †)

• AGX Orin Devkit (SKU: 945-13730-0055-000)

† -> End of life for this product is already reached

Keep in mind that the camera serial interfaces may changes if you connect it to other devkit boards than the TX1 because the J20 was designed for the TX1 devkit and other most recent devkit from Nvidia are using a slightly different CSI mapping.

I²C Address Translation

Each I²C Bus that is populated on that connector connects to 2 camera ports. Therefore, the J20 implements an I²C address translation to avoid an address conflict if the same camera is connected to both connectors.

The following table gives a brief overview over the translation.

port	I2C	translation	Pi camera 1.3	Pi camera 2.1	B101/B102
J1_1	0	-	0x36	0x64	0x0F
J1_2	6	-	0x36	0x64	0x0F
J1_3	2	-	0x36	0x64	0x0F
J2_1	0	✓	0x34	0x12	0x0D
J2_2	6	✓	0x34	0x12	0x0D
J2_3	2	✓	0x34	0x12	0x0D