> For the complete documentation index, see [llms.txt](https://auvidea.gitbook.io/j20/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://auvidea.gitbook.io/j20/manual/j20-overview.md).

# J20 Overview

<figure><img src="/files/UTEMZQGOKAfBCj0SyLLy" alt="" width="563"><figcaption></figcaption></figure>

## Product SKU

<table><thead><tr><th width="173">SKU</th><th>Description</th></tr></thead><tbody><tr><td>70723</td><td>Standard version</td></tr></tbody></table>

## Document versions and changes

<table><thead><tr><th width="118">Version</th><th>Changes</th></tr></thead><tbody><tr><td>1.0</td><td>Internal verification</td></tr><tr><td>1.1</td><td>Initial release on Gitbook</td></tr></tbody></table>

{% hint style="warning" %}
Auvidea can take no responsibility for the accuracy or completeness of any information presented in an exported PDF document as the export feature is developed, managed and maintained by GitBook. Those export mechanisms are subject to change without interaction by Auvidea. Please note that Auvidea includes this version table to identify the document and reference changes.
{% endhint %}

## Product revisions and changes

<table><thead><tr><th width="134.5">Version</th><th>Changes</th></tr></thead><tbody><tr><td>38223-1</td><td>very limited supply patch for power up reset of GPIO port expander</td></tr><tr><td>38223-2</td><td>Fixed bugs from previous revision</td></tr></tbody></table>

## 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:&#x20;

* TX1 Devkit (SKU: 945-82371-0005-000[^1]†)
* AGX Xavier Devkit (SKU: 945-82972-0045-000[^1]†)
* AGX Orin Devkit (SKU: 945-13730-0055-000)

{% hint style="info" %}
† -> End of life for this product is already reached
{% endhint %}

{% hint style="info" %}
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. &#x20;
{% endhint %}

## 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.&#x20;

The following table gives a brief overview over the translation.&#x20;

<table><thead><tr><th width="86">port</th><th width="62">I2C</th><th width="118">translation</th><th width="180">Pi camera 1.3</th><th width="171">Pi camera 2.1</th><th>B101/B102</th></tr></thead><tbody><tr><td>J1_1</td><td>0</td><td>-</td><td>0x36</td><td>0x64</td><td>0x0F</td></tr><tr><td>J1_2</td><td>6</td><td>-</td><td>0x36</td><td>0x64</td><td>0x0F</td></tr><tr><td>J1_3</td><td>2</td><td>-</td><td>0x36</td><td>0x64</td><td>0x0F</td></tr><tr><td>J2_1</td><td>0</td><td>✓</td><td>0x34</td><td>0x12</td><td>0x0D</td></tr><tr><td>J2_2</td><td>6</td><td>✓</td><td>0x34</td><td>0x12</td><td>0x0D</td></tr><tr><td>J2_3</td><td>2</td><td>✓</td><td>0x34</td><td>0x12</td><td>0x0D</td></tr></tbody></table>

<figure><img src="/files/zSlkeBTLsJbEgWm22kal" alt=""><figcaption></figcaption></figure>

[^1]: End of life