Integration guide (Axel)

Info Box Applies to Axel Ultra Applies to Axel Lite

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	THIS PAGE IS OBSOLETE, DON'T USE IT AS REFERENCE
The new documentation is available here: AXEL_Lite_SOM/AXEL_Lite_Hardware

Introduction

This page provides useful information and resources to system designers in order to quickly integrate AXEL SoMs in his/her application. These information complement SoM-independent recommendations provided in the Carrier board design guidelines (SOM) page.

Several topics are covered, ranging from hardware issues to manufacturing aspects.

Additional very specific guidelines are detailed here here for Axel Ultra SOM.

Software reset management

For Axel Lite SOM, please refer to this section.

For Axel Ultra SOM, please refer to this section.

Bootstrap configuration

For Axel Lite SOM, please refer to this section.

For Axel Ultra SOM, please refer to this section.

Manufacture mode management (Dual Lite/Solo-based systems only)

For Axel Lite SOM, please refer to this section.

For Axel Ultra SOM, please refer to this section.

Power management

Default power management scheme may not be suited for the specific application. That's why it is strongly suggested to verify if it is needed to change it. For more details please refer to this page.

Internal routing information

Axel Lite

A spreadsheet is available for download at this link containing detailed information about Axel Lite routing. These information should be used to check nets matching of the overall system (carrier board + SOM).

Real-time clock (RTC) powering

Axel Lite

Real-time clock is integrated in iMX6 processor. As such, it belongs to SNVS power domain. This domain, in turn, is powered by PMIC, via PMIC_VSNSV rail (see also this page). PMIC integrates a sort of switch. When 3V3VIN voltage is applied, this is used to power SNVS domain. Otherwise energy is drawn from coin cell battery - if any - connected to PMIC_LICELL (for more details please refer to ).

Simplified block diagram of Axel Lite RTC powering scheme

It is worth remembering that 3.0V lithium batteries are supported and that PMIC_VSNSV voltage range is 2.4 - 3.6V. When Axel Lite enters RTC mode and 3V3VIN voltage is removed, typical current absorption from PMIC_LICELL pin is about 135uA. This value is relatively high with respect to the typical lithium coin cell battery capacity (10 - 50mAh). It is recommended that system integrator verify that expected battery lifetime satisfies system requirement. If not, the use of an external low-power RTC device should be considered.