AXEL ULite adapter

Info Box Applies to AXEL ULite

Introduction

AXELULite adapter is a board that DAVE Embedded Systems has made available to make initial development on AXELULite-based systems easier.

The following image shows a simplified block diagram. TBD

The following sections illustrate in more detail what it integrates and how to use it.

In principle it can be used with any carrier board designed to host AXELULite SOM.

Installation

AXELULite adapter has to be interposed between the carrier board and AXELULite SOM as shown by the following picture.

TBD

Once hardware boards have been assembled, BOOT_MODE and BOOT_CFG signals have to be configured in order to select the desired boot options.

Boot configuration

As described here, GPIO ovverride mode is extremely helpful when it comes to select different boot configuration options. AXELULite adapter provides a bank of switches that allows to change both BOOT_MODE and LCD1_DATAx signals affecting boot configurations. When the switch is in ON position, "1" logic level is selected.

The following table lists all the switches in detail.

Switch reference	iMX6UL signal name	Correspondent eFUSE
TBD	BOOT_MODE0	n/a
TBD	BOOT_MODE1	n/a
TBD	LCD1_DATA00	BOOT_CFG1[0]
TBD	LCD1_DATA01	BOOT_CFG1[1]
TBD	LCD1_DATA02	BOOT_CFG1[2]
TBD	LCD1_DATA03	BOOT_CFG1[3]
TBD	LCD1_DATA04	BOOT_CFG1[4]
TBD	LCD1_DATA05	BOOT_CFG1[5]
TBD	LCD1_DATA06	BOOT_CFG1[6]
TBD	LCD1_DATA07	BOOT_CFG1[7]
TBD	LCD1_DATA08	BOOT_CFG2[0]
TBD	LCD1_DATA09	BOOT_CFG2[1]
TBD	LCD1_DATA10	BOOT_CFG2[2]
TBD	LCD1_DATA11	BOOT_CFG2[3]
TBD	LCD1_DATA12	BOOT_CFG2[4]
TBD	LCD1_DATA13	BOOT_CFG2[5]
TBD	LCD1_DATA14	BOOT_CFG2[6]
TBD	LCD1_DATA15	BOOT_CFG2[7]
TBD	LCD1_DATA16	BOOT_CFG4[0]
TBD	LCD1_DATA17	BOOT_CFG4[1]
TBD	LCD1_DATA18	BOOT_CFG4[2]
TBD	LCD1_DATA19	BOOT_CFG4[3]
TBD	LCD1_DATA20	BOOT_CFG4[4]
TBD	LCD1_DATA21	BOOT_CFG4[5]
TBD	LCD1_DATA22	BOOT_CFG4[6]
TBD	LCD1_DATA23	BOOT_CFG4[7]

Low-power RTC example

This article deals with power consumption of AXELULite SOM. Power consumption in SNVS mode may be relatively high if:

• iMX6UL RTC is the only part that actually needs to be powered
• SNVS domain is powered by a limited-capacity energy storage device, such as coin cell Lithium battery or supercap.

In this case it is suggested to consider the use of an external low-power RTC instead. AXELULite adapter integrates such an RTC (ST M41T83). Please note that, when the system is powered off, SNVS domain is not powered at all because rechargeable coin cell is connected to external RTC only.

Documentation

• Schematics
• BOM
• Layout
• CAD Drawings

vedi http://davewiki.lan.dave.eu/wiki/index.php/Prodotti_-_DAVE_-_AXELULite_Adapter_%28XULADP%29