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AXELULite AXEL ULite adapter is a board that DAVE Embedded Systems has made available to make initial development on AXELULiteAXEL ULite-based systems easier.
The following sections illustrate in more detail what it integrates and how to use it.
AXELULite AXEL ULite adapter has to be interposed between the carrier board and AXELULite AXEL ULite SOM as shown by the following picture.
==Low-power Please note that, when the system is powered off nad the extarnal RTC example==is used, '''SNVS domain is not powered at all because rechargeable coin cell is connected to M41T83 only'''.
vedi http==Documentation==*Schematics://davewiki.lan.dave.eu/wiki/index.php/Prodotti_-_DAVE_-_AXELULite_Adapter_%28XULADP%29TBD*BOM: TBD*Layout: TBD*CAD Drawings: TBD
U0002 moved page AXELULite adapter to AXEL ULite adapter without leaving a redirect
==Introduction==
The following image shows a simplified block diagramsections illustrate in more detail what it integrates and how to use it.TBDIn principle it can be used with any carrier board designed to host 3.3V-powered AXEL ULite SOM. These SOMs have the ordering code in one of the [[Power (AXEL ULite)|following forms]]:*<code>DA p l r n c '''0''' t s</code>*<code>DA p l r n c '''1''' t s</code>*<code>DA p l r n c '''3''' t s</code>.
==Installation==
TBD
Once hardware boards have been assembled, <code>BOOT_MODE</code> and <code>BOOT_CFG</code> signals have to be configured in order to select the desired boot options.
==Boot configuration==
As described [[Boot_process_and_bootstrap_configuration_(AXELULiteAXEL ULite)|here]], ''GPIO ovverride'' mode is extremely helpful when it comes to easily select different boot configuration options. AXEL ULite adapter provides a bank of switches that allows to change both <code>BOOT_MODE</code> and <code>LCD1_DATAx</code> signals affecting boot configurations. When the switch is in ON position, "0" logic level is selected. The following tables list table lists all the switches related to boot configurationin detail.
{|class="wikitable" style="text-align: center;"
!Correspondent eFUSE
|-
| TBDS4.1||BOOT_MODE0|| n/a
|-
| TBDS4.2||BOOT_MODE1|| n/a
|-
| TBDS1.8||LCD1_DATA00|| BOOT_CFG1[0]
|-
| TBDS1.7||LCD1_DATA01|| BOOT_CFG1[1]
|-
| TBDS1.6||LCD1_DATA02|| BOOT_CFG1[2]
|-
| TBDS1.5||LCD1_DATA03|| BOOT_CFG1[3]
|-
| TBDS1.4||LCD1_DATA04|| BOOT_CFG1[4]
|-
| TBDS1.3||LCD1_DATA05|| BOOT_CFG1[5]
|-
| TBDS1.2||LCD1_DATA06|| BOOT_CFG1[6]
|-
| TBDS1.1||LCD1_DATA07|| BOOT_CFG1[7]
|-
| TBDS2.8||LCD1_DATA08|| BOOT_CFG2[0]
|-
| TBDS2.7||LCD1_DATA09|| BOOT_CFG2[1]
|-
| TBDS2.6||LCD1_DATA10|| BOOT_CFG2[2]
|-
| TBDS2.5||LCD1_DATA11|| BOOT_CFG2[3]
|-
| TBDS2.4||LCD1_DATA12|| BOOT_CFG2[4]
|-
| TBDS2.3||LCD1_DATA13|| BOOT_CFG2[5]
|-
| TBDS2.2||LCD1_DATA14|| BOOT_CFG2[6]
|-
| TBDS2.1||LCD1_DATA15|| BOOT_CFG2[7]
|-
| TBDS3.8||LCD1_DATA16|| BOOT_CFG4[0]
|-
| TBDS3.7||LCD1_DATA17|| BOOT_CFG4[1]
|-
| TBDS3.6||LCD1_DATA18|| BOOT_CFG4[2]
|-
| TBDS3.5||LCD1_DATA19|| BOOT_CFG4[3]
|-
| TBDS3.4||LCD1_DATA20|| BOOT_CFG4[4]
|-
| TBDS3.3||LCD1_DATA21|| BOOT_CFG4[5]
|-
| TBDS3.2||LCD1_DATA22|| BOOT_CFG4[6]
|-
| TBDS3.1||LCD1_DATA23|| BOOT_CFG4[7]
|}
==Low-power RTC example==
From the point of view of power status, AXEL ULite SOM can operate in [[Power consumption (AXEL ULite)|different modes]]. When operating in SNVS mode, power comnsumption 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.
AXEL ULite adapter integrates such an RTC (ST M41T83) that allows the user to compare this solution with respect to the one based on iMX6UL native RTC.
==Power consumption measurement circuit==
This circuit is based on [http://www.ti.com/product/INA226 Texas Instruments INA226] and it is used to measure power consumption of AXEL ULite SOM. This device is accessible via I2C bus either by iMX6UL itself [1] or by an external host connected to test points TP3 and TP4.
[1] Clearly this is not possible for all of the [[Power consumption (AXEL ULite)|iMX6UL operating modes]].
==I/O voltage sequencing and monitoring==
AXEL ULite SOM is powered by VIN_3V3 that, in turn, originates at carrier board level. VIN_3V3 is connected to the net VIN_SOM through a shunt resistor (R12) that is used by power measurement circuit.
The rest of the circuitry is powered by 3.3V rail that is turned on via U70 switch. This switch - enabled by the SOM_PGOOD signal - is used to implement proper power up sequence, as described [[Power (AXEL ULite)|here]].
A tiny microcontroller (U68) is used to implement a voltage monitoring circuit to verify that the difference between native AXEL ULite I/O voltage (SOM_3V3_IO) and 3.3V does not exceed 300mV, as per [[Power (AXEL ULite)#Introduction|design requirement]]. In case this condition is not met, the microcontroller triggers a full power up cycle via PMIC_PWRON.
