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{{AppliesToAxelLite}}
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{{ObsoleteWikiPage|link=AXEL_Lite_SOM/AXEL_Lite_Hardware}}
==Introduction==
===Axel Lite===
A spreadsheet is available for download at [[media:AxelLite-routing.zip|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 [[Power_(AxelLite)|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 <ref name="MMPF0100">NXP, ''MMPF0100 - PF0100 Data sheet: Advance Information''</ref>).
[[File:Axellite-rtc.png|thumb|center|600px|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 [[FAQs_(Axel)#Q:_How_to_enter_RTC_mode.3F|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.
==References==
{{reflist}}