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<section begin="History" />{| style="border-collapse:collapse; "! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History|- ! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes|-| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |{{InfoBoxTopoldid|5205|2016/07/21}}| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |New documentation layout|-| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |{{AppliesToAXELULiteoldid|8793|2019/08/19}}{{InfoBoxBottom}| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Add information for power consumption figures|-! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |2020/10/15! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |Minor changes|}<section end="History" />__FORCETOC__<section begin="Body" /> ==IntroductionPower Supply Unit (PSU) and recommended power-up sequence ==
AXEL ULite system-on-module (SOM for short) is powered by carrier board via <code>VIN_SOM</code> rail.
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=== Power Supply Unit (PSU) and recommended power-up sequence ===
Implementing correct power-up sequence for i.MX6UL processors is not a trivial task because several power rails are involved. AXEL ULite SOM simplifies this task by embedding all the needed circuitry. The following picture shows a simplified block diagram of PSU/voltage monitoring circuitry:
* synchronizes the powering up of carrier board in order to prevent back power.
==== Power-up sequencesignals====
The typical power-up sequence is the following:
For further details, please refer to <ref name="PF3000">Freescale Semiconductor, ''PF3000 Advance Information - Power Management Integrated Circuit (PMIC) for i.MX 7 & i.MX 6SL/SX/UL''</ref>, <ref name="IMX6ULIEC">''Freescale Semiconductor, Data Sheet: Technical Data - i.MX 6UltraLite Applications Processors for Industrial Products''</ref>.
===References===
{{reflist}}
<section end="Body" />
