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AURA SOM/AURA Hardware/Power and Reset/Power Supply Unit (PSU) and recommended power-up sequence

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<section begin="Body" /> [[File:TBD.png | center | 400px]]
== Power Supply Unit (PSU) and recommended power-up sequence ==
Implementing correct power-up sequence for i.MX93 ''TBD: SOC ''' processors is not a trivial task because several power rails are involved.
AURA SOM simplifies this task by embedding all the needed circuitry. The following picture shows a simplified block diagram of PSU/voltage monitoring circuitry:
The PSU is composed of two main blocks:
* power management integrated circuit (PMIC)
* additional generic power management circuitry that completes PMIC functionalities
The PSU:
* generates the proper power-up sequence required by the SOC processor and surrounding memories and peripherals
* synchronizes the powering up of carrier board in order to prevent back power* provides some spare regulated voltages that can be used to power carrier board devices
=== Power-up sequence===
The typical power-up sequence is the following:
# VIN_SOM (+3.3V) main power supply rail is powered''TBD: descrizione dei segnali che intervengono nella PS'' ==== Note on BOARD_PGOOD usage ==== ''TBD: verificare le note sul BOARD_PGOOD'' # CPU_PORn (active-low) BOARD_PGOOD is driven low by PMIC; PMIC initiates power-up sequence needed by iMX93x processorgenerally used on carrier board to drive loads such as DC/DC enable inputs or switch on/off control signals. # SOM_PGOOD goes up when all CPU, memories and I/O power rail is ready# finally PMIC releases CPU_PORn; this signal bring Depending on the processor out kind of resetsuch loads, BOARD_PGOOD might not be able to drive them properly. In these cases a simple 2-input AND port can be used to address this issue. The following picture depicts a principle schematic showing this solution.
==== Note on SOM_PGOOD usage ====VDD_SOM denotes the power rail used to power AURA SoM.
SOM_PGOOD is generally used on carrier board to drive loads such as DC/DC enable inputs or switch on/off control signals[[File:AURA-power-good. png]]
Depending on the kind of such loads, SOM_PGOOD might not be able to drive them properly. On AURA SOM this signal is driven by a push-pull output at NVCC_3V3 rail, with max 20 mA current.
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[[Category:AURA]]
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