Difference between revisions of "AURA SOM/AURA Hardware/Power and Reset/Power Supply Unit (PSU) and recommended power-up sequence"
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== Power Supply Unit (PSU) and recommended power-up sequence == | == Power Supply Unit (PSU) and recommended power-up sequence == | ||
| − | Implementing correct power-up sequence for | + | Implementing correct power-up sequence for ''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: | AURA SOM simplifies this task by embedding all the needed circuitry. The following picture shows a simplified block diagram of PSU/voltage monitoring circuitry: | ||
| Line 20: | Line 22: | ||
The PSU is composed of two main blocks: | The PSU is composed of two main blocks: | ||
| − | * power management integrated circuit | + | * power management integrated circuit |
| − | * additional generic power management circuitry that completes PMIC functionalities | + | * additional generic power management circuitry that completes PMIC functionalities |
The PSU: | The PSU: | ||
| − | * generates the proper power-up sequence required by the | + | * generates the proper power-up sequence required by the SOC processor and surrounding memories and peripherals |
| − | * synchronizes the powering up of carrier board | + | * 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=== | === Power-up sequence=== | ||
| − | |||
| − | + | ''TBD: descrizione dei segnali che intervengono nella PS'' | |
| − | |||
| − | |||
| − | |||
| − | ==== Note on | + | ==== Note on BOARD_PGOOD usage ==== |
| − | + | ''TBD: verificare le note sul BOARD_PGOOD'' | |
| − | + | BOARD_PGOOD is generally used on carrier board to drive loads such as DC/DC enable inputs or switch on/off control signals. | |
| − | + | Depending on the kind of such 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. | |
| + | |||
| + | VDD_SOM denotes the power rail used to power AURA SoM. | ||
| + | |||
| + | [[File:AURA-power-good.png]] | ||
| + | |||
| + | |||
| + | <section end=Body/> | ||
| − | |||
[[Category:AURA]] | [[Category:AURA]] | ||
Revision as of 14:39, 2 February 2024
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Contents
Power Supply Unit (PSU) and recommended power-up sequence[edit | edit source]
Implementing correct power-up sequence for 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
- 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[edit | edit source]
TBD: descrizione dei segnali che intervengono nella PS
Note on BOARD_PGOOD usage[edit | edit source]
TBD: verificare le note sul BOARD_PGOOD
BOARD_PGOOD is generally used on carrier board to drive loads such as DC/DC enable inputs or switch on/off control signals.
Depending on the kind of such 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.
VDD_SOM denotes the power rail used to power AURA SoM.
