Difference between revisions of "AXEL Lite SOM/AXEL Lite Hardware/Power and Reset/Power Supply Unit (PSU) and recommended power-up sequence"
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Revision as of 09:44, 18 September 2020
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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.
AXEL Lite 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 AXEL Lite SoM.
