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Power supply unit (PSU) and voltage domains (SBC Lynx)

498 bytes added, 11:03, 25 November 2016
PSU structure and voltage domains organization
PMIC is in turn powered by a 2A DC/DC converter that is enabled by SXUB_ENA signal, available on [[Connectors,_buttons_and_switches_(SBC_Lynx)#CPU_ONOFF_.2F_Power_Reset_connector_.28J50.29|J50 connector]]. This signal is connected to VIN through a 100 kOhm resistor and to ground through a 56 kOhm resistor. As such, by default it enables DC/DC regulator when VIN is applied. Nevertheless, SXUB_ENA can be driven by external circuitry to turn the regulator off, even if VIN is the range 5 - 24V.
Two of the supplies generated by PMIC are available to power external devices or add-on boards.
[2] AUX_5V is generated by a 600mA boost DC/DC converter. As this converter powers USB devices connected to J47 and J48 - if any - and DWM WiFi/Bluetooth module (if populated), maximum current available at connector J54 can not be provided.
==Power sequencing==
In case additional circuitry has to interfaced to processor's I/Os [1], '''proper power sequencing should be implemented''' in order to avoid back power phenomena. To do that, AUX_3.3V should be used:

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