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→Microcontroller-based application
* VIN is connected to main power supply (3.3V) that is used to power microcontroller too
* VIN_AUX is connected to an optional energy storage device as described in [[#Reliability|Reliability]] section.
====Embedded PC-based application====
The following pictures shows conceptual block diagram of application where the role of the host is played by an Embedded PC.
[[File:Dul-epc-scenario.png|thumb|center]]
In this case DUL D+/D- differential pair are connected to USB port of host. Please note that the 5V power rail of USB bus (VBUS according to USB nomenclature) is used to power DUL.
An optional LED is connected to LED_0 to provide user with status/activity signalling.
===Mechanical information===