Platform Power
Overview
Rev. 1
SmartHub Underdash OBC Hardware Guide
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6. Platform Power
Overview
The SmartHub Underdash power comes directly from the vehicle's 12V/24V DC battery and provides
intelligent power management options that reduce drain on the vehicle’s battery.
Super Capacitors
The SmartHub
Underdash has a super capacitor inside to:
Provide power backup if the main power source is disconnected.
Provide power backup during an ignition event (vehicle start up).
The SmartHub Underdash automatically manages power and super capacitor charging. The
operation time of the SmartHub Underdash while powered by the internal super capacitor is
dependent on the peripherals and applications being used. Nevertheless, the estimated time of
continued operation for standard applications is ~20 seconds.
The super capacitor will take approximately 20 minutes to charge when the device is first powered
on by the battery. After 20 minutes, the super capacitor should be fully charged and will provide up
to 20 seconds of backup power to the device.
When power is initially connected to the SmartHub Underdash, charging on the super capacitor
starts. The SmartHub Underdash may not power up immediate as the systems is waiting for the
super capacitor to reach a predetermined value. This initial charging could take up to 1min before
the power LED turns on. Power may be connected to the SmartHub Underdash at any time.
Device Power Consumption
Table 5:
SmartHub Underdash Current Consumption
SmartHub Underdash Current Consumption
Power OFF
Operational mode
12V
24V
~10mA
~7mA
250mA
130mA
