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LAVA Computer MFG Inc.
nLTS Product Family - Reference Manual – A04
2 Vulcan St. Toronto, ON Tel: +1 416 674-5942 www.lavasimulcharge.com
Canada, M9W 1L2
Toll Free (US & Canada): 800 241-5282
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Mobile Device Charging with USB Host Operation (SimulCharge)
Overview
The Lenovo mobile device was intended as a stand-alone device. When the mobile device
battery requires charging, it is plugged into a Wall/USB Charger to restore the battery charge.
The mobile device can continue being used while it is charging. Once the battery is charged, the
mobile device may use the charger as a supplementary power source if the mobile device is left
running. It is preferable to charge a mobile device with the unit off and remove the supply once a
full charge has been reached for the longest battery life.
When using a Lenovo Wall/USB Charger, the mobile device charges at a high rate that is mobile
device specific. The charge rate is also limited to the power available from the attached charger.
The Lenovo Wall/USB Chargers come in several power ratings, each matched to the original
mobile device requirements.
Charge-Only Mode
The Lenovo Wall/USB Charger is equivalent to a USB Charger with a Dedicated Charge Port
(DCP) as defined by the USB Battery Charging Specification R1.2.
The nLTS products use the term Charge-Only Mode to indicate the battery is being charged at
the highest rate permitted by the mobile device and is equivalent to a USB Charger with a
Dedicated Charge Port (DCP).
USB Host versus Accessory
A mobile device plugged into a desktop (or laptop) PC is treated as a USB Accessory (also
referred to as a USB Target). The PC operates as a USB Host Controller when the mobile device
is attached. The PC provides power to the mobile device, but the mobile device battery is being
charged at a low rate. In some cases, the battery may not charge.
To plug a USB Accessory into a mobile device, the mobile device must operate as a USB Host
Controller rather than a USB Accessory. The USB Standard has the On-The-Go (OTG) feature,
in which the mobile device detects that a USB Accessory has been plugged in and automatically
switches to operate as a USB Host Controller. Not all mobile devices support the USB OTG
feature. When operating as an OTG USB Host, the mobile device is expected to supply power to
the attached accessories, which means power is drained from the mobile device battery.