Bus Power; Ac Power - MOTU MicroBook IIc User Manual

BUS POWER

Bus power requirements
When connected to a computer, the
MicroBook draws all the power it needs
from the USB HOST connection to the
computer. However, the USB connection
to the computer must meet all of the
requirements discussed below.
USB adapter products must be powered
If you are using a USB adapter or hub (a
third-party product that supplies one or
more USB ports to your computer), it
must have direct access to a power
supply:
PCI USB cards
■
connect the MicroBook to a PCI card and
run the MicroBook under bus power, the
PCI card must have a direct connection
to the power supply harness inside your
computer. This is the same power supply
harness to which you connect internal
hard drives, CD/DVD drives, etc.
PCMCIA, Cardbus or ExpressCard
■
slot adapters
— If you plan to connect
the MicroBook to a PC card, Cardbus or
ExpressCard USB adapter (inserted in
the card slot in your laptop), it must
provide a powered connection and it
must also have its own power supply.
Most commonly, these types of products
have a DC power adapter that plugs into
an AC wall outlet. As you can see,
however, this situation does not allow for
remote battery operation, as the card
adapter requires AC.
22
— If you plan to
Examples of bus- powered operation
Bus power from a desktop computer
Your desktop computer is running off of
its usual AC power connection, and the
MicroBook draws power from the USB
cable connected to the computer. There
are no limits to running time.
Bus power from an AC-powered laptop
This scenario is identical to the desktop
situation described above: the laptop is
powered by AC, the MicroBook is
powered via the USB bus and there are no
limits to running time.
Bus power from a battery-powered
laptop
The laptop is being powered by its own
battery, and the MicroBook is being
powered by its USB connection to the
computer, so the laptop battery is
supplying power to both the laptop and
the MicroBook. This is the most compact
and portable operating scenario.
Running time is determined by the
capacity of the laptop battery. Alternately,
you can power the MicroBook through
its Micro-B USB power port (see below).

AC POWER

As shown in Figure 4-6 on page 18, the
MicroBook IIc can be powered from a
wall outlet or other AC power source
using the supplied power adapter and a
Micro-B USB cable. This connection is
required when using the MicroBook with
iOS devices. This connection can be used
optionally to power the MicroBook when
it is connected to a battery-powered
laptop.
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