Infineon XC2000 Easy Kit, Руководство пользователя

Страница: 13 / 36

XC2000
Easy Kit
General Information about XC2000 Easy Kit Board
XC2000 series Board Manual 13 V 0.2, 2008-11
By means of the Power Supply Jumper X502, USB, or the external power Supply can be
selected to run the Easy Kit. The Setup for the Jumper X502 is shown in
Table 4 below.
The USB specification provides a 5 V supply on a single wire from which connected USB
devices may draw power. The specification provides for no more than 5.25 V and no less
than 4.35 V between the +ve and -ve bus power lines.
Initially, a device is only allowed to draw 100 mA. It may request more current from the
upstream device in units of 100 mA up to a maximum of 500 mA. In practice, most ports
will deliver the full 500 mA or more before shutting down power, even if the device hasn't
requested it or even identified itself. If a (compliant) device requires more power than is
available, then it cannot operate until the user changes the network (either by
rearranging USB connections or by adding external power) to supply the required power.
Note: If the USB power supply is not sufficient, an external power supply is needed and
the Jumper X502 setting need to be changed.
Note: In case the USB Host PC goes into Suspend Mode, an external Power Supply
should be used.
2.5.1 Power Supply via Power Plug
The XC2000 Board can be supplied either with USB cable or with an external power
supply. For external power supply a regulated DC power supply with
max. 12Volt/
400mA can be connected to the power connector. The maximum power dissipation of
the used voltage regulator has to be taken into account.
Table 4 Power Supply Jumper configuration
Name in
schematic Configuration Description
X502
Power Supply via USB Interface
(Default)
X502
Power Supply via Power Plug
1 2 3
2 3
1