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ON/OFF
CONFIGURATION:
O
F
F
O
N
?
?
OFF – Input power source disconnected from upper voltage rail.
?
?
ON – Input power source connected to upper voltage rail
Figure 3: ON/OFF Switch
POWER SELECT
Configuration of applied input power is controlled using 2 option headers. The PWR_SEL
header selects between the on-board voltage regulator and the USB voltage input. The VX_EN
header connects J1-1 directly to the upper voltage rail. The illustrations below show the
different configuration for each option header.
PWR_SEL
Power from the integrated BDM is drawn from the USB bus and is limited to 500mA .
Excessive current drain will violate the USB specification causing the USB bus to disconnect.
CAUTION: Violating the USB specification will cause the USB bus to disconnect. This will cause the
board to reset.
The on-board voltage regulator (VR1) accepts power input through a 2.1mm barrel connector
(PWR). Input voltage may range from +5V to +15V. VR1 provides a +3.3V fixed voltage output
with output current limited to 800mA. Over-temperature and over-current limit built into the
voltage regulator provides limited protection from damage due to excessive stresses.
The user should consider the maximum output current of the selected power source when
attempting to power off-board circuitry through connector J1.
PWR_SEL
CONFIGURATION:
VB
VDD
?
?
?
Select power input from USB-BDM
PWR_SEL
VB
VDD
?
?
?
Select power input from VR1
Figure 4: PWR_SEL Option Header
VX_EN
The VX_EN option header is a 2-pin jumper that connects the target board voltage rail to J1-1.
J1-3 is connected directly to the ground plane. Use of this feature requires a regulated +3.3V
10
Freescale Semiconductor
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