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D E M O 9 S 0 8 S H 8
U S E R G U I D E
A P R I L
2 7 ,
2 0 0 7
Figure 2: PWR_SEL Option Header
1
2
3
Selects power input from USB-BDM
PWR_SEL
1
2
3
Selects power input from on-board regulator or J1
PWR_SEL
NOTE: Set PWR_SEL jumper to VB during application development. Use barrel connector in-
put (PWR) to support LIN functionality if needed.
Power from the integrated BDM is drawn from the USB bus and is limited to 500 mA . This cur-
rent limit accounts for the total current supplied over the USB cable to the BDM circuit, the tar-
get board, and any connected circuitry. Current drain in excess of 500 mA will violate the USB
specification and will cause the USB bus to disconnect. This will cause the board to exhibit
power cycling where the board appears to turn-on then off continually. Damage to the host PC
or the target board may also result.
The on-board voltage regulator (VR1) accepts power input through a 2.0mm barrel connector
(PWR). Input voltage may range from +6V to +18V. The voltage regulator (VR1) provides a
+5V fixed output limited to 250mA. Over-temperature and over-current limit built into the volt-
age regulator provides protection from excessive stress. The user should consider the maxi-
mum output current limit of VR1 when attempting to power off-board circuitry through connec-
tor J1.
If powered from the PWR connector, the integrated BDM may still be used to develop and de-
bug application code. Alternately, the board may be powered from the integrated BDM while
the LIN bus is powered from the PWR connector.
VX_EN
The VX_EN option header is a 2-pin jumper that connects or disconnects input J1-1 directly to
the target board, +5V voltage rail. J1-3 is directly connected to the ground plane. Use of this
feature requires a regulated +5V input power source. This power input is decoupled to mini-
mize noise but is not regulated. Care should be exercised when using this feature; no protec-
tion is applied on this input and damage to the target board may result if over-driven. Also, do
not attempt to power the target board through this connector while also applying power through
the USB-Multilink BDM or the PWR connector; damage to the board may result.
Power may also be sourced to off-board circuitry through the J1 connector. The current sup-
plied from the USB bus or the on-board regulator limits current available to external circuitry.
Excessive current drain may damage the target board, the host PC USB hub, or the on-board
regulator. The figure below details the VX_EN header connections.
10
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