DEMO9RS08LA8 Freescale Semiconductor, DEMO9RS08LA8 Datasheet - Page 9

• Manufacturer Part Number: DEMO9RS08LA8
• Description: BOARD DEMO FOR MC9RSOLA8 MCU
• Manufacturer: Freescale Semiconductor
• Series: RS08r
• Type: MCUr

Specifications of DEMO9RS08LA8

• Contents: Board, Cable, DVD
• Silicon Manufacturer: Freescale
• Core Architecture: RS08
• Core Sub-architecture: RS08
• Silicon Core Number: MC9RS08
• Silicon Family Name: RS08LA
• Kit Contents: Board Cables CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: MC9RS08LA8
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

D E M O 9 R S 0 8 L A 8
U S E R
V_SEL
The V_SEL option header combines the V_SEL option header and the VDD_EN option header
into a single option block. This header allows the user to select power input either from any of
the various input sources. Removing the VDD_EN option header disconnects power from the
board peripherals leaving only the MCU powered. When the VDD_EN option jumper is
removed, the RST* and BGND option jumpers should also be removed, to ensure proper
operation. The figure below details the PWR_SEL header connections.
Figure 4: V_SEL Option Header
Power from the integrated BDM is drawn from the USB bus and is limited to 500 mA. This
current limit accounts for the total current supplied over the USB cable to the BDM circuit, the
target 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 +7V to +35V; however, input voltage should be limited
to prevent the voltage regulator (VR1) from overheating. VR1 provides a +3.3V fixed output
limited to 500mA. Over-temperature and over-current limit built into the voltage regulator
provides protection from excessive stress. The user should consider the maximum output
current limit of VR1 when attempting to power off-board circuitry through connector J1.
VX_EN
The VX_EN option header is a 2-pin jumper that connects or disconnects input J1-1 directly to
the target board voltage rail. J1-3 is directly connected to the ground plane. Use of this
feature requires a regulated input power source. This power input is decoupled to minimize
noise but is not regulated. Care should be exercised when using this feature; no protection 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
supplied 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.
G U I D E
V_SEL
• • VR1
• • VB
Selects power input from voltage regulator VR1
Selects power input from USB-BDM
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J A N U A R Y
2 3 ,
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