28301 Parallax Inc, 28301 Datasheet - Page 2

• Manufacturer Part Number: 28301
• Description: DAUGHTERBOARD 3PIN I/O MOBO
• Manufacturer: Parallax Inc

Specifications of 28301

• Accessory Type: Daughter Board, Power and I/O Interface
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MoBoStamp, MoBoProp
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Interface Connections and Jumpers
External Power Connector
The external power connector enables the connection of a filtered, unregulated 6-9VDC power supply to
power the motherboard. An example would be Parallax’s 7.5V wall transformer (#750-00009). If you will
be powering servos from this supply, use as low a power supply voltage as possible. This will help to
prevent the onboard 5V regulator from overheating.
+5V “On” LED
This LED comes on when the board’s +5V power level is active. When the board is powered externally,
this will occur whenever external power is applied. When the board is powered from the motherboard,
the LED will come on once the motherboard’s +5V becomes active.
Power Selection Header
This header, and the jumpers provided for it, serve two purposes:
The top row, labeled “DB 5V MB”, selects the +5V source. By jumpering DB to 5V, the board will be
powered from the onboard 5V regulator which, in turn, is powered from the external power connector. By
jumpering 5V to MB, the board’s +5V source is connected to the motherboard’s +5V power supply.
To enable the external power connector, jumper Vin to J1. You will also need to select external power on
your motherboard, rather than USB power, to power it from J1 as well. See your motherboard’s manual
© Parallax, Inc. • PWR-I/O-DB (2006.09.13)
Important: When operating servos or other noisy or high-current devices, it is strongly
recommended to use external power and not the motherboard’s +5V supply.
1. To select the source of the daughterboard’s +5V supply, and
2. To enable the external power connector.
"Power Good"
Connector
External
Power
LED
External Device Interface Headers
Power Selection Header
DB 5V MB
Vin J1
Motherboard
Connector
(on rear)
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