REva User Guide: Mother Board
3. REva mother board
3.3.3 Features
●
1 jack for the connection of auxiliary 9V power supply to power the REva board in broken apart
mode. Should you require one, the 9V power supply should output 9V DC and have a 2.1 x 5 mm
jack with the ground signal on the outside.
●
1 two-position jumper for configuring the
regulator input
. When the jumper is in the “Jack”
position, the regulator input is the external 9V power supply. When it is in the “USB” position, the
regulator input is the USB power supply of the embedded RLink.
●
1 two position jumper to select the
VDD source
. The (1) and (2) positions have a meaning that
depends on the connected daughter board (auto configuration of the power supply area by the
daughter board – refer to the daughter specific chapter in this documentation).
●
1 green LED which is lit when the REva board is powered.
3.3.4 Limitations
The USB 5V is actually 4.8V because a low drop out diode is connected between the USB connector
and the board, to protect the PC.
For accurate 5V power supply, use an external power supply
.
Once the RLink has been separated from the REva mother board
, the USB power supply is no
longer connected to the power supply area. The use of an external 9V DC power supply is mandatory,
the “Regulator Input” jumper must remain in the “Jack” position and the “VDD selection” jumper must
remain in the (1) position.
With 1.8V power supply, the LEDs on the board are dim and some features are not available (serial
communication, I²C EEPROM and temperature measurement).
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