REva User Guide: Mother Board
3. REva mother board
3.5 Reset area
This area allows the reset of the devices on the daughter board.
3.5.1 Features
●
1 push-button with a negative polarity.
●
1 RC debouncing filter with a time constant of 330 us (soldered on the bottom side of the board).
3.5.2 Limitations
Microcontrollers using a positive reset signal require an inverter embedded on the daughter board.
3.6 Digital outputs area
This area is meant to provide the user with simple visible debug tools.
3.6.1 Features
●
8 red transistor-driven LEDs that light up when the command is low. Current is supplied by the
power supply (9V or USB) and not by the microcontroller's pads.
●
8 jumpers enabling
the
independent use of each LED. The use of a led is enabled when the
corresponding jumper is plugged in.
3.6.2 Limitations
When 1.8V power supply is used, the LEDs are dim.
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