GreenPAK Universal
Development Board
Silego Technology Inc.
www.silego.com
10/13/2014
3.2. Functional Description
3.2.1. Power Supply
Main power source of GreenPAK3 Universal Board is USB power lines. GreenPAK3
chip power supply range is 1.8-5.5 volts. The development board can provide power from 0 to
5.5V. To provide this power range the development board is enabled with a boost converter. A
Signal generator with a buffered output controls GreenPAK3 chip power rail. For more
information about GreenPAK3 electrical specification, please refer to the part datasheet.
3.2.2. USB Communication
The board has a USB communications interface that uses the USB mini-B connector, as
shown in Figure 3-2. This interface provides communication with software control tool and
supplies power to the board, as discussed in
Power Supply chapter.
Figure 3-2. USB Interface
3.2.3. GND connections
There are 6 GND pins on the left side, 6 pins and 1 header on the right side. These can
be used for test equipment (oscilloscope, multimeter etc.) ground reference connection or to
connect external test circuitry ground.
3.2.4. Pin test points
Each GreenPAK3 chip pin including VDD has its own observation test point. These test
points were designed only for observation, if you need to connect an external signal source,
use a software-controlled expansion connector.
3.2.5. LEDs
All the pins except Pin2 can be connected to buffered LEDs. This option allows you to
visualize digital levels on chip pins. There are 2 selection modes:
- Buffered LED (with high impedance input);
