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Powering Silicon Explorer II
Connecting Silicon Explorer
Powering Silicon Explorer II
SE II draws power from the external power supply (provided) or by connecting the VIO pin to a power source
(such as might exist on a PCB). You must connect VIO to a reference voltage when using the external
power supply. Microsemi recommends using the external power supply when the target system cannot
supply enough current to run SE II. The table below lists possible power configurations.
Table 2 · Power Configurations for Silicon Explorer II
2.5V
3.3V
5.0V
I/O Power Supply
External SE II Power Supply
Required
Optional (see note)
Optional
VIO
2.5V
3.3V
5.0V
Note: Note: If your current system is limited, you must use the external power supply and use VIO as the
reference voltage.
When you apply power, the yellow “heartbeat” LED on Silicon Explorer II begins to blink. Microsemi
designed Silicon Explorer II hardware to withstand abuse normally found in a lab environment. However,
long term exposure to out-of-range conditions can cause failure. In particular, long term connection to
reverse- or over-voltage power conditions can cause thermal failure.
Current Consumption
Silicon Explorer II is a CMOS device and exhibits very low current consumption when idle. Current
consumption rises rapidly to several hundred milliamps during acquisition. If your power supply is unable to
supply the necessary current, SE II or your target may reset. The table below is a guide to typical current
consumption based on an acquisition rate at 5V — current will be proportionately higher at 3V.
Table 3 · Typical Current Consumption
IDLE
10 MHZ
20 MHz
50 MHz
100 MHz
Acquisition Rate
75 mA
300 mA
400 mA
500 mA
700 mA
Current@5V
Connector Types
Silicon Explorer II has a 22-pin (18 channels, a clock, VIO, GND, and clock GND), a 26-pin, and a 16-pin
connector for controlling the Action Probe circuitry and reading the design checksum.
Table 4 · Connector Types
Silicon Explorer II User's Guide
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