Atmel AT91SAM7A2-EK, User Manual

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2-2 AT91SAM7A2-EK Evaluation Board User Guide
6115B–ATARM–10-May-05
2.4 Voltage
DC power is supplied to the board via the 2.1 mm connector (J1) shown in Figure 2-2.
The polarity of the power supply is not critical. The minimum voltage required is 7V. The
supply must be isolated from ground. The 0 volts of the on-board regulated supplies can
be connected to ground via any one of the 4 test points, TP1 to TP4.
Figure 2-2. 2.1mm Connector
The board has a voltage regulator pro3.3V and another pro5V. These
regulators allow the input voltage to be from 7V to 12V.
2.5 Powering Up the
Board
Figure 2-3. Powering Up the Board
2.6 Measuring
Current
Consumption on
the AT91SAM7A2
The board is designed to generate the entire power supply of the AT91SAM7A2 device.
The PCB power tracks to the ARM7 core, the I/O and the analog cells are independent.
This feature enables measurement of the current consumption of the different major
parts of the AT91SAM7A2 device.
Positive (+) or
Negative(-)
Switch the
power on
The red LED marked
"DS1" lights up
Switch off, check the
fuse and the power
supply connections
No
End
Yes
Table 2-1. Current Consumption Measurement Procedure
Block to Measure Strap to Unsolder Action
Core E1
Connect an ammeter in place
of the strap
Analog Cells E2
I/O Cells E3