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Setting Up the AT91EB55 Evaluation Board
2.4
2.5
2.6
2.7
Jumper Settings
Powering Up the
Board
Measuring
Current
Consumption on
the
AT91M55800A
Testing the
AT91EB55
JP1 is used to boot on standard or user programs. For standard operations, set it in the
STD position.
JP8 is used to select the core power supply of the AT91M55800A. Operations at 2V are
not supported on the current silicon.
For more information about jumpers and other straps, see Appendix A.
2. The polarity of the power supply is not critical. The minimum voltage required is 7V.
Figure 2-2. 2.1 mm Socket
positive (+)
or
negative (-)
2.1 mm connector
The board has a voltage regulator providing +3.3V. The regulator allows the input volt-
age to be from 7 V to 12V. When you switch the power on, the red LED marked
“POWER” will light up. If it does not, switch off and check the power supply connections.
The battery BT1 provides a 3V power supply to the Advanced Power Management Con-
troller and the Real Time Clock (V DDBU ). In order to power up this module, the user must
first close the JP9 jumper.
The board is designed to generate the power for the AT91 product only through the
jumpers JP5 (V DDIO ), JP8 (V DDCORE ) and JP9 (V DDBU ). This feature enables measure-
ments to be made on the current consumption of the AT91 product. See Appendix A for
further details.
In order to test the AT91EB55 Evaluation board, the following procedure should be
performed:
Evaluation Board 1. Hold down the SW1 button and power up the board or generate a reset and wait
for the light sequence on each LED to complete. All the LEDs light once and the
D1 LED remains lit.
2. Release the SW1 button. The LEDs D1 to D7 light up in sequential order. If an
error is detected, all the LEDs will light up twice.
The LEDs represent the following devices:
! D1 for the internal SRAM
! D2 for the external SRAM
2-2
1709C–ATARM–28-Apr-05
AT91EB55 Evaluation Board User Guide
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