AT91EB55 datasheet(8/37 Pages) ATMEL

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Setting Up the AT91EB55 Evaluation Board

AT91EB55 Evaluation Board User Guide

2-2

2.4

Jumper Settings

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.

2.5

Powering Up the

Board

DC power is supplied to the board via the 2.1 mm socket (J1) shown below in Figure 2-

2. The polarity of the power supply is not critical. The minimum voltage required is 7V.

Figure 2-2. 2.1 mm Socket

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.

2.6

Measuring

Current

Consumption on

the

AT91M55800A

The board is designed to generate the power for the AT91 product only through the

jumpers JP5 (V

DDIO), JP8 (VDDCORE) and JP9 (VDDBU). This feature enables measure-

ments to be made on the current consumption of the AT91 product. See Appendix A for

further details.

2.7

Testing the

AT91EB55

Evaluation Board

In order to test the AT91EB55 Evaluation board, the following procedure should be

performed:

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.

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

D3 for the external Flash

D4 for the E

2PROM with I2C access

D5 for the SPI data flash

D6 for the SPI E

2PROM

D7 for the USART

D8 for the ADC and DAC

If a test is not carried out, the corresponding LED remains unlit and the test sequence

restarts.

2.1 mm connector

positive (+)

negative (-)

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