AT91EB42 datasheet(8/30 Pages) ATMEL

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Setting Up the AT91EB42 Evaluation Board

2-2

AT91EB42 Evaluation Board User Guide

2.4

Jumper Settings

JP1 is used to boot standard or user programs. For standard operations, set it in the

STD position.

JP8 is used to select the core power supply of the AT91M42800: 3.3V or 1.8V. For oper-

ation at 1.8V, MCK frequency shall be limited to 17 MHz.

For more information about jumpers and other straps, see Section 5.

2.5

Powering Up

the Board

DC power is supplied to the board via the 2.1 mm socket (J1) shown 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

A battery power supply can be connected to the board via the J3 connector. A battery

fast-charge controller is provided on-board to charge this battery.

The board has a voltage regulator providing +3.3V. The regulator allows the input volt-

age to range from 7

V to 9V. When you switch the power on, the red LED marked

POWER lights up. If it does not, switch off and check the power supply connections.

2.6

Measuring

Current

Consumption on

the AT91M42800

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

product, through the jumper JP5 (V

DDIO) and JP8 (VDDCORE). This feature enables mea-

surements to be made of the current consumption of the AT91 product.

See Section 5 for further details.

2.7

Testing the

AT91EB42

Evaluation Board

To test the AT91EB42 Evaluation Board, perform the following steps:

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

LED D1 remains lit.

Release the SW1 button. The LEDs D1 to D7 light up one after the other. If any

of the LEDs lights up twice, there is an error.

The LEDs represent the following components:

D1 for the internal RAM

D2 for the external RAM

D3 for the external Flash

D4 for the serial EEPROM

D5 for the SPI DataFlash

D6 for the EEPROM

D7 for the USART

D8 is reserved

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

restarts.

positive (+)

negative (-)

2.1 mm connector

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