Atmel AT91EB40A, Руководство пользователя

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2-2 AT91EB40A Evaluation Board User Guide
2635C–ATARM–13-May-05
2.4 Jumper Settings
JP1 is used to boot standard or user programs. For standard operations, set it in the
STD position; for user programs, set it to the USER position.
CB2 is used to select the core power supply between 1.8V and 3.3V.
For more information on the CB2 setting, see “Configuration Straps” on page 5-1 in Sec-
tion 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
The board has a voltage regulator pro3.3V and 1.8V. The regulator allows the
input voltage to range from 7
V to 9V. When you switch the power on, the red LED D11
marked PWR lights up. If it does not, switch off and check the power supply
connections.
2.6 Measuring
Current
Consumption
on the
AT91R40008
The board is designed to generate the power for the AT91 product, and only the AT91
product, through the jumpers JP5A/JP5B (V
DDIO
) and JP7A/JP7B (V
DDCORE
). This fea-
ture enables the current consumption of the AT91 product to be measured.
See “Power Consumption Measurement Straps (JP5A/B, JP7A/B)” on page 5-3 in Sec-
tion 5 for further details.
positive (+)
or
negative (-)
2.1 mm Connector