AT91SAM7A2-EK Evaluation Board User Guide
3-1
6115B–ATARM–10-May-05
Section 3
Board Description
3.1
AT91SAM7A2-EK
Top Level
The AT91SAM7A2-EK evaluation board consists of 10 main blocks. Each block is
described in the sections that follow.
The block diagram is shown in Figure 2-4.
3.2
AT91SAM7A2
Processor
The processor is based on an ARM7TDMI
®
32-bit core and provides
!
Standard modules (e.g., timers and USART)
!
Specific modules (e.g., CAN2.0A, CAN2.0B)
The footprint is for a 176-pin TQFP package.
The jumpers E1, E2 and E3 can be removed to allow measurement of the current
required by the microcontroller.
3.3
Power Supply
Block
The voltage regulator provides 3.3V, 5V and analog 3.3V to the board and lights the red
LED when operating.
Power can be applied via the 2.1 mm connector to the regulator in either polarity
because of the diode rectifying circuit.
The regulators can tolerate supply transients up to 30V although they shut down without
damage if they overheat.
The I/O power is configurable. Jumper J3 allows the selection of either 3.3V or 5V. The
board also provides jumpers that measure the power of the microcontroller.
By unsoldering straps, an ammeter can be connected. Strap E1 is used to measure core
consumption. Strap E3 is used to measure I/O cell consumption; the analog cell con-
sumption is measured by jumper E2.
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