Atmel AT91SAM7A3-EK User Manual

AT91SAM7A3-EK Evaluation Board

..............................................................................................

User Guide

Table of Contents

Section 1

Overview...............................................................................................1-1

1.1 Scope........................................................................................................1-1

1.2 Deliverables ..............................................................................................1-1

1.3 The AT91SAM7A3-EK Evaluation Board..................................................1-1

Section 2

Setting Up the AT91SAM7A3-EK Evaluation Board............................. 2-1

2.1 Electrostatic Warning ................................................................................2-1

2.2 Requirements............................................................................................2-1

2.3 Layout .......................................................................................................2-2

2.4 Powering Up the Board.............................................................................2-3

2.5 Backup Power Supply...............................................................................2-3

2.6 Getting Started..........................................................................................2-3

2.7 AT91SAM7A3-EK Block Diagram .............................................................2-4

Section 3

Board Description ................................................................................. 3-1

3.1 AT91SAM7A3 Microcontroller...................................................................3-1

3.2 AT91SAM7A3 Block Diagram ...................................................................3-4

3.3 Memory .....................................................................................................3-5

3.4 Clock Circuitry...........................................................................................3-5

3.5 Reset Circuitry ..........................................................................................3-5

3.6 Shutdown Controller .................................................................................3-5

3.7 Power Supply Circuitry..............................................................................3-5

3.8 Remote Communication ...........................................................................3-5

3.9 Analog Interface........................................................................................3-5

3.10 User Interface ...........................................................................................3-5

3.11 Debug Interface ........................................................................................3-6

3.12 Expansion Slot ..........................................................................................3-6

Section 4

Configuration Straps .............................................................................4-1

Section 5

Schematics ........................................................................................... 5-1

Section 6

Revision History....................................................................................6-1

AT91SAM7A3-EK Evaluation Board User Guide i

4.1 Configuration Straps .................................................................................4-1

5.1 Schematics ...............................................................................................5-1

6.1 Revision History ........................................................................................6-1

6165C–ATARM–26-Jun-06

Section 1
Overview

1.1 Scope The AT91SAM7A3-EK evaluation kit enables evaluation capabilities and code develop-

ment of applications running on an AT91SAM7A3.
This guide focuses on the AT91SAM7A3-EK board as an evaluation platform.

1.2 Deliverables The AT91SAM7A3-EK package contains the following items:

! an AT91SAM7A3-EK board

! one A/B-type USB cable

! one serial RS232 cable

! one DVD-ROM containing summary and full datasheets, datasheets with electrical

and mechanical characteristics, application notes and getting started documents for
all development boards and AT91 microcontrollers. An AT91 software package with C
and assembly listings is also provided. This allows the user to begin evaluating the
AT91 A R M

®

Thumb® 32-bit microcontroller quickly.

1.3 The
AT91SAM7A3-EK
Evaluation Board

AT91SAM7A3-EK Evaluation Board User Guide 1-1

The board is equipped with an AT91SAM7A3 (100-pin LQFP Green package) together
with the following:

! USB device port interface

! one DBGU serial communication port

! JTAG/ICE debug interface connector

! two serial CAN communication ports

! one serial LIN communication port

! one buffered analog input and PWM output

! one Power LED and four general-purpose LEDs

! one SD/MMC/DataFlash

! expansion connector

! one Atmel

! one footprint for 3.6V lithium thionyl-chloride backup battery

®

®

serial DataFlash

card slot

6165C–ATARM–26-Jun-06

Overview

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Section 2

Setting Up the AT91SAM7A3-EK

Evaluation Board

2.1 Electrostatic
Warning

The AT91SAM7A3-EK evaluation board is shipped in a protective anti-static package.
The board must not be subjected to high electrostatic potentials. A grounding strap or
similar protective device should be worn when handling the board. Avoid touching the
component pins or any other metallic element.

2.2 Requirements In order to set up the AT91SAM7A3-EK evaluation board, the following items are

required:

! the AT91SAM7A3-EK evaluation board itself

! an A/B-type USB cable

or
! a DC USB power adapter (5V at 0.5 A) with USB A/B cable

Note: The AT91SAM7A3-EK is not delivered with a JTAG/ICE interface which is

required to start evaluating the device.

AT91SAM7A3-EK Evaluation Board User Guide 2-1

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Setting Up the AT91SAM7A3-EK Evaluation Board

2.3 Layout

Figure 2-1. Top Level Layout

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Setting Up the AT91SAM7A3-EK Evaluation Board

2.4 Powering Up the

AT91SAM7A3 is self-powered by the USB port or by a USB power adapter.

Board

2.5 Backup Power
Supply

The user may add a battery (SAFT LS14250 3.6V or equivalent) in order to permanently
power the backup part of the device. In this case, the configuration of J16, S6 and S7
must be changed.

Refer to Table 4-1.

2.6 Getting Started The AT91SAM7A3-EK evaluation board is delivered with a DVD-ROM containing all

necessary information and step-by-step procedures for working with the most common
development tool chains. Please refer to this DVD-ROM, or to the Atmel web site,

http://www.atmel.com/products/AT91/, for the most up-to-date information on getting

started with the AT91SAM7A3-EK.
Note that the AT91SAM7A3 microcontroller fitted on the evaluation board has been pro-

grammed with the SAM Boot Assistant (SAM-BA
program the embedded Flash memory through the USB or DBGU communication
channel.

Programming through DBGU requires that the evaluation kit is powered using a Power
Supply USB Adapter

™

) which provides an easy way to

Note: The SAM-BA Boot Assistant resides in the embedded Flash memory and will be
deleted when programming the Flash. A JTAG/ICE interface is required to recover
SAM-BA Boot Assistant.

AT91SAM7A3-EK Evaluation Board User Guide 2-3

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Setting Up the AT91SAM7A3-EK Evaluation Board

2.7 AT91SAM7A3-EK
Block Diagram

Figure 2-2. Block Diagram

VBUS

S6S6

S7S7

IN OUT

3.3V

nSHUTDOWN

YELLOWYELLOW

PIO

LIGHTED WHEN POWER ON

J14J14

18.432 MHz

POWER LED

VDDPLL

J26J26

3V3

VDD1V8

SYSTEM CONTROLLER

XOUT

XIN

SHDN

VDDBU

J13J13

VDD3V3

FORCE WAKE-UP

NRST

WAKE-UP1

3V3

5V

NRST

BP2BP2

MANUAL RESET

JTAG/ICE

J5 J4 J3

CANL1CANH

TJA1050

CAN0

RS

CANL1CANH

3V3

5V

TJA1050

RS

CAN1

PIO

AT91SAM7A3-LQFP100

ADC

GNDANA

VDDANA

ADVREFP

ADC0_AD3

LIN

ATA6661

MN18

ADC0_AD2

1

USART0

DBGU
RS232

J2

TXD

RXD

ADM3202A

DRXD - DTXD

DBGU

PWM0..PWM7

USB DEVICE

1K51K5

DDP

PIO

SD/MMC

DATAFLASH (NPCS03)

ATMEL
SERIAL

DATAFLASH

CS

SPI0

PIO BEXT CLK INPUT

CARD READER

J7

8 57 6 4 3 2 1 9

MCI

VBUS

J1

DDM

USB

J9

PIO BPIO A

PIO A - PIO B EXPANSION CONNECTOR

3V3

R18 470RR18 470R

VDD BACKUP SELECT

R20

R20

3.6V

3.6V

3V6

3V6

NOT POPULATED

470R

470R

GNDANA

3

2

J16J16

1

BP3BP3

BP4BP4

JTAG/ICE CONNECTOR

3.3VANA

PWM2

PWM6

PWM7

PWM3

3
2
1

J17J17

3.00V +- 0.2%

EXTERNAL REF

0 TO VREF

0 TO VREF

EXTERNAL INPUT

PWM VOLTAGE GEN.

J8

1

J6

ANALOG INPUT

PWM0

DS1DS1 DS2DS2

DS3DS3

USER'S GREEN LED

DS4DS4

1

4
52

3 6

BP1BP1

USER'S TACT SWITCH

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