Atmel STK525 Manual de instalación

STK525

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

Hardware User Guide

STK525 Hardware User Guide User Guide 1

7608A–AVR–04/06

Section 1

Introduction...........................................................................................1-3

1.1 Overview...................................................................................................1-3

1.2 STK525 Starter Kit Features.....................................................................1-4

Section 2

Using the STK525.................................................................................2-6

2.1 Overview...................................................................................................2-6

2.2 Power Supply............................................................................................2-7

2.3 RESET....................................................................................................2-10

2.4 AT90USBxxx AVR Microcontroller..........................................................2-11

2.5 Serial Links .............................................................................................2-11

2.6 On-board Resources...............................................................................2-14

2.7 STK500 Resources.................................................................................2-19

2.8 In-System Programming .........................................................................2-20

2.10 Test Points..............................................................................................2-23

2.11 Configuration Pads .................................................................................2-24

2.12 Solder Pads ............................................................................................2-25

Section 3

Troubleshooting Guide .......................................................................3-26

Section 4

Technical Specifications .....................................................................4-27

Section 5

Technical Support...............................................................................5-28

Section 6

Complete Schematics.........................................................................6-29

STK525 Hardware User Guide 1-3

7608A–AVR–04/06

Section 1

Introduction

Congratulation for acquiring the AVR® STK525 Starter Kit. This kit is designed to give

designers a quick start to develop code on the AT90USBxxx and for prototyping and

testing of new designs.

1.1 Overview

This document describes the STK525 dedicated to the AT90USBxxx AVR

microcontroller. This board is designed to allow an easy evaluation of the product using

demonstration software.

To complement the evaluation and enable additional development capability, the

STK525 can be plugged into the Atmel STK500 Starter Kit Board in order to use the

AT90USBxxx with advanced features such as variable VCC, variable VRef, variable

XTAL, etc. and supports all AVR development tools.

To increase its demonstrative capabilities, this stand alone board has numerous on-

board resources (USB, RS232, joystick, data-flash, microphone and temperature

sensor).

This user guide acts as a general getting started guide as well as a complete technical

reference for advanced users.

Introduction

1-4 STK525 Hardware User Guide

7608A–AVR–04/06

Figure 1-1 . STK525 Board

1.2 STK525 Starter Kit Features

The STK525 provides the following features:



AT90USBxxx TQFP device (2.7V<Vcc<5.5V),



AVR Studio® software interface (1),



USB software interface for Device Firmware Upgrade (DFU bootloader) (2)



STK500 compatible



Power supply flagged by “VCC-ON” LED:

– regulated 3 or 5V,

– from an external power connector,

– from the USB interface (USB device bus powered application),

– from STK500 (2),



ISP connector for on-chip ISP,



JTAG connector:

– for on-chip ISP,

– for on-chip debugging using JTAG ICE,



Serial interfaces:

– 1 USB full/low speed device/host interface

– RS-232C ports with RTS/CTS handshake lines,



On-board resources:

– 4+1-ways joystick,

–4LEDs,

– temperature sensor,

– microphone,

– serial dataflash memory,

Introduction

STK525 Hardware User Guide 1-5

7608A–AVR–04/06



On-board RESET button,



On-board HWB button for force bootloader section execution at reset.



System clock:

– external clock from STK500 expand connectors

– 8 MHz crystal,



Numerous access points for test.

Notes: 1. The STK525 is supported by AVR Studio®, version 4.12SP2 or higher. For up-to-date

information on this and other AVR tool products, please consult our web site. The

newest version of AVR Studio®, AVR tools and this User Guide can be found in the

AVR section of the Atmel web site, http://www.atmel.com.

2. ATMEL Flip®, In System Programming Version 3 or Higher shall be used for Device

Firmware Upgrade. Please consult Atmel web site to retrieve the latest version of Flip

and the DFU bootloader Hex file if needed.

STK525 Hardware User Guide 2-6

7608A–AVR–04/06

Section 2

Using the STK525

This chapter describes the board and all its features.

2.1 Overview

Figure 2-1 . STK525 Overview

USB MiniAB RS232 JTAG ISP External Power

Joystick Potentiometer ResetCrystal Microphone

STK500 Expand0

STK500 Expand1

Data Flash

LEDS

Vcc Src.

Setting

TQFP64 Socket

Pin1

C Sensor

Vbus Gen.

Setting

Bootloader

Activation

Using the STK525

STK525 Hardware User Guide 2-7

7608A–AVR–04/06

2.2 Power Supply

The on-board power supply circuitry allows various power supply configurations.

2.2.1 Power Supply Sources

The power supply source can come from three different (3) and exclusive sources:



USB connector,



JACK PWR connector (J6, See Figure 2-2),



STK500

USB powered: When used as a USB device bus powered application, the STK525 can be powered via

the USB VBUS power supply line.

JACK PWR connector: – Need of a male JACK outlet,

– Input supply from 9 up to 15V (1) DC,

– No specific polarization (2) is required.

Figure 2-2 . JACK PWR Connector (J6)

Figure 2-3 . Male JACK Outlet and Wires

STK500 Powered: (c.f. “STK500 Resources” on page 19).

Notes: 1. 15V is the maximum level limitation of an unidirectional transit diode.

2. There is a diode (bridge) voltage level between the negative output of the power

supply and the STK525 “GND”. This could introduce some gap of voltage during

measurement and instrumentation.

3. Caution: Do not mount more than one power supply source on STK525.

Using the STK525

2-8 STK525 Hardware User Guide

7608A–AVR–04/06

2.2.2 Power Supply Setting

Table 2-1 . Power Supply(1) Setting

Notes: 1. Caution: The STK500 has its own “ON/OFF” switch

Vcc Source

Jumper position VCC power

supply value Comments View

VBUS 5 VBUS

(4,7V to 5.0V)

This is the default configuration.

This should be used for a typicalUSB

device “bus powered” application.

In this mode, the STK525 is powered

directly from the USB bus, and no

other external power supply is

required.

REG 5 5V

This configuration can be used for a

USB “self powered” device

application” or when operating has a

USB host.

To use this configuration an external

power supply must be connected to

J6 connector.

REG 3.3 3.3V

This configuration allows the STK525

to be used in a 3V range application.

This configuration can be used with

both device or host mode USB

applications.

To use this configuration an external

power supply must be connected to

J6 connector.

STK Depends on

STK500 VTG

setting

This configuration allows the STK525

to be used with an STK500 board.

In this mode, the STK525 power

supply is generated and configured

according to the “VTG” parameter of

the STK500 (1).

VCC

Source

Reg 5

Reg 3.3

VBUS 5

STK

VCC

Source

Reg 5

Reg 3.3

VBUS 5

STK

VCC

Source

Reg 5

Reg 3.3

VBUS 5

STK

VCC

Source

Reg 5

Reg 3.3

VBUS 5

STK

Using the STK525

STK525 Hardware User Guide 2-9

7608A–AVR–04/06

2.2.3 VBUS Generator Setting

When using the AT90USBxxx microcontroller in USB host mode. The STK525 should

provide a 5V power supply over the VBUS pin of its USB mini AB connector.

A couple of transistors on the STK525 allows the UVCON pin of the AT90USBxxx to

control the VBUS generation (See Figure 2-4). In this mode the STK525 is powered by

external power supply source (J6 or STK500 expand0/1 connectors). JP7 allows to

select the 5V source used by the VBUS generator.

Figure 2-4 . VBUS generator schematic

Table 2-2 . VBUS Generator Setting

FDV304P/FAI

R33

100k

VTG

STK

Ext

BC847B -

C34

4.7uF

JP7

VBUS gen R32

10k

UVCON

VBUS

“Vbus Gen”

Jumper position STK525 power supply Comments View

“Ext” External power supply from J6

This is the default configuration.

The VBUS generator source is the

on-board 5V regulator.

“Stk” External power supply from

Expand0/1 (connected to a STK500)

The VBUS generator source is the

STK500.

Note:

The “Vtarget” setting of STK500

should be set to “5V”.

Vbus

Gen

Ext

Stk

Vbus

Gen

Ext

Stk

Using the STK525

2-10 STK525 Hardware User Guide

7608A–AVR–04/06

2.2.4 “POWER-ON“ LED

The POWER-ON LED is always lit when power is applied to STK525 regardless of

power supply source and the regulation.

Figure 2-5 . “VCC-ON” LED

2.3 RESET

Although the AT90USBxxx has its on-chip RESET circuitry (c.f. AT90USBxxx

Datasheet, section “System Control and Reset), the STK525 provides the AT90USBxxx

a RESET signal which can come from 3 different sources:

2.3.1 Power-on RESET

The on-board RC network acts as power-on RESET.

2.3.2 RESET Push Button

By pressing the RESET push button on the STK525, a warm RESET of the

AT90USBxxx is performed.

Figure 2-6 . RESET Push Button (RST) Implementation

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