Atmel STK526 Manuale utente

STK526 Rev. B

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

Hardware User Guide

STK526 rev. B Hardware User Guide 1

7709A–AVR–03/07

Section 1

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

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

1.2 STK526 - AT90USB82/162 Starter Kit Features.......................................1-4

Section 2

Using the STK526................................................................................. 2-6

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

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

2.3 RESET ....................................................................................................2-11

2.4 AT90USB82/162 AVR Microcontroller ....................................................2-12

2.5 Serial Links .............................................................................................2-12

2.6 On-board Resources...............................................................................2-16

2.7 STK500 Resources.................................................................................2-18

2.8 In-System Programming .........................................................................2-19

2.9 Debugging...............................................................................................2-23

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 ..................................................................... 4-28

Section 5

Technical Support............................................................................... 5-29

Section 6

Complete Schematics......................................................................... 6-30

STK526 rev. B Hardware User Guide 1-3

7709B–AVR–05/07

Section 1

Introduction

Congratulation for acquiring the AVR® STK526 - AT90USB82/162 Starter Kit. This kit is

designed to give designers a quick start to develop code on the AT90USB82/162 and

for prototyping and testing of new designs.

1.1 Overview

This document describes the STK526 dedicated to the AT90USB82/162 AVR

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

demonstration software. This documents applies to the revision B of the board.

To complement the evaluation and enable additional development capability, the

STK526 can be plugged into the Atmel STK500 Starter Kit Board in order to use the

AT90USB82/162 with advanced features such as variable VCC, variable XTAL, Parallel

Programming, 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, LEDs).

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

reference for advanced users.

Introduction

1-4 STK526 rev. B Hardware User Guide

7709B–AVR–05/07

Figure 1-1 . STK526 Board

1.2 STK526 - AT90USB82/162 Starter Kit Features

The STK526 rev. B provides the following features:

AT90USB82/162 TQFP device (2.7V<Vcc<5.5V),

AVR Studio® software interface

(1)

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

(2)

STK500 compatible (supports Parallel High-Voltage Programming)

Power supply flagged by “POWER-ON” LED:

– regulated 3.3 or 5V,

– from an external power connector,

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

– from STK500

(2)

– or using the 3.3V embedded regulator of AT90USB82/162

ISP connector :

– for on-chip ISP,

– for on-chip debugging using JTAG ICE and debugWire protocol,

Serial interfaces:

– 1 USB full speed device interface

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

On-board resources:

– 4-ways + 1-select joystick,

– 4 LEDs,

– serial 8Mo dataflash memory,

On-board RESET button,

Introduction

STK526 rev. B Hardware User Guide 1-5

7709B–AVR–05/07

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 STK526 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.

STK526 rev. B Hardware User Guide 2-6

7709B–AVR–05/07

Section 2

Using the STK526

This chapter describes the board and all its features.

2.1 Overview

Figure 2-1 . STK526 Overview

USB RS232

SPI /

debugWire

Power

Crystal

Joystick

Reset

Hardware

Boot

LEDs

Dataflash

Vcc

Source

3V3 Reg

Using the STK526

STK526 rev. B Hardware User Guide 2-7

7709B–AVR–05/07

EXT (JACK)

VBUS

STK500

3V3

AT90USBxx2

Vsource

(VCC SOURCE)



Internal

3V3 100mA

Regulator

(1) (2)

UVcc

Vcc

Ucap

NOREG INTREG

REG5V

REG3V3

VBUS

STK

(3V3 REG)

2.2 Power Supply

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

Because the AT90USB82/162 contains an internal 3V3 regulator that can be used to

power an external circuitry, several power configurations are handled by the STK526.

The power path is represented by the figure below :

Figure 2-2 . STK526 Power Configuration

First, the board allows to drain power from three external sources, leading to four

different solutions. The selected voltage is applied to the regulator input of the

AT90USB82/162. Then user can choose to power the MCU I/O either directly with the

primary power source (external 5V/3V3), or from the internal regulator itself (MCU auto-

power).

2.2.1 Power Supply Sources

The power supply can come from three different

(3)

sources:

USB connector,

JACK PWR connector (J5, See Figure 2-3),

STK500

USB powered: When used as a USB device bus powered application, the STK526 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.

Using the STK526

2-8 STK526 rev. B Hardware User Guide

7709B–AVR–05/07

Figure 2-3 . JACK PWR Connector (J6)

Figure 2-4 . Male JACK Outlet and Wires

STK500 Powered: (c.f.

“STK500 Resources” on page 18

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 STK526 “GND”. This could introduce some gap of voltage during

measurement and instrumentation.

3. Caution: Do not set more than one power supply source on STK526.

Using the STK526

STK526 rev. B Hardware User Guide 2-9

7709B–AVR–05/07

2.2.2 Power Source 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 VBUS

(4,8V to 5.2V)

This is the default configuration.

This should be used for a typical USB

device “bus powered” application.

In this mode, the STK526 is powered

directly from the USB bus, and no

other external power supply is

required.

REG 5V 5V

This configuration can be used for a

USB “self powered” device

application”.

To use this configuration an external

power supply must be connected to

J5 connector. The on-board 5V

regulator is used.

REG 3V3 3.3V

This configuration allows the STK526

to be used in a 3V range application.

To use this configuration an external

power supply must be connected to

J5 connector. The on-board 3V3

regulator is used.

STK

Depends on

STK500 VTG

setting

This configuration allows the STK526

to be used with an STK500 board.

In this mode, the STK526 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 STK526

2-10 STK526 rev. B Hardware User Guide

7709B–AVR–05/07

2.2.3 AT90USB82/162 Power Configuration Settings

This section applies to the following part of the power path diagram :

Figure 2-5 . MCU Power Configurations

Once the power source selected, the internal regulator input of the AT90USB82/162

(UVcc) is powered. Firmware has the responsability to enable or disable the regulator.

Ucap is the output pin of the internal regulator (decoupled with a 1µF capacitor), and

Vcc is the main power source of the MCU. Several cases may be required by the user :

Vsource = 5V, Vcc = 5V : in this mode, the configuration switch (see figure above)

must be in position serigraphied “NOREG”. The MCU can still run a USB Device

application if it enables the internal regulator that will power the USB pad and macro.

Vsource = 5V, Vcc = 3.3V : in this mode, the configuration switch must be in the

position serigraphied “INTREG”. The Vcc pin will be tied to the regulator output, so

that the AT90USB82/162 itself will power itself from its regulator, and the I/O will be

at 3V3 level.

Vsource = 3.3V, Vcc = 3.3V : in this mode all the MCU power inputs are at the 3V3

level. The configuration switch must be in the position “NOREG”. In normal operation

it is recommended to tie all the power pins together (UVcc, Vcc, Ucap) and to disable

the regulator. But the board configuration does not allow to tie together all the power

pins, so that the regulator must be enabled by firmware in order to power the USB

pad and macro (that can lead to some extra-consumption).

Table 2-2 . MCU Power Configuration Jumpers

AT90USBxx2

Vsource

)

Internal

3V3 100mA

Regulator

(1) (2)

UVcc

Vcc

Ucap

NOREG INTREG

(3V3 REG)

“3V3 REG”

Jumper position AT90USB16 I/O power supply Comments View

“NOREG” Primary power source This is the default configuration.

“INTREG” Internal regulator

This configuration is relevant with a

5V primary powered application

requiring I/O level at 3.3V on the

AT90USB82/162.

3V3 REG

NOREG

INTREG

3V3 REG

NOREG

INTREG

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