Atmel AT90USBKey Manuale di installazione

AT90USBKey

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

Hardware User Guide

AT90USBKey Hardware User Guide User Guide 1

7627A–AVR–04/06

Section 1

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

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

1.2 AT90USBKey Features............................................................................1-4

Section 2

Using the AT90USBKey .......................................................................2-5

2.1 Overview...................................................................................................2-5

2.2 Power Supply............................................................................................2-6

2.3 Reset.........................................................................................................2-8

2.4 On-board Resources.................................................................................2-9

2.5 In-System Programming .........................................................................2-13

2.6 Debugging...............................................................................................2-14

Section 3

Troubleshooting Guide .......................................................................3-15

Section 4

Technical Specifications .....................................................................4-16

Section 5

Technical Support...............................................................................5-17

Section 6

Complete Schematics.........................................................................6-18

AT90USBKey Hardware User Guide 1-3

7627A–AVR–04/06

Section 1

Introduction

Congratulations on acquiring the AVR® AT90USBKey. This kit is designed to give

designers a quick start to develop code on the AVR® and for prototyping and testing of

new designs with the AT90USB microcontroller family.

1.1 Overview

This document describes the AT90USBKey dedicated to the AT90USB AVR

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

demonstration software.

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

board resources: USB, joystick, data-flash and temperature sensor.

Figure 1-1 . AT90USBKey

Introduction

1-4 AT90USBKey Hardware User Guide

7627A–AVR–04/06

1.2 AT90USBKey Features

The AT90USBKey provides the following features:



AT90USB QFN64



AVR Studio® software interface (1)



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



Power supply flagged by “VCC-ON” LED:

– regulated 3.3V

– from an external battery connector (for reduced host or OTG operation)

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



JTAG interface (connector not mounted):

– for on-chip ISP

– for on-chip debugging using JTAG ICE



Serial interfaces:

– 1 USB full/low speed device/host/OTG interface



On-board resources:

– 4+1-ways joystick

– 2 Bi-Color LEDs

– temperature sensor

– serial dataflash memories

– all microcontroller I/O ports access on 2x8pin headers (not mounted)



On-board RESET button



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



System clock:

– 8 MHz crystal

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

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

The most recent 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 latex version of Flip

and the DFU bootloader Hex file if needed.

AT90USBKey Hardware User Guide 2-5

7627A–AVR–04/06

Section 2

Using the AT90USBKey

This chapter describes the AVRUSBKey and all its resources.

2.1 Overview

Figure 2-1 . AT90USBKey Overview

Using the AT90USBKey

2-6 AT90USBKey Hardware User Guide

7627A–AVR–04/06

2.2 Power Supply

2.2.1 Power Supply Sources

The on-board power supply circuitry allows two power supply configurations:



from USB connector



from battery connector

USB powered When used as a USB device bus powered application, the AVRUSBKey can be directly

powered via the USB VBUS power supply line.

Battery powered The external battery connector should be used when the AT90USBKey is used as a

USB host. This mode allows the AT90USBKey to provide a 5V power supply from its

VBUS pin.

– Need of a female battery clip

– Input supply from 8 up to 15V DC (min. 100mA)

Figure 2-2 . Power supply schematic

VCC3

GND

2OUT 3

LM340

VBUS

VBAT

LL4148

C16

4.7uF

R19

124k 1%

U3out=1.25*(1+(R15+R18)/R19)

R18100k 1%

LL4148

C17

220nF

VCC3

R15

100k 1%

MTA

Ext power supply

C18

100nF

OUT 1

GND

OUT 4

FAULT 8

SHDN

CC 6

SET 5

LP3982 C15

33nF

LL4148

Using the AT90USBKey

AT90USBKey Hardware User Guide 2-7

7627A–AVR–04/06

2.2.2 VBUS Generator

When using the AT90USB microcontroller in USB host mode, the AT90USBKey should

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

A couple of transistors allows the UVCON pin of the AT90USB to control the VBUS

generation (See Figure 2-3). In this mode the AT90USBKey is powered by external

battery power supply source.

Figure 2-3 . VBUS generator schematic

2.2.3 “POWER-ON“ LED

The POWER-ON LED (“D1”) is always lit when power is applied to AVRUSBKey

regardless of the power supply source.

R25

100k

BC847B -

C19

4.7uF

R24

10k M1

FDV304P/FAI

UVCON

VBUS

Using the AT90USBKey

2-8 AT90USBKey Hardware User Guide

7627A–AVR–04/06

2.3 Reset

Although the AT90USB has its on-chip RESET circuitry (c.f. AT90USB Datasheet,

section “System Control and Reset), the AVRUSBKey provides to the AT90USB a

RESET signal witch can come from two different sources:

Figure 2-4 . Reset Implementation

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 AVRUSBKey, a warm RESET of the

AT90USB is performed.

2.3.3 Main Clock XTAL

To use the USB interface of the AT90USB, the clock source should always be a crystal

or external clock oscillator (the internal 8MHz RC oscillator can not be used to operate

with the USB interface). Only the following crystal frequency allows proper USB

operations: 2MHz, 4MHz, 6MHz, 8MHz, 12MHz, 16MHz. The AT90USBKey comes with

a default 8MHz crystal oscillator.

RST

VCC

47k C8

220nF RESET

Using the AT90USBKey

AT90USBKey Hardware User Guide 2-9

7627A–AVR–04/06

2.4 On-board Resources

2.4.1 USB

The AVRUSBKey is supplied with a standard USB mini A-B receptacle. The mini AB

receptacle allows to connect both a mini A plug or a mini B plug connectors.

Figure 2-5 . USB mini A-B Receptacle

When connected to a mini B plug, the AT90USB operates as an “USB device” (the ID

pin of the plug is unconnected) and when connected to a mini A plug, the AT90USB

operates as a “USB host” (the ID pin of the A plug is tied to ground).

2.4.2 Joystick

The 4+1 ways joystick offers an easy user interface implementation for a USB

application (it can emulate mouse movements, keyboard inputs...).

Pushing the push-button causes the corresponding signal to be pulled low, while

releasing (not pressed) causes an H.Z state on the signal. The user must enable

internal pull-ups on the microcontroller input pins, removing the need for an external

pull-up resistors on the push-button.

Figure 2-6 . Joystick Schematic

1uF

VBUS

R4 0

GND

VBUS

1-V_BUS

3-D+

2-D-

4-ID

5-GND

SHIELDSHIELDSHIELDSHIELD

USB_MiniAB

J3 VBUS

VBUS

GND

R3 22

R2 22

D+

D-

UID

CR1

CR2

UCAP

Select 5

Left 7

Up 3

Right 6

Down 4

Com1

Com2

SW3

TPA511G

PE[7..0]

PB[7..0]

PB5

PB6

PB7

PE4

PE5

Select 5

Left 7

Up 3

Right 6

Down 4

Com1

Com2

SW3

TPA511G

PE[7..0]

PB[7..0]

PB5

PB6

PB7

PE4

PE5

Select 5

Left 7

Up 3

Right 6

Down 4

Com1

Com2

SW3

TPA511G

PE[7..0]

PB[7..0]

PB5

PB6

PB7

PE4

PE5

Using the AT90USBKey

2-10 AT90USBKey Hardware User Guide

7627A–AVR–04/06

2.4.3 LEDs

The AT90USBKey includes 2 bi-color LEDs (green/red) implemented on one line. They

are connected to the high nibble of “Port D” of AT90USB (PORTD[4..7]).

To light on a LED, the corresponding port pin must drive a high level. To light off a LED,

the corresponding port pin must drive a low level.

Figure 2-7 . LEDs Implementation schematic

Table 2-1 . Leds references

2.4.4 Temperature Sensor

The temperature sensor uses a thermistor (R29), or temperature-sensitive resistor. This

thermistor have a negative temperature coefficient (NTC), meaning the resistance goes

up as temperature goes down. Of all passive temperature measurement sensors,

thermistors have the highest sensitivity (resistance change per degree of temperature

change). Thermistors do not have a linear temperature/resistance curve.

The voltage over the NTC can be found using the A/D converter (connected to channel

0). See the AT90USB Datasheet for how to use the ADC. The thermistor value (RT) is

calculate with the following expression:

Where: RT= Thermistor value (Ω) at Ttemperature (°Kelvin)

RH= Second resistor of the bridge -100 KΩ±10% at 25°C

VADC0 = Voltage value on ADC-0 input (V)

VCC = Board power supply

LED Reference AT90USB Connection Color

D2 PORTD.4 Red

PORTD.5 Green

D5 PORTD.6 Green

PORTD.7 Red

R141k

R171k

LEDs

In-line Grouped LEDs

PD4

PD5

PD7

PD[7..0]

PD6

R221k

R231k

RTRHVADC0

⋅()VCC VADC0

–

()⁄=

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