ATMEL AT90USB User Manual

AT90USBKey

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

Hardware User Guide

Section 1

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

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

1.2 AT90USBKey Featu r e s............................................................................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 User Guide 1

7627A–AVR–04/06

1.1 Overview

Section 1

Introduction

Congratulations on acquiring the AVR® AT90USBKey. This kit is designed to give
designers a qui ck start to develop code on th e A VR ® and for prot oty ping and testing of
new designs with the AT90USB microcontroller family.

This document describes the AT90USBKey dedicated to the AT90USB AVR
microcontroller. This board is des ig ned to al low an eas y ev alu ation of t he product using
demonstration software.

To increase its demonstrative capabilities, this stand alone board has numerous on­board resources: USB, joystick, data-flash and temperature sensor.

Figure 1-1 . AT90USBKey

AT90USBKey Hardware User Guide 1-3

7627A–AVR–04/06

Introduction

1.2 AT90USBKey Features

The AT90USBKey provides the following features:



AT90USB QFN64



AVR Studio® software interface



USB software interface for Device Firmware Upgrade (DFU bootloader)



Power supply flagged by “VCC-ON” LED:



JTAG interface (connector not mounted):



Serial interfaces:



On-board resources:



On-board RESET button

(1)

(2)

– regulated 3.3V
– from an external battery connector (for reduced host or OTG operation)
– from the USB interface (USB device bus powered application)

– for on-chip ISP
– for on-chip debugging using JTAG ICE

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

– 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 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.

1-4 AT90USBKey Hardware User Guide

7627A–AVR–04/06

2.1 Overview

Section 2

Using the AT90USBKey

This chapter describes the AVRUSBKey and all its resources.

Figure 2-1 . AT90USBKey Overvi ew

AT90USBKey Hardware User Guide 2-5

7627A–AVR–04/06

Using the AT90USBKey

2.2 Power Supply

2.2.1 Power Supply Sources

USB powered When used as a US B devic e bus powered application, the AVRUSBKey can be direct ly

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

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



from USB connector



from battery connector

powered via the USB VBUS power supply line.

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 . P ower supply schematic

J8

2
1

MTA
Ext power supply

VBUS

D3

LL4148

D4
LL4148

D6

LL4148

5V

U4

2

IN

7

SHDN

3

GND

LP3982

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

-

C16

4.7uF

220nF
C17

OUT
OUT

FAULT

CC

SET

VBAT

1
4
8
6
5

33nF
C15

1
2

U5

IN
GND

LM340

OUT

100k 1%

R19
124k 1%

3

100nF
C18

VCC3

VCC3

R15

R18100k 1%

2-6 AT90USBKey Hardware User Guide

7627A–AVR–04/06

2.2.2 VBUS Generator

Using the AT90USBKey

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

FDV304P/FAI

UVCON

5V

R24

M1

10k

R25

Q1
BC847B

100k

-

C19

4.7uF

VBUS

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.

AT90USBKey Hardware User Guide 2-7

7627A–AVR–04/06

Using the AT90USBKey

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 Impleme n tatio n

VCC

2.3.1 Power-on RESET

2.3.2 RESET Push Button

2.3.3 Main Clock XTAL

R6
47k

RST

C8

220nF

RESET

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

By pressing the RESET push button on the AVRUSBKey, a warm RESET of the
AT90USB is performed.

To use the USB i nterface of the AT90USB, the clock s ource s hou ld a lways be a crystal
or external clock oscilla tor (the internal 8MHz RC oscilla tor can not be used to operate
with the USB interface). Only the following crystal frequency allows proper USB
operations: 2MHz, 4MHz, 6MHz, 8MH z, 1 2 MHz, 1 6 MHz. The AT90USBKey come s w ith
a default 8MHz crysta l os c illator.

2-8 AT90USBKey Hardware User Guide

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

J3

1-V_BUS

5-GND

USB_MiniAB

2-D-

3-D+

4-ID

SHIELDSHIELDSHIELDSHIELD

VBUS

CR1

VBUS

CR2

R2 22

R3 22

C7
1uF

R4 0

Using the AT90USBKey

D­D+
GND
UCAP

VBUS

GND

VBUS
UID

2.4.2 Joystick

When connecte d to a mini B plug, the AT90USB operates as an “US B device” (the ID
pin of the plug is unconnected) and when conne cted to a mini A plug, t he AT90USB
operates as a “USB host” (the ID pin of the A plug is tied to ground).

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 . J oystick Schematic

PB[7..0]

PB[7..0]

SW3

SW3

SW3

1

1

1
2

2

2

TPA511G

TPA511G

TPA511G

Com1

Com1

Com1
Com2

Com2

Com2

Select

Select

Select

Left

Left

Left

Up

Up

Up

Right

Right

Right

Down

Down

Down

PB5

PB5

PB5

5

5

5

PB6

PB6

PB6

7

7

7

PB7

PB7

PB7

3

3

3

PE4

PE4

PE4

6

6

6

PE5

PE5

PE5

4

4

4

PB[7..0]

PE[7..0]

PE[7..0]

PE[7..0]

AT90USBKey Hardware User Guide 2-9

7627A–AVR–04/06

Using the AT90USBKey

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

LEDs

D2

D5

Table 2-1 . Leds references

LED Reference AT90USB Connection Color

D2 PORTD.4 Red

D5 PORTD.6 Green

In-line Grouped LED s

R141k
R171k

R221k
R231k

PORTD.5 Green

PORTD.7 Red

PD4

PD5

PD6

PD7

PD[7..0]

2.4.4 Temperature Sensor

The temperature sensor uses a thermistor (R29), or temperature-sensitive resistor. This
thermistor have a negat ive t emperatu re c oefficient (NTC ), mea ning the resistance goes
up as temperature goes down. Of all passive temperature measurement sensors,
thermistors have the highest sensitivity (resistance cha nge per degree of temperat ure
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 therm istor value (R

T) is

calculate with the following expression:

R

RHV

T

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

⋅()VCC V

ADC0

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

R

ADC0 = Volt age value on ADC-0 input (V)

V
VCC = Board power supply

2-10 AT90USBKey Hardware User Guide

7627A–AVR–04/06

–

()⁄=

ADC0

Using the AT90USBKey

The NTC thermistor used in AT90USBKey has a resistance of 100 KΩ ±5% at 25°C (T0)
and a beta-value of 4250 ±3%. By the use of the following equation, the temperature (T)
can be calculated:

T

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

R

T

⎛⎞

ln

⎝⎠

-------

R

------+

T

0

β

0

β

-------------------------------=

ß = 4250 ±3%

0 = 100 KΩ ±5% at 25°C

R

0 = 298 °K (273 °K + 25 °K)

T

The following cross table also can be used. It is based on the above equation.
Table 2-2 . Thermistor Values versus Temperature

Temp.

(°C)

RT

(KΩ)

Temp.

(°C)

T

R

(KΩ)

Temp.

(°C)

T

R

(KΩ)

Temp.

(°C)

(KΩ)

-20 1263,757 10 212,958 40 50,486 70 15,396

-19 1182,881 11 201,989 41 48,350 71 14,851

-18 1107,756 12 191,657 42 46,316 72 14,329

-17 1037,934 13 181,920 43 44,380 73 13,828

-16 973,006 14 172,740 44 42,537 74 13,347

-15 912,596 15 164,083 45 40,781 75 12,885

-14 856,361 16 155,914 46 39,107 76 12,442

-13 803,984 17 148,205 47 37,513 77 12,017

-12 755,175 18 140,926 48 35,992 78 11,608

-11 709,669 19 134,051 49 34,542 79 11,215

-10 667,221 20 127,555 50 33,159 80 10,838

-9 627,604 21 121,414 51 31,840 81 10,476

-8 590,613 22 115,608 52 30,580 82 10,128

-7 556,056 23 110,116 53 29,378 83 9,793

-6 523,757 24 104,919 54 28,229 84 9,471

-5 493,555 25 100,000 55 27,133 85 9,161

T

R

-4 465,300 26 95,342 56 26,085 86 8,863

-3 438,854 27 90,930 57 25,084 87 8,576

-2 414,089 28 86,750 58 24,126 88 8,300

-1 390,890 29 82,787 59 23,211 89 8,035
0 369,145 30 79,030 60 22,336 90 7,779
1 348,757 31 75,466 61 21,498 91 7,533
2 329,630 32 72,085 62 20,697 92 7,296
3 311,680 33 68,876 63 19,930 93 7,067
4 294,826 34 65,830 64 19,196 94 6,847

AT90USBKey Hardware User Guide 2-11

7627A–AVR–04/06

Using the AT90USBKey

2.4.5 Data Flash memory

Temp.

(°C)

R

T

(KΩ)

Temp.

(°C)

T

R

(KΩ)

Temp.

(°C)

T

R

(KΩ)

Temp.

(°C)

T

R

(KΩ)

5 278,995 35 62,937 65 18,493 95 6,635
6 264,119 36 60,188 66 17,820 96 6,430
7 250,134 37 57,576 67 17,174 97 6,233
8 236,981 38 55,093 68 16,556 98 6,043
9 224,606 39 52,732 69 15,964 99 5,860

Figure 2-8 . Thermistor Schematic

PF[7..0]

VCC

PF0

R27
100k

R29

For mass-stora g e cla ss dem onstration purp o se , th e AT90 USBKe y p r o vides two on-chip
serial Flash memories (AT45DB642D) connected to the AT90 USB Serial Port Interface
(SPI).

PB[7..0]

VCC3

PE0
PB1
PB2
PB3

RESET

R9
100k

The data-flash chip select signals are connected to PortE bit 0 and bit 1 of the AT90USB
(See Figure 2-9).

Figure 2-9 . On-board data flash schematic

VCC3

R10

U2

1

SI

2

SCK

3

RESET

4

CS

AT45DB642D C ASON 8

SO

GND

VCC

WP

VCC3

8
7
6
5

R11
100k

PE1
PB1
PB2
PB3

RESET

100k

U3

1

SI

2

SCK

3

RESET

4

CS

AT45DB642D C ASON 8

SO

GND

VCC

WP

VCC3

8
7
6
5

R12
100k

2-12 AT90USBKey Hardware User Guide

7627A–AVR–04/06

2.5 In-System Programming

2.5.1 Programming with USB bootloader: DFU (Devi ce Firmware Upgrade)

AT90USB part comes with a default factory pre-programmed USB bootloader located in
the on-chip boot section of the AT90USB. This is the easiest and fastest way to
reprogram the device directly over the USB interface. The “Flip” PC side application, is
available from the Atmel website, offers a flexible an user friendly interface to reprogram
the application over the USB bus.

The HWB pin of the AT90USB allows to force the bootloader section execution after
reset. (Refer to AT90USB datasheet section “boot loa der support”). To force bootloader
execution, operate as follow:



Press both “RST” and “HWB” push buttons



First release the “RST” push button



Release the “HWB” push button

For more information about the USB bootloader and “Flip” application, please refer to
the “USB bootloader datasheet document” and “Flip’s user manual”.

Using the AT90USBKey

Note: The HWB pin is active only if the HWBE fuse is set (def ault factory conf iguration).

2.5.2 Programming with A VR JTAGI CEmKII

The AT90USB can be programmed using specific JTAG link. To use the AVR
JTAGICEmkII with an AT90USBKey an optional HE10 connector should be soldered to
J9 footprint. Then the JTAG probe c an be con nected t o the AT90USBKey as shown in

Figure 2-10.

Note: When the JTAGEN Fuse is unprogrammed, the four TAP pins are normal port pins, and

the TAP controller is in reset. When programmed, the input TAP signals are internally
pulled high and the JTAG is enabled for Boundary-scan and programming. The
AT90USB device is shipped with this fuse programmed.

AT90USBKey Hardware User Guide 2-13

7627A–AVR–04/06

Using the AT90USBKey

Figure 2-10 . Connecting AVR JTAG ICE to AVRUSBKey

The Flash, EEPROM and all Fuse and Lock Bit options ISP-programmable can be
programmed individually or with the sequential automatic programming option.

Note: See AVR Studio® on-line Help for informati on.

2.6 Debugging

2.6.1 Debugging with AVR JTAG ICE mkII

The AT90USBKey can be used for debugging with JTAG ICE MK II.
Connect the JTAG ICE mkII as shown in Figure 2-10, for debugging, please refer to

AVR Studio® Help information.
When using JTAG ICE MK II for debugging, and as AT90USB parts are factory

configured with the higher security level set, a chip erase operation will be performed on
the part before debugging. Thus the on-ch ip flash bootloader will be erased. It can be
restored after the debug session using the bootloader hex file available from ATM EL
website.

2-14 AT90USBKey Hardware User Guide

7627A–AVR–04/06

Troubleshooting Guide

Figure 3-1 . Troubleshooting Guide

Problem Reason Solution

The Green “VCC-ON”
LED is not on

No power supply

AVRUSBKey does not
work

Section 3

Verify the power supply source (check
battery char ge or USB connection).

The A T90USB cannot be
programmed

AVR Studi o does not
detect the AVR JTAG
ICE.

The A V R JTAG ICE
probe is not
connected

The memory lock bits
are programmed

The fuse bits are
wrongly programmed

Can not connect to
USB bootloader

Serial/USB cable is
not connected, or
power is off

PC COM port is in
use

Connect the JTAG ICE 10-PIN header to
the correct AVRUSBKey JTAG header
(page 13)

Erase the memory before programming
with JTAG ICE.

Check the fuse bits with JTAG ICE

Force bootloader execution with HWB
under reset.

USB bootloader erased after a JTAG
debugging session: reprogram the USB
bootloader with JTAG.

Connect seri al cable to RS232 (STK5 00 ­AVR ISP) and check power connect ions

Connect serial cable to USB (JATG ICE
MKII, AVR ISPmkIIl) and chec k power
connections

Disable other programs that are using
PC COM port.

Change PC COM port

AVR Studio does not
detect COM port.

AT90USBKey Hardware User Guide 3-15

Disable COM port auto-detect ion in AVR
St udio file menu. Force COM port to
correct COM port

7627A–AVR–04/06

Section 4

Technical Specifications



System Unit

– Physical Dimensions .....................................................L=90 x W=30 x H=8 mm

– Weight...........................................................................................................12 g



Operating Conditions

– Internal Voltage Supply .... ...........................................................................3.3V

– External Voltage Supply .........................................................................8V -15V



Connections

– USB Connector......................................................................Mini AB receptacle

– USB Communications .......................................................Full speed/low speed

– JTAG Connector....................................................Footprint for HE10 connector

– All ports connectors.............................................................J1, J2, J4, J5, J6, J7

– Battery connector....................................................................... MTA right angle

AT90USBKey Hardware User Guide 4-16

7627A–AVR–04/06

Section 5

Technical Support

For Technical support, please contact [e-mail]. When requesting technical
support, please include the following information:



Which target AVR device is used (complete part number)



Target vo ltage and speed



Clock source and fuse setting of the AVR



Programming method (ISP, JTAG or spec ific Boot-Loader)



Hardware revisions of the AVR tools, found on the PCB



Version number of AVR Studio. This can be found in the AVR Studio help menu.



PC operating system and version/build



PC processor type and speed



A detailed description of the problem

AT90USBKey Hardware User Guide 5-17

7627A–AVR–04/06

Section 6

Complete Schematics

On the next pages, the following documents of AT90USBKey are shown:



Complete schematics,



Bill of materials .

AT90USBKey Hardware User Guide 6-18

7627A–AVR–04/06

Figure 6-1 . Schematics, 1 of 2

Complete Schematics

Title

VCC

1

1

3

2

4

2

1

1

3

2

4

2

1.0.0

<Doc>

CPU

A4

Size Docum ent N um ber Rev

(not mounted)

1.27 mm D ual

H1.27-10

(not mounted)

1.27 mm D ual

H1.27-10

of

12Monday, J anuary 09, 2006

Date: Sheet

PE2

C9

220nF

C0603

PD[7..0]

C1

100nF

C0603

VCC

DECOUPLING CAPACITORS

CLOSED TO THE DEVI C E

MCU Pin52

C6

100nF

C0603

VCC

DECOUPLING CAPACITORS

CLOSED TO THE DEVI C E

MCU Pin21

C5

100nF

C0603

VCC

DECOUPLING CAPACITORS

CLOSED TO THE DEVI C E

MCU Pin3

VCC

PD7

PD5

PD3

PD1

3

5

7

9

5

7

9

6

8

10

J4

4

6

8

10

PD0

PD2

PD4

PD6

1

1

3

2

4

2

PC[7..0]

PC1

9

(not mounted)

1.27 mm D ual

H1.27-10

J5

10

PC0

R7

47k

VCC

PC7

PC5

PC3

(not mounted)

1

3

5

7

1

3

5

7

R0603

9

2

4

6

8

10

1.27 mm D ual

H1.27-10

2

4

6

8

PC2

PC4

PC6

C0603

R6

C8

47k

220nF

RESET

R0603

RESET

HWB

HWB

DTSM-3

Bootloader Activation

DTSM-3

A90USB Key

VCC

PE[7..0]

VCC

C0603

GND

PA3

PA4

PA5

PA6

PA7

PE2

PC7

PC6

PC5

PC4

PC3

PC2

PC1

42

43

48

PE2

PA744PA645PA546PA447PA3

PA2

49

PA2
PA1
PA0

PF7
PF6
PF5
PF4
PF3
PF2
PF1
PF0

AVCC

PA1

50

PA0

51

VCC

52

GND

53

PF7

54

PF6

55

PF5

56

PF4

57

PF3

58

PF2

59

PF1

60

PF0

61

AREF

62

GND

63
64

GND

AVCC

PE72UVcc3D-4D+5UGND6UCAP7VBUS8PE39PB010PB111PB212PB313PB414PB515PB6

PE6

AT90USB128U1QFN64

QFN64

1

PE6PE6

UVCON PE7

D-

UVCC

PB0

PB1

PB2

PB3

VBUS

D+

UID PE3

UCAP

PE7

PE5

PE3

PE1

1

3

5

7

9

1

3

5

7

9

2

4

6

8

10

J2

10

PE0

1.27 mm D ual

2

4

6

8

PE2

PE4

PE6

PF[7..0]

VCC

PF7

PF5

PF3

PF1

1

3

5

7

9

1

3

5

7

9

2

4

6

8

10

J1

10

PF0

1.27 mm D ual

2

4

6

8

PF2

PF4

PF6

PA[7..0]

(not mounted)

H1.27-10

PA[7..0]PA[7..0]PA[7..0]

PA[7..0]PA[7..0]PA[7..0]

VCC

(not mounted)

AGND

AREF

H1.27-10

C4

100nF

AREF

PF[7..0]

GND

VCC

UVCON

R2 22

R0603

C3

100nF

C0603

R1 0

VCC AVCC

C2

100nF

C0603

Ferrite & c apac it ors

closed t o t he MCU

VBUS

<ASSEMBLY>J3

D+ D- R ESI STORS

Closed t o t he MCU

VBUS

1-V_BUS

R0603

VBUS

UCAP

C7

1uF

C3216-A

R0603

R3 22

CR2

UGND UGNDUGNDUGNDUGND

2-D-

3-D+

5-GND

CR1

4-ID

SHIELDSHIELDSHIELDSHIELD

USB_MiniABF

MINI_USBC

PC0

PE1

34

PC035PC136PC237PC338PC439PC540PC641PC7

PB4

PB5

PGB0010603 R0603

PGB0010603 R0603

PE0

16

PB6

PC[7..0]

PC[7..0]

PD[7..0]

PE033PE1

PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
XTAL1
XTAL2
GND
VCC
RESET
PE5
PE4
PB7

PD[7..0]

32

PD7

31

PD6

30

PD5

29

PD4

28

PD3

27

PD2

26

PD1

25

PD0

24

XTAL1

23

XTAL2

22
21
20
19
18
17

PE5

PE4

RESET

VCC

PB7

PB[7..0]PB[7..0]

UGND

R0603

R4 0

UCAP C apac it or

PB[7..0]

PE[7..0]

Closed t o t he MCU

R0603

R5 0

UGND

AGND

RST

RST

Reset Circuit

PA[7..0]

VCC

PA7

PA5

PA3

XTAL1

XTAL2

C11

15pF

C0603

8MHz

49US

Y1 8MHz CRY STAL

C10

15pF

C0603

PA1

3

5

7

9

5

7

9

6

8

10

J7

4

6

8

10

PA0

PA2

PA4

PA6

PB[7..0]

VCC

PB7

PB5

PB3

PB1

3

5

7

9

5

7

9

6

8

10

J6

4

6

8

10

PB0

PB2

PB4

PB6

R0603

R8 0

RESISTORS

CLOSED TO THE DEVI C E

AT90USBKey Hardware User Guide 6-19

7627A–AVR–04/06

Complete Schematics

Figure 6-2 . Schematics, 2 of 2

VCC3

UCAP

VCC

4

7

R15

8

OUT

SHDN

R16

100k 1%

6

5

CC

FAULT

3

LL4148

SET

VCC

R20
0

D4

R18100k 1%

C15

33nF

LP3982

LL4148

R21
0

0

5V

R19

124k 1%

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

VCC3

D1

TOPLED LP M676

POWER LED(RED)

VCC

VCC

DECOUPLING CAPACITOR

CLOSE TO THE DEVIC E

C13

VCC3

C14

100nF

4.7uF

R13

1k

When mounting R21:

R20 not mounted

U4 not mounted

Allows to generate 3.3V

from U1 internal regulator

CAUTION: R21 default not mounted !!!

-

U4

D3

1

OUT

IN2GND

5V

VBUS

VCC3

U3

R12

100k

6

8

7

SO

GND

SI1SCK2RESET3CS

5

WP

VCC

AT45DB642D CASON 8

4

VBUS

FDV304P/FAI

M1

!!! R21 not mounted

R24

10k

C18

100nF

3

OUT

U5

IN1GND

LM340

2

VBAT

C17

220nF

C16

-

D6

LL4148

4.7uF

C19

4.7uF

-

of

22Saturday , F ebruary 18, 2006

Q1

BC847B

R25

100k

UVCON

VBUS generator f or OTG/HOST mode

1F <Cap Vbus < 6F OTG Specif ic at ion

VBAT

R28

VBat Mon.

220k

PF3
PF0

R27

VCC

Temp Sensor

100k

A90USB Key

<Doc> 1.0.0

Power & Interf ac es

A4

Title

Size D oc um ent N um ber Rev

Date: Sheet

R30

100k

R29

NCP18WF104J03RB

R10

VCC3

DECOUPLING CAPACITOR

CLOSE TO THE DEVIC E

C12

100nF

VCC3

Data Flash

PB[7..0]

VCC3

R9

100k

100k

VCC3

PE0

PE1

U2

PB1

PB1

PB3

PB2

R11

100k

6

7

8

SO

GND

SI1SCK2RESET3CS

PB3

PB2

RESET

5

VCC

4

RESET

WP

1

2

J8

PD[7..0]

PD4

AT45DB642D CASON 8

PD5

R141k

R171k

In-line Grouped LEDs

D2

PD7

PD6

R221k

R231k

D5

LEDs

MTA

PB[7..0]

PB5

5

SW3

Ext power supply

PB6

PE4

PB7

6

7

3

Up

Left

Select

Joystick Interface

Right

PE5

4

Down

PE[7..0]

Com11Com2

2

PF[7..0]

JTAG Interface

DECOUPLING CAPACITOR

R26

VCC

TPA511G

C20

100nF

VCC

RESET

8

4

6

2

CLOSE TO THE CONN EC TOR

J9

0

PF[7..0]

10

n.c.

VCC

GND

GND

RESET

CON 2x5

2.54 mm JTAG CON

TDI

9

PF7

CON 2x5

(not mounted)

TCK

TDO

TMS

VCC

1

3

5

7

PF4PF4

PF6

PF5PF5

6-20 AT90USBKey Hardware User Guide

7627A–AVR–04/06

Table 6-1 . Bill of material

Complete Schematics

Item Q.ty Reference Part

1 2 CR1,CR2 ESD protection (PGB0010603)
2 10 C1,C2,C3,C4,C5,C6,C12,

C13, C 18, C20
3 1 C7 1uF 10Vmin ±10% EIA/IECQ 3216
4 3 C8,C9, C17 220nF 50V-10% Cera m i c C ASE 0603
5 2 C10, C11 15pF 50V-5% Ceramic CASE 0603
6 3 C14, C16, C19 4.7uF 10Vmin ±10% EIA/IECQ 3216
7 1 C15 33nF 50V-5% Ceramic CASE 0603
8 2 D2,D5 LED BI-COLOUR/ LSGT670 I=10 mA_ PLCC-4
9 1 D1 TOPLED / LP M 6 76 - K2M 1 I=10 mA_ PLCC-2

10 2 D3,D4 DII LL4148-7 i=200mA max LL-34
11 1 J3 USB mini AB receptacle Surface mount
12 0 J9 CO N 2x 5 ( 2.5 4m m )
13 0 J1,J2,J4,J5 ,J6,J7 1.27 mm Dual header
14 1 J8 Connector MTA 2 cts right ang le
15 1 M1 FDV304P/FAI SOT23
16 1 Q1 BC847B IC peak=200mA SOT23
17 2 R2,R3 22 1/16W-5% SMD CASE 0603
18 1 R5 68k 1/16W-5% SMD CASE 0603
19 2 R6,R7 47k 1/ 1 6W-5% SMD CASE 0603
20 7 R1,R4,R5,R8,R16,R20, R26 0 CASE 0603
21 0 R21 0 (Not Mounted) CASE 0603
22 1 R28 220k 1/16W-5% SMD CASE 0603
23 7 R9,R10,R11,R12,R25,R27,R30100k 1/16W-5% SMD CASE 0603

100nF 50V-10% Ceramic CASE 0603

Tech.

Characteristics

(Not Mounted)
(Not Mounted)

Package

24 5 R13,R14,R17,R22,R23 1k 1/16W-5% SMD CASE 0603
25 2 R24 , R2 8 10k 1/16W-5% SMD CASE 0603
26 1 R29 NCP18WF104J03RB 100K - ß=4250 CASE 0603
27 2 R15,R18 100k 1% 1/16W-1% SMD CASE 0603
28 1 R19 120k 1% 1/16W-1% SMD CASE 0603
29 2 SW1,SW2 PUSH-BU TTON / DTSM31N 6x3.5mm - 1.6N See DS
30 1 SW3 TPA511G 4 ways joystic k + center CMS mount
31 1 U1 AT90USB1287 QFN64
32 2 U2,U3 AT45DB642D CASON8
33 1 U4 LP3982IMM-ADJ Vin Max 6V, 300mA MSOP8
34 1 U6 LM340MP5.0
35 1 Y1 8MHz CRYSTA L H=4mm HC49/4H

AT90USBKey Hardware User Guide 6-21

7627A–AVR–04/06

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Tel: [phone]
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Regional Headquarters

Europe

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