Datasheet AT89RFD-11 Datasheet (Atmel)

AT89RFD-11: USB Mouse with Flash
Memory Reference Design

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

User Guide

AT89RFD-11 User Guide 1

7648A–USB–06/06

Section 1

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

1.1 Features....................................................................................................1-1

1.2 Introduction ...............................................................................................1-1

1.3 Key Reference Design Objectives ............................................................1-2

Section 2

Reference Design Overview.................................................................2-3

Section 3

Theory of Operation..............................................................................3-5

3.1 Mouse Buttons..........................................................................................3-5

3.2 Z-Wheel ....................................................................................................3-5

3.4 Sensor interface........................................................................................3-7

3.5 USB...........................................................................................................3-8

Section 4

Firmware Architecture.........................................................................4-15

Section 5

Schematic & BOM ..............................................................................5-17

AT89RFD-11 User Guide -1

7648A–USB–06/06

Section 1

Introduction

1.1 Features • One MCU = 2 devices (mouse and mass storage controllers) and one USB hub

• No hub required

• USB 2.0 Full Speed compliance

• 1 ms minimum Polling Interval

• Low Power bus-powered device

• Supported by all Microsoft O/S from Windows® 2000 and later

• 256 MB Nand Flash memory supported (driver support s me morie s up to 1G B)

• High speed motion detection up to 20 ips (inches per second) and 8 G

• Up to 800 CPI resolution

• No mechanical moving parts

• ISP (In System Programming) to upgrade the firmware

• 2K E2PROM to store parameters

• Project sources availble with royalty free licence agreement

1.2 Introduction This design guides describes the desig n of a composite device (mouse & mass storage

device) using the AT89C5131A Atmel microcontroller and the Avago ADNS-3030 opti­cal sensor. The firmware implementation section describes the firmware architecture to
implement a composite device with the mouse and the memor y functions. The Appen dix
contains the hardware implementation and the BOM of this reference design.

-2 AT89RFD-11 User Guide

7648A–USB–06/06

A familiarity with the AT89C5131A-M microcontroller (datasheet available on atmel web
site www.atmel.com), the ADNS 3030 sensor (datasheet available on avago web site
www.avagotech.com) and the USB specification (http://www.usb.org) is assumed.

1.3 Key Reference
Design
Objectives

1. Offer a complete solution based on a full speed mouse with a mass storage
capability.

2. Highlight the AT89C5131A benifits to manage two devices simultaneously.

3. Highlight the low power benifit of the ADNS 3030.

4. Flash based development platform to facilitate customization and firmware
upgrade.

+ =

AT89RFD-11 User Guide -3

7648A–USB–06/06

Section 2

Reference Design Overview

The reference design offers a full speed mouse with a mass storage capability to allow
the user to save and exchange files using his mouse. This solution is based on a double
enumeration (composite device) process to allow the management of both devices with
one microcontroller the AT89C5131A-M. The mouse is based on the ADNS-3030 Avago
sensor to collect the X, Y motion value. An optical quadratur e encoder provides th e Z­wheel movement. Each of the button switches is pulled up normally and provide s a
Ground when depressed.

Figure 2-1. .Reference Design Overview

AT89C5131A-M

ATMEL

microcontroller

AVAG O

ADN S-3030

Optical Mouse

Sensor

MOSI

MISO

SCLK

STDW

NCS

Z Optics

Wheel

Quad ratu re

signals

Left Butto n

Middle Button

Right Button

Nand Flash

Memory

I/Os

Control

&

command

MOTION

AT89RFD-11 User Guide -5

7648A–USB–06/06

Section 3

Theory of Operation

3.1 Navigation
Technology

The heart of the optical navigation sensor is a CMOS image array. An LED and an opti­cal system illuminate the surface that the sensor is navigating on. The texture of the
surface casts bright and dark spots formin g distinct images as the sensor is move d
across the surface. A Digital Signal Processing (DSP) engine and its built-in algorithm
evaluate these images and determine the magnitude and direction of the movement.
The motion data is made available in the delta_X and delta_Y registers for the system
controller to retrieve. An extensive power saving topology is implemented within the
ADNS-3030 navigation engine. A Motion pin (output) is available to act as the system
interrupt. As long as there is no motion the system can remain in Sleep mode allowing
maximum battery power saving. Based on the last detected motion the optical naviga­tion engine enters various power saving modes when no new motion occurs. These
power saving features are particularly beneficial for wireless.

Figure 3-1.

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7648A–USB–06/06

3.2 Sensor This reference design features the ADNS-3030 optical navigation engine. It contains an

Image Acquisition System (IAS), a Digital Signal Processor (DSP), and a three-wire
Serial Peripheral Interface consists of the serial clock (SCLK), the master-in/slave-out
(MISO) and the master-out/slave-in (MOSI). In addition two signals, Motion, is an output
intended to act as an interrupt to the microcontroller whenever the ADNS-3030 senses
motion, and SHTDWN, is an input pin to set the sensor in shutdown mo de. When the
mouse is moved the ADNS-3030 alerts the system controller by activating the Motion
signal. At the same time the ADNS-3030 accumulates the horizontal and vertical dis­placements (count per inch, or cpi) in its Delta_X and Delta_Y registers respectively.
The ADNS-3030 deactivates the Motion signal as soon as movement stops. The mouse
motion can be also detected by checking if the MOT bit (bit 7 in Motion register) is set.
The SmartSpeed technology automatically optimizes the frame rate by examining the
acquired images of the surface. It also manages the integrated LED driver to coordinate
with the shutter. The system controller reads the motion information and reports it to the
PC to update the cursor position. The advantages of using ADNS-3030 optical sensor
are the efficient power management, high tracking accuracy, and efficient communica­tions with the optical sensor via the full duplex SPI port. To learn more about sensor’s
technical information, please visit the Avago web site at http://www.avagotech.com

Figure 3-2. Sensor interface

3.3 Mouse Buttons Mouse buttons are connected as standard switches. These switches are pulled up by

the pull up resistors inside the m icrocontroller. Wh en the user depr esses a button, the
switch will be closed and the pin will be pulled LOW to GND. A LOW state at the pin is
interpreted as the button being depressed. A HIGH state is interpreted as the button has
been released or the button is not being depressed. In this reference design there are
three switches: left, Z-wheel (middle), and right.

AT89C5131A-M

ATMEL

microcontroller

AVAGO

ADNS-3030

Optical Mouse

Sensor

MOSI

MISO

SCLK

STDW

NCS

MOTION

AT89RFD-11 User Guide -7

7648A–USB–06/06

Figure 3-3. Mouse Buttons

3.4 Z-Wheel The motion of Z-wheel is detected using the quadr ature signal ge nerate d by optical sen-

sors. Two phototransistors are connected in a source-follower configuration forming
Channel A and Channel B. An infrared LED shines, causing the phototransistors to turn
on. In between the phototransistors and LED is a pinwheel that turns on the mouse ball
rollers. The fan of this pinwheel is mechanically de sig ned to block th e infra red light su ch
that the phototransistors are turned on and off in a quadrature output pattern. Every
change in the phototransistor outputs represents a count of mouse movement. Co mpar­ing the last state of the optics to the current state derives directional information. As
shown in the Figure below, rotating the wheel forward p roduces a unique set o f state
transitions, and rotating the wheel backward produces another set of unique state
transitions.

Figure 3-4. Optics Quadrature Signal Generation

Left Button

Middle Button

Right Button

AT89C5131A-M

P1_0
P1_2
P1_1

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7648A–USB–06/06

3.5 Memory The target memory used with this reference design is a Nand Flash memory (Micron

M29F2G08AAB) of 256 MBytes. This memory allow the user to save and exchange data
and files with any PC.

The Nand Flash memory is connected to the AT89C5131A-M as below. P0 an d P2 ports
are mandatory in order to access the Nand Flash using MOVX instructions.

Figure 3-5. Nand Flash memory interface

3.6 USB

3.6.1 Multiple
Enumeration
(composite device)

Thanks to its seven endpoints, the AT89C5131A-M can manage several USB devices
simultanuously using the multiple enumerations functionality (composite device). This
functionnality allows the user to declare one device with several interfaces. Each inter­face is seen and managed as a stand-alone device from the PC point of view. In our
case we declare two interfaces: one to manage the mass storage device and the other
to manage the HID mouse device.

To be able to manage two interfaces, the microcontroller should have at the least a con­trol endpoint and the sum of the endpoints required by both interfaces. For example for
this reference design we need 1 endpoint for control transfer, 1 endpoint for mouse and
2 endpoints for mass storage, which means that we need 4 endpoints to make this
application.

P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7

AVss Vss

Xtal2

Xtal1

24

MHz

22pF

22pF

100

27
27

1.5k

D-

D+

Vref

PLLF

10nF 2.2nF

I/O.0
I/O.1
I/O.2
I/O.3
I/O.4
I/O.5
I/O.6
I/O.7

MiCRON

M 29F 2G08A A B

A T89C 5131A -M

Vss

P2.0
P2.1

CLE
ALE

USB connector

3.3V

regulator

D-

D+

Vbus

GND

2.2k

Vcc

Vcc

R/B

10µF

Tantal.

P3.7
P2.3

P2.4

VDD AVD D

1µF

100nF

Vcc

P3.3

Vcc

EA

100k

P3.0

Write

Protection

2.2k

WE

CE

RE

P3.6

PSEN

ISP

2.2k

optional

10µF

Tantal.

10k

Vcc

WP

Ucap

AT89RFD-11 User Guide -9

7648A–USB–06/06

Figure 3-6. Multiple Enumeration

From the PC point of view, the reference design is presented as two stand-alone
devices. The figure below shows how the device appears in the device manager.

Device

descriptor

Configuration

descriptor

Interface

descriptor

M ass Storage

Intera fce

descriptor

HID mouse

Endpoint IN

descriptor

HID

descriptor

Endpoint O UT

descriptor

Endpoint IN

descriptor

Report

descriptor

Physical

descriptor

Mass Storage

Device

Mouse Device

-10 AT89RFD-11 User Guide

7648A–USB–06/06

Figure 3-7. Device Manager Multiple Enumeration

3.6.2 HID Mouse Overview The USB mouse application is a simple data exchange between the PC and the mouse.

The PC asks the mouse if there is a new data available each P time (polling interval
time), the mouse will send the data if it is available, otherwise it will send a NAK (No
Acknowlodge) to tell the PC that there is no data available now.

The data sent to the PC is called report. This report has the structure below :
Figure 1. USB report structure

The X, Y are collected thanks to the sensor.

AT89RFD-11 User Guide -11

7648A–USB–06/06

The button values are updated following the button switches state (1 if depressed, 0 if
released).

The scroll wheel value is updated using the motion of Z-Wheel as explained in section

4.2

3.6.3 Mass Storage
Overview

The Mass Storage application is simply file transfer between the PC and the device.
The USB data exchange for this application is based on the SCSI (Small Computer Sys-

tem Interface) commands which use two bulk endpoints (one IN and one OUT) to
perform the status and data transfer. The endpoint 0 (control endpoint) is used only to
perform the enumeration process, the errors management and to determine the LUN
(Logical Unit Number) value.

In other words, the Mass Storage application is a set of SCSI commands send by the
host to manage the file transfers.

The Mass Storage class allows one device to manage several memories at the same
time thanks to the LUN.

Figure 3-8. Mass Storage Application Overview

The standard enumeration process (USB chapter 9 support) is performed through the
default control endpoint. This process consists of a set of parameters sent by the d evice
to the host to identify the device class and load the appropriate drivers. This parameters
are called the descriptors.

The SCSI command are performed through both endpoints (IN or OUT). Each SCSI
command is decoded and transmitted to the appropriate memory through a command
set (Read, Write, is memory present, is memory write protected,...).

The memory answers are converted in SCSI status before being wrapped in USB CSW
(Command Status Wrapper) and sent to the USB Host controller. Because the USB bus
is a single master bus (the USB Host), each data transfer is initiate d by the USB Host,
following a specific Command-Data-Status flow (see figure below)

-12 AT89RFD-11 User Guide

7648A–USB–06/06

Figure 3-9. Command/Data/Status Flow

The CBW (Command Block Wrapper) contains some USB information such as the LUN
addressed, the length of the SCSI command, and of course, it also contains the SCSI
command for the memory.

The CSW (Command Status Wrapper) contain s the SCSI status. If the status is GOOD,
the Host will send the next following command. If the status is different from GOOD
(FAILED, PHASE ERROR,...), the host will ask for more information regarding the error
by sending a REQUEST SENSE command.

Note: Please refer to Mass Storage Application Note (available on www.atmel.com) for more

details

3.6.4 Power Management Although this is not a wireless design it is worthwhile to mention the low-power feature of

the ADNS-3030.
The ADNS-3030 has three power-saving modes. Each mode has a different motion

detection period, affecting response time to mouse motion (Response Time). The sen­sor automatically changes to the appropria te mode, depending o n the time since the last
reported motion (Downshift Time). The parameters of each mode are shown in the fol­lowing table. Mode Response Time (nominal) Downshift Time (nominal)

Each rest mode successively decreases in power consumption. The ADNS-3030 con­sumes typically 32 µA in Rest 3 mode. Parameter Symbol Minimum Typical Maximum
Units Notes DC Supply Current In various modes.

Mode Response Time (nominal) Downshit Time (nominal)

Rest1 16.5 ms 237 ms

Rest 2 82 ms 8.39 s
Rest 3 410 ms 504 s

AT89RFD-11 User Guide -13

7648A–USB–06/06

3.6.4.1 Motion Pin Timing The motion pin is a level-sensitive output that signals the microcontroll er when motion

has occurred. The Motion pin is lowered whenever the Motion bit is set; in other words,
whenever there is data in the Delta_X or Delta_Y registers. Clear ing the Motion bit (by
reading Delta_Y and Delta_X, or writing to the Motion register) will set the Motion pin
high. This feature further contributes to the system power saving. As long as the ADNS­3030 is not sensing motion the microcontroller can enter its own sleep mode as long as
it is capable of waking up from an interrupt by the Motion pin.

3.6.4.2 LED Mode For power savings, the LED will not be continuously on. ADNS-3030 will flash the LED

only when needed. This is fully automated and managed by the ADNS-3030. As a result
the ADNS-3030 consumes only about 4 mA of average current while in the active mode.

Parameter Symbol Minumum Typical Maximum Units Notes

DC Supply IDD 3.9 13

mA

Average current,including
LED current.

No load on MISO,
MOTION.

Current In 0.63 2.3

Various 0.13 0.5

Modes 0.032 0.15

-14 AT89RFD-11 User Guide

7648A–USB–06/06

3.6.5 ISP The ISP (In System Programming) allows the user to upgrade the firmware using the

USB port. To use this feature the user needs Flip software (available on
www.atmel.com).

Please follow the below instruction to put the reference design in ISP mode:

1. Unplug the reference design from the PC.

2. Push the button located on the bottom of the reference desgin (see the figure
below)

Figure 3-10. ISP Button

3. Plug the reference design to the PC

4. Release the button

5. Check the Device Manager, and you should see the same icon (Jungo® icon) as
shown in the figure below. If not, start again from the step1

6. Launch Flip software and start upgrading your firmware

ISP Button

AT89RFD-11 User Guide -15

7648A–USB–06/06

Figure 3-11. Device Manager

AT89RFD-11 User Guide -17

7648A–USB–06/06

Section 4

Firmware Architecture

The firmware of this reference design is written in C language. The main files are
explained below:

• usb_task.c: This file manages the USB enumeration, the SCSI command, the USB
mouse motion (X,Y motion, buttons click, scroll wheel motion) and the USB events
(suspend, resume, reset...)

• usb_enum.c: This file contains the USB endpoint 0 ma nagement routines
corresponding to the standard enumeration process (refer to chapter 9 of the USB
specification). This file calls routines of the usb_user_enum.c file for non-standard
request management. The enumeration parameters (descriptor t ables) are contained
in the usb_user_configuration.c file.

• usb_user_enum.c: This file contains the non-standard USB requests.

• usb_user_configuration.c: This file contains the enumeration parameters (USB
descriptors)

• sensor.c: This file contains the functions to initialize the sensor and the wheel,
manage the sensor access (read, write) and the wheel motion detection.

• ctrl_access.c: This file manages the interface between the USB and the target
memory using the LUN (Logical Unit Number).

• nf.c: This file contains the high level NF with 2Kb page routines

• nf_mem.c: This file contains the interface routines of Nand Flash memory

• The figure hereunder shows the firmware architecture implementation

-18 AT89RFD-11 User Guide

7648A–USB–06/06

Figure 4-1. Firmware Architecture Implementation

USB enumeration management

(usb_user_enum.c, usb_enum.c,

usb_user_configuration.c,

scsi_decoder.c)

usb driver (usb_drv.c)

MCU driver (mcu_drv.c)

SPI driver (spi_lib .c )

Nand Flash driver (nf_d rv .c)

applicationAPIDriversHardware

MCU/Mouse/Memory

hardware

sensor & wheel

management

(sensor.c)

tasks management

(usb_task.c)

-enumeration process

-Mass Storage SCSI command management

-USB mouse report management

usb_task()

-po lling call

Is_usb_mouse_event()

-interrupt call each SOF (1ms)

-Check if mouse motion OK

-check if button pressed or released

-check if wheel motion OK

-Fill the USB mouse report out

-Enumeration process management

-SCSI command management

-USB requests management

-USB descriptors declaration

-SCSI commands decoder

-sensor and wheel initialization

-read and write sensor functions

-wheel interrupt management

memory management

(ctrl_access.c, nf.c,

nf_mem.c)

-manage the access to the memory

-manage the NF memory state,
read, write...

AT89RFD-11 User Guide -19

7648A–USB–06/06

Section 5

Schematic & BOM

Vcc

VccVcc

P1_4

P1_3

P3_4

P1_6

P1_7

P1_5

C2

10nFC210nF

C4

10nFC410nF

C31μF C31μF

C1

1μFC11μF

NCS1MISO

2

SCLK3MOSI

4

MOTION

5

XY_LED

6

LED_GND

7

NC

8

AGND

9

SHTDWN

10

NC

20

AGND

19

NC18NC

17

GND

16

VDD

15

AGND

14

GND13GND

12

AVDD

11

U1

ADNS3030

U1

ADNS3030

R110R1

10

C6

10nFC610nF

C5

1μFC51μF

D1

HLMP_ED80

D1

HLMP_ED80

-20 AT89RFD-11 User Guide

7648A–USB–06/06

_EA

_EA

XTAL1

_PSEN

PLLF

XTAL2

XTAL2

XTAL1

_PSEN

UCAP

UCAP

PLLF

/RST

/RST

VCC

AVCC

AVSS

AVCC

Vcc

Vcc

Vcc

Vcc

Vcc

P3_6

P0_7

P0_6

P0_5

P0_4

P0_3

P0_2

P0_1

P2_3

P2_4

P3_0

P1_0

P1_1

P1_2

P3_2

P3_3

P3_4

P3_5

VREF

D+

D-

P3_5

P3_3

P3_2

P1_7

P1_6

P1_5

P2_1

P2_0

P0_0

P1_4

P1_3

P1_2

P1_1

P1_0

P3_7

Wheel

Smaller Swith

possible (Only

for ISP

programming)

Close to μC

Close to μC

Close to μC

C9

1μFC91μF

R2

2.2 KR22.2 K

C8

1μFC81μF

SW1

ISP

SW1

ISP

Y1 CRYSTAL 24MHzY1 CRYSTAL 24MHz

C13

10nF

C13

10nF

R6

4K7R64K7

R3

10KR310K

R7

100R7100

C10

22 pF

C10

22 pF

C14

2.2 nF

C14

2.2 nF

1 2

SW4

Scroll

SW4

Scroll

C12

10nF

C12

10nF

1 2

SW3

Right

SW3

Right

R4

100R4100

VCC2QA1QB

3

U3

MID-95A3LH

U3

MID-95A3LH

R5

4K7R54K7

1 2

SW2

Left

SW2

Left

D2

MIE-114A1

D2

MIE-114A1

P2.0/A8/D8

56

P2.1/A9/D9

57

P2.2/A10/D10

58

P1.5/CEX2/KIN5/MISO

59

P1.6/CEX3/KIN6/SCK

60

P1.7/CEX4/KIN7/MOSI

61

P4.0/SCL

62

P4.1/SDA

63

P2.3/A11/D11

2

P2.4/A12/D12

3

P2.5/A13/D13

4

XTAL25XTAL16P2.6/A14/D14

7

P2.7/A15/D15

8

VDD9AVDD10UCAP11AVSS12P3.0/RxD

14

PLLF

19

D-

20

D+

21

VREF

22

UVSS

23

EA

24

ALE

25

PSEN

26

P3.1/TxD

27

P3.2/INT0

28

P3.3/INT1/LED0

29

P3.4/T0

30

P3.5/T1/LED1

31

nc11

34

P3.6/WR/LED2

35

P0.7/AD7/D7

36

P0.6/AD6/D6

37

P0.5/AD5/D5

38

P3.7/RD/LED3

39

P0.4/AD4/D4

40

VSS

42

P0.3/AD3/D3

43

RST

44

P0.2/AD2/D2

45

P0.1/AD1/D1

46

nc13

47

P0.0/AD0/D0

55

P1.4/CEX1/KIN4

54

P1.3/CEX0/KIN3

53

P1.2/ECI/KIN2

52

P1.1/T2EX/KIN1/SS

51

P1.0/T2/KIN0

50

nc16

64

nc1

1

nc15

49

nc14

48

nc12

41

nc10

33

nc9

32

nc7

18

nc6

17

nc516nc4

15

nc3

13

U2

AT89C5131A-M_VQFP64

U2

AT89C5131A-M_VQFP64

C11

22 pF

C11

22 pF

C7

100nFC7100nF

AT89RFD-11 User Guide -21

7648A–USB–06/06

5 4 3 2

Vcc

Vcc

P0_0

P0_1

P0_2

P0_3

P0_4

P0_5

P0_6

P0_7

P2_0

P2_1

P2_3

P3_7

P3_6

P2_4

C15

100nF

C15

100nF

R8

10KR810K

C16

100nF

C16

100nF

/CE9/RE8/WE18/WP

19

ALE

17

CLE

16

IO7

44

IO6

43

IO5

42

IO4

41

IO3

32

IO2

31

IO1

30

IO0

29

RDY/B

7

VCC

37

VCC

12

VSS

36

VSS

13

U4

M29F2G08AAB / MICRON

U4

M29F2G08AAB / MICRON

-22 AT89RFD-11 User Guide

7648A–USB–06/06

D+

D-

VREF

Vbus

USB_CON_D-

USB_CON_D+

GND

Vcc

VREF

D+

D-

3.3V

See recommendations folder

123

4

J1

Male Header : Molex 53261-0571

J1

Male Header : Molex 53261-0571

IN

3

GND

2

OUT

1

U5

L78L33 STM SOT89

U5

L78L33 STM SOT89

R10 27R10 27

R11 27R11 27

C18

100nF

C18

100nF

R9

1.5 KR91.5 K

C17

1μF

C17

1μF

AT89RFD-11 User Guide -23

7648A–USB–06/06

5.1 Bill Of Materials

Item QTY Description Value Designators

1 6 Capac itor

1 µF, 10%, Tantalum, 16V

C1, C3, C5, C8, C9, C 17

2 2 Capac itor

22 pF

C10, C11

3 5 Capac itor

10 n F, 10%

C2, C4, C6, C12, C13

4 4 Capac itor

100 n F

C7, C15, C16,C18

5 1 Capac itor

2. 2 nF, 10%

C14

61 LED

Navigation D1

71 LED

IR, Scroll wheel D2

8 1 Connect or

4-pin Male Header

J1

9 Cable ass embly

USB, Type A to pigtail ,

Not on s c hematic

10 1 Connect or Housi ng

4 posit ion, DO N OT INST ALL

Not on s c hematic

11 4 Terminal

Crimp, instal l on Item 9

Not on s c hematic

12 1 Resis t or (0805)

10

R1

13 1 Resis t or (0805)

2. 2 k

R2

14 1 Resis t or (0805)

100

R4

15 2 Resis t or (0805)

4. 7 k

R5, R6

16 2 Resis t or (0805)

10 k

R3, R8

17 1 Resis t or (0805)

100, 10%

R7

18 1 Resis t or (0805)

1. 5 k

R9

19 2 Resis t or (0805)

27, 1%

R10, R11

20 1 Switch

PUSH-BUTTON

SW1

21 1 Switch

Left

SW2

22 1 Switch

Right

SW3

23 1 Switch

Scroll

SW4

24 1 IC

Optical navigat ion sensor

U1

25 1 IC

Microcontroller

U2

26 1 IC

Quadratur e encoder

U3

27 1 IC

Flash memory, 2G

U4

28 1 IC

Voltage regulat or

U5

29 1 Crys tal

24 MHz

Y1
30 1 LED c lip not s hown on s c hem atic
31 1 Lens not s hown on s c hem at ic

Printed on recycled paper.

7648A–USB–06/06

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