Avago ADNK-2703 Guide

ADNK-2703
One Chip USB Mouse Designer’s Kit
Design Guide
Description
The Universal Serial Bus (USB) is an industry standard
serial interface between a computer and peripherals such
as mouse, joystick, keyboard, headset, etc.The ADNK-2703
design guide describes how a cost-eective USB optical
mouse can be built using the Avago Technologies ADNS-
2700 one chip USB optical mouse sensor. The document
starts with basic operation of USB optical mouse, followed
by the assembly recommendation, USB interface, OTP
congurations, system design considerations and applica-
tions circuits, BOM, and PCB layout in appendices.
ADNK-2703 consists of an ADNS-2700 USB reference de-
sign mouse, ADNS-2700 sensor along with the ADNS-5100
round lens or ADNS-5100-001 trim lens, the ADNS-5200
Clip, the HLMP-EG3E-XXXXX LED sample units and CD-
ROM with all relevant technical literatures and hardware
les. The on-chip One-Time-Programmable (OTP) memory
provides exibility for various congurations on resolu-
tion mode, USB motion data reporting size, customizable
VID and PID.The ADNS-2700 sensor, the ADNS-5100 round
lens or ADNS-5100-001 trim lens, the ADNS-5200 Clip, and
the HLMP-EG3E-XXXXX LED data sheets are available from
Avago Technologies website: www.avagotech.com.
USB Mouse Basic
The ADNS-2700 is the primary navigation engine of the
USB optical mouse based on optical navigation technology
that measures changes in position by optically acquiring
sequential surface images (per frames) and mathemati-
cally determining the direction and magnitude of motion
movement. It contains an Image Acquisition System (IAS), a
Digital Signal Processor (DSP) and USB stream output. The
IAS acquires microscopic surface images via the lens. These
images are processed by the DSP to determine the direc-
tion and distance of motion. The DSP generates the 'x and
'y relative displacement values which are converted to USB
motion data via USB protocol to the computer to translate
into the motion of a cursor pointer on a screen display.
The Z-wheel movement is done in the traditional method
by encoding the quadrature signal of an optical sensor or
mechanical encoder. This design guide shows how to con-
nect to and manage the available conguration of mouse
hardware via OTP programming, as well as handle the USB
protocols as a standard way of reporting mouse move-
ment and button presses to the PC.
Features
xOne chip USB mouse sensor
xUSB 2.0 Low Speed Compliance
x12 bits USB motion data reporting
xMeets HID Revision 1.11
xSingle 5.0 volts power supply
xHigh speed motion detection at 30 inches per second
(ips) and acceleration up to 8 g
xInput buttons: 3 buttons
xZ-Wheel interface for vertical scroll
xIntegrated oscillator
xIntegrated USB D- pull-up resistor
xProduct string is set to “USB Optical Mouse”
xOn-chip OTP memory for device conguration
exibility without any external software driver:
– Programmable resolution from 500 to 1250 counts
per inch (cpi) with 250 cpi step.
– Programmable sensor orientation
– Programmable VID and PID.
Figure 1. ADNS-2700 3 button Optical Mouse Hardware Block Diagram
CONTROL AND IO PROCESSOR
OSCILLATOR POWER
ON RESET
LED
DRIVE
IMAGE
PROCESSOR
V
O
L
T
A
G
E
R
E
G
U
L
A
T
O
R
D+
D+
ZA
ZB
XY_LED
SW BUTTONS
VDDA 5
GND
5 VOLT
POWER
USB
PORT
Z WHEEL
LED
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Buttons
In this reference design, there are 3 standard button inputs:
B1,B2and B3 forleft, right, middlebuttonclickrespectively.
The minimum time between button pressed is TDBB. The
button connection is described in Figure 2.
R7
30 k
R10
15 k
R11
6.8 k
BL BR BM
SW
Pin
Note:
Use only 1%
tolerance
resistors
Figure 2. Button connections
Debounce Algorithm
x Button inputs B1, B2, and B3 are sampled every 6 ms.
x Two consecutive low values create a button press
event.
x Three consecutive high values create a button release
event.
Mechanical Z-Wheel
ThemotionofZ-wheelisdetectedusingtraditionalmethod
by encoding quadrature signal generated by the mechani-
cal Z-encoder. ADNS-2700 supports only mechanical
Z-Wheel for vertical scrolling. The mechanical Z-wheel will
be connected to the ZA and ZB pins with the common pin
connected to VDD5. Internal pulldowns on the ZA and ZB
pads provide a nominal pulldown current to pull the out-
put down when the Z-wheel switch opens.
The Z-Wheel reporting format which determines the ver-
tical scroll resolution is Z/2. The following must be imple-
mented when using with ADNS-2700. As shown in Figure
3 below, traveling along the quadrature signal to the right
produces a unique set of state transitions, and traveling to
the left produces another set of unique state transitions.
1. Use a rotary switch equivalent to the Panasonic part
EVQVX at http://industrial.panasonic.com/www-data/
pdf/ATC0000/ATC0000CE20.pdf (The key point is stable
“ZA” switch state in all detent positions).
2. Solder the rotary switch into the PCB such that the
common pin is closest to the cable end of the mouse.
(Metal plate faces to left).
Connect the “A” terminal of the rotary switch to “ZA” and
the “B” terminal to “ZB”. ZA MUST be connected to “Signal
A” in Figure 3 where the z-wheel detents are mechanically
stable.
Stable position of detent
15°±3° 15°±3°
T1 T2 T3 T4
Signal A OFF
Signal B OFF
ON
Figure 3. Optics Quadrature Signal Generation
Regulatory Requirements
x Passes FCC B and worldwide analogous emission limits
when assembled into a mouse with shielded cable and
following Avago Technologies recommendations.
x PassesEN61000-4-4/IEC801-4EFTtestswhenassembled
into a mouse with shielded cable and following Avago
Technologies recommendations.
x UL ammability level UL94 V-0.
x Provides sucient ESD creepage/clearance distance
to withstand discharge up to 15 kV when assembled
into a mouse with ADNS-5100 round lens according to
usage instructions above.
Some details on ADNK-2703
The ADNK-2703 reference design mouse unit allows users
to evaluate the performance of the Optical Tracking
Engine (sensor, lens, Led assembly clip, Led) over a USB
protocol. The optical mouse uses the ADNS-2700. This
kit also enables users to understand the recommended
mechanical assembly. (See Appendix C and D)
System Requirements
PCs using Windows£2003/ Windows£XP/ Windows£
Vista with standard 3-button USB mouse driver loaded.
Functionality
3-button, mechanical scroll wheel mouse.
Operating (For USB Mode)
Hot pluggable with USB port. The PC does not need to be
powered o when plugging or unplugging the evaluation
mouse.
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Customer supplied base plate with
recommended alignment features
per IGES drawing
ADNS-5100-001
Customer supplied PCB
ADNS-2700 (Sensor)
LED Clip
LED
Figure 4. Exploded view drawing of optical tracking engine with ADNS-2700 optical mouse sensor.
Caution: The lens is not permanently attached to the sensor and will drop out of the assembly.
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To Disassemble the ADNK-2703 Unit
The ADNK-2703 comprises of the plastic mouse casing,
printed circuit board (PCB), lens, buttons, and USB cable.
(See Figure 4) Unscrewing the one screw located at the
base of the unit can open the ADNK-2703 unit. Lifting and
pulling the PCB out of the base plate can further disas-
semble the mouse unit.
While reassembling the components, please make sure
that the Z height (Distance from lens reference plane to
surface) is valid. The Z-height is from 2.3 to 2.5 mm with a
nominal of 2.4 mm. Refer to Figure 5.
2.40
Z =
(0.094)
OBJECT SURFACE
LENS REFERENCE PLANE
LENS
SENSOR
Figure 5. Distance from lens reference plane to surface
Sensor
The sensor technical information is contained in the
ADNS-2700 Data Sheet.
Lens
The lens technical information is contained in the ADNS-
5100 round lens or ADNS-5100-001 trim lens Data Sheet.
LED Assembly Clip
The information on the assembly clip is contained in the
ADNS-5200 Data Sheet.
LED
The LED technical information is contained in the HLMP-
EG3E Data.
Base Plate Feature – IGES File
The IGES le on the CD-ROM provides recommended
base plate molding features to ensure optical alignment.
This includes PCB assembly diagrams like solder xture in
assembly and exploded view, as well as solder plate. See
Appendix D for details.
Reference Design Documentation – Gerber File
The Gerber File presents detailed schematics used in
ADNK-2703 in PCB layout form. See Appendix C for more
details.
Overall circuit
A schematic of the overall circuit is shown in Appendix A
of this document. Appendix B lists the bill of materials.
USB Interface
All USB Human Interface Device (HID) class applications
follow the same USB start-up procedure. The procedure is
as follows
1. Device Plug-in
When a USB device is rst connected to the bus, it is
powered and running rmware, but communications
on the USB remain non-functional until the host has
issued a USB bus reset.
2. Bus Reset
The pull-up resistor on D– noties the hub that a de-
vice has just been connected. The host recognizes the
presence of a new USB device and initiates a bus reset
to that device.
3. Enumeration
The host initiates SETUP transactions that reveal gen-
eral and device specic information about the mouse.
When the description is received, the host assigns a
new and unique USB address to the mouse. The mouse
begins responding to communication with the newly
assigned address, while the host continues to ask for
information about the device description, congura-
tion description and HID report description. Using the
information returned from the mouse, the host now
knows the number of data endpoints supported by the
mouse (2). At this point, the process of enumeration is
completed.
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Appendix A: Schematic Diagram of the Overall Circuit A1 Schematic for main board circuit using Avago Technologies ADNS-2700 optical mouse
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Appendix B: Bill of Materials for Components Shown on schematic
No Description RoHS F. Print Designator Qty
1 LED Clip TBA – D5 1
2 Black wire single core No N/A J1.J2 2
3 Cable - USB Cable A Type 5P No N/A H1 1
4 Capacitor Ceramic 0603 20 pF 50 V C0G Yes 0603 C9, C10 2
6Capacitor Aluminium Electrolytic Radial 10 PF 50 V 20% 7.5 mm Yes RB2/5 C2 1
7 Capacitor Ceramic Radial 100 nF 50 V Y5 V +80%,-20% 5 mm Yes RAD5/6.2/2 C3 1
8Capacitor Aluminium Radial 4.7 PF 16 V 20% 2 mm Yes RB2/5 C5 1
9 RCPT Pin Receptacle 1.02 mm Yes RCPT_1.02 U1 8
10 HWFL Header 2 mm 5way TBA HWFL_2/1X4 H1 1
11 PCB, P-AFX-4510M-01-Rev1, 2 Layer – ADNS-2700 Reference
Design Corded Mouse (NRD-1165)
Yes N/A – 1
13 Resistor Axial 0R 5% 0.25 W Yes AXIAL_0.5H R3 1
15 Resistor Axial 22R 1% 0.25 W Metal Film Yes AXIAL_0.5H R8, R9 2
16 Resistor Axial 30k 1% 0.25 W Metal Film Yes AXIAL_0.5H R7 1
17 Resistor Axial 15k 1% 0.25 W Metal Film Yes AXIAL_0.5H R10 1
18 Resistor Axial 6.8k 1% 0.25 W Metal Film Yes AXIAL_0.5H R11 1
19 Resistor Axial 62R 1% 0.125 W Metal Film Yes AXIAL_0.5H R5 1
20 Micro Switch SPDT Pin Plunger 0.75N Yes TH_D2F-F SW1, SW2 2
21 LED 5 mm Red No LED_5MM D5 1
22 Tactile Switch SPNO 6 mm x 6 mm Flat Plunger
(U-83 Casing) – Middle
No U-83 TACTILE
DIP SWITCH
SW3, SW4, SW5 3
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Appendix C: PCB Layout
Figure C1. PCB Schematic (Bottom Layer) Figure C2. PCB Schematic (Top Overlay)
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For product information and a complete list of distributors, please go to our web site: www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of AvagoTechnologies in the United States and other countries.
Data subject to change. Copyright © 2005-2010 Avago Technologies. All rights reserved.
AV02-2746EN - November 30, 2010
Appendix D: Kit Components
The designer’s kit contains components as follows:
Part Number Description Name Quantity
ADNS-2700 Single Chip USB Optical Mouse Sensor Sensor 5
ADNS-5100 Round Lens Lens 5
ADNS-5100-001 Trim Lens Lens 5
ADNS-5200 LED Assembly Clip Plate (Black Clip) LED Clip 5
HLMP-EG3E Red LED LED 5
ADNK-2703
CD
a. ADNS-2700 Single Chip USB Optical Mouse Sensor Data Sheet
b. ADNS-5100 / ADNS-5100-001 Data Sheet
c. ADNS-5200 LED Assembly Clip Data Sheet
d. HLMP-EG3E Red LED Data Sheet
e. 3D Model IGES Files
Hardware Support Files
ADNK-2703 BOM List
a. ADNK-2703 Schematic
b. IGES Base Plate Feature File
c. Gerber File
Software Support Files
a. OTP Programming Reference Software
b. USB Mouse Programming Guide Applications Note
1
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