Datasheet - Pixart Imaging Inc.

ADNS-7550
Integrated molded lead-frame DIP Sensor
Data Sheet
Theory of Operation
Features
The ADNS-7550 integrated molded lead-frame DIP
sensor comprises of sensor and VCSEL in a single
package.
• Wide operating voltage: 4.0V-5.25V.
The advanced class of VCSEL was engineered by PixArt
Imaging to provide a laser diode with a single longitudinal and a single transverse mode. In contrast to
most oxide-based single-mode VCSEL, this class of PixArt
VCSEL remains within single mode operation over a wide
range of output power. It has significantly lower power
consumption than a LED. It is an excellent choice for
optical navigation applications.
• Laser Technology
The sensor is based on Laser technology, which
measures changes in position by optically acquiring sequential surface images (frames) and mathematically
determining the direction and magnitude of movement.
It contains an Image Acquisition System (IAS), a Digital
Signal Processor (DSP), and a four wire serial port. The IAS
acquires microscopic surface images via the lens and illumination system. These images are processed by the
DSP to determine the direction and distance of motion.
The DSP calculates the Δx and Δy relative displacement
values. An external microcontroller reads the Δx and Δy
information from the sensor serial port. The microcontroller then translates the data into PS2, USB, or RF signals
before sending them to the host PC or game console.
• Small form factor, integrated molded lead-frame chipon-board package
• High speed motion detection up to 30 ips and 8g
• Enhanced SmartSpeed self-adjusting frame rate for
optimum performance
• Motion detect pin output
• 12-bits motion data registers.
• Internal oscillator – no clock input needed.
• Selectable 400, 800, 1200, 1600, 2000 cpi resolution.
• Four wire serial port
• Minimal number of passive components
• Laser fault detect circuitry on-chip for Eye Safety
Compliance
• Advanced Technology VCSEL chip
• Single Mode Lasing operation
• 832-865 nm wavelength
Applications
• Laser Mice
• Optical trackballs
• Integrated molded lead-frame input devices
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PixArt Imaging Inc.
E-mail: [email protected]
PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Pinout of ADNS-7550 Optical Mouse Sensor
Pin
Name
Description
1
VCSEL+VE
Positive Terminal of VCSEL
2
LASER_NEN
LASER Enable (Active LOW)
3
NCS
Chip select (active low input)
Product Number
1
16
2
15
3
4
MISO
Serial data output (Master In/Slave Out)
5
SCLK
Serial clock input
6
MOSI
Serial data input (Master Out/Slave In)
7
MOTION
Motion Detect (active low output)
8
XYLASER
XYLASER
6
9
VDD5
5V Input
7
10
NC
No Connection
11
GND
Ground
12
RefB
3V output
13
RefA
1.8V regulator output
14
DGND
Digital Ground
15
VDDIO
IO Voltage input (1.65~3.6V)
16
VCSEL-VE
Negative Terminal of VCSEL
14
4
13
5
12
11
Date Code
10
8
9
Lot Code
Vcsel Binning
Item
Marking
Product Number
A7550
Date Code
XYYWWZV
VCSEL Binning
KL
Lot Code
VVV
Remarks
X = Subcon Code
YYWW = Date Code
Z = Sensor Die Source
V = VCSEL Die Source
Numeric
Figure 1. Device pin-out for ADNS-7550
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Feature For
Illustration Only
9.10
0.358
4.10
0.161
Section A-A
0.36
0.014
1.69
0.067
2.83
0.111
4.05
0.159
Pin 1
10.90
(At shoulder)
0.429
9.10
0.358
16.20
0.638
16X 0.50
0.020
1.52
0.060
0.78
0.031
0.20
0.008
3.18
0.125
A
A
2X 0.50
0.020
2X 0.50
0.020
VCSEL hole
0.89
0.035
1.78
0.070
Optical center
Sensor hole
Notes:
1. Dimensions in milimeter / inches.
2. Dimensional tolerance: ±0.1mm.
3. Coplanarity of lead: 0.1mm
4. Lead pitch tolerance: ±0.15mm.
5. Non-cumulative pitch tolerance: ±0.15mm.
6. Maximum flash: ±0.2mm.
7. Angular tolerance: 3q
8. Chamfer (25q x2) on the taper side of the lead.
9. Brackets () indicate reference dimension.
10. Document Number: LSR_INT_16A_Pkg_001
CAUTION: It is advised that normal static precautions be taken in handling and assembly
of this component to prevent damage and/or degradation which may be induced by ESD
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3.96
0.156
10.90 ± 0.40 (At lead tip)
0.429 ± 0.016
Figure 2. Package outline drawing
2.41
0.095
Protective
kapton tape
10.10
0.398
5.05
0.199
0.50
0.020
PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Regulatory Requirements
• Passes FCC B and worldwide analogous emission limits
when assembled into a mouse with shielded cable
and following PixArt recommendations.
Laser Mouse Sensor
NCS
Power and Control
GND
RefB
RefA
VDDIO
Serial and Registers
VDD5
Image Array
DSP
• Passes IEC-1000-4-3 radiated susceptibility level when
assembled into a mouse with shielded cable and
following PixArt recommendations.
SCLK
MOSI
• Passes EN61000-4-4/IEC801-4 EFT tests when
assembled into a mouse with shielded cable and
following PixArt recommendations.
MISO
MOTION
DGND
• Provides sufficient ESD creepage/clearance distance
to avoid discharge up to 15kV when assembled into a
mouse according to usage instructions above.
Oscillator
XYLASER
LASER Drive
VCSEL-VE
VCSEL
LASER_NEN
VCSEL+VE
Figure 3. Block diagram of ADNS-7550 integrated molded lead-frame DIP sensor
Guide post A
Sensor Hole
Sensor
Guide Post A
VCSEL Hole
PCB
Lens
B
B
Guide post B
PCB thickness
Base Plate Foot
Base Plate
Navigation Surface
DETAIL A
Top of PCB to Surface
Lens reference plane to Tracking surface (Z)
7.40
0.291
2.40
0.094
7.83
Die to Surface
0.308
DETAIL A
Gap between PCB and base plate
Top of sensor to surface
Figure 4. 2D Assembly drawing of ADNS-7550 sensor coupled with the ADNS-6150 lens, PCB and base plate (top and cross-sectional view)
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1.60
0.063
3.40
0.134
9.05
0.356
PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Assembly Recommendation
1. Insert the integrated molded lead-frame DIP
sensor and all other electrical components into the
application PCB.
7. Optional: The lens can be permanently locked to the
sensor package by melting the lens’ guide posts over
the sensor with heat staking process.
2. This sensor package is only qualified for wave-solder
process.
8. Tune the laser output power from the VCSEL to meet
the Eye Safe Class I Standard as detailed in the LASER
Power Adjustment Procedure.
4. Place the lens onto the base plate. Care must be taken
to avoid contamination on the optical surfaces.
5. Remove the protective kapton tapes from the optical
aperture of the sensor and VCSEL respectively. Care
must be taken to keep contaminants from entering
the aperture.
6. Insert the PCB assembly over the lens onto the base
plate. The sensor package should self-align to the lens.
The optical position reference for the PCB is set by the
base plate and lens. The alignment guide post of the
lens locks the lens and integrated molded lead-frame
DIP sensor together. Note that the PCB motion due to
button presses must be minimized to maintain optical
alignment.
Design considerations for improving ESD Performance
For improved electrostatic discharge performance,
typical creepage and clearance distance are shown in
the table below. Assumption: base plate construction as
per the PixArt supplied IGES file and ADNS-6150, ADNS6160-001 or ADNS-6170-002 lens:
Lens
ADNS-6150
ADNS-6160-001
ADNS-6170-002
Creepage
12.0 mm
13.50 mm
20.30 mm
Clearance
2.1 mm
1.28 mm
1.28 mm
Note that the lens material is polycarbonate and
therefore, cyanoacrylate based adhesives or other
adhesives that may damage the lens should NOT be
used.
Lens interference
3.18
0.125
7X 1.78
0.070
0
(2.78)
0.110
Pin #1
2.31
0.091
1.05
0.041
14.18
0.558
9. Install the mouse top case. There must be a feature in
the top case (or other area) to press down onto the
sensor to ensure the sensor and lenses are interlocked
to the correct vertical height.
9.65
0.380
10.70
0.421
0
5.35
0.211
3. Wave-solder the entire assembly in a no-wash solder
process utilizing a solder fixture. The solder fixture
is needed to protect the sensor during the solder
process. The fixture should be designed to expose
the sensor leads to solder while shielding the optical
aperture from direct solder contact.
Optical center
0.89
0.035
∅ 1.10
0.043
13.35
0.526
Pad ring
16X ∅ 0.70
0.028
Figure 5. Recommended PCB mechanical cutouts and spacing
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1
2
3
4
5
HEADER 5
H1
VCC
GND
D+
DSHLD
IMPORTANT
Refer to Note 3
R2
R3
VCC2
20R
20R
C12
20pF
C
A
B
Z-Encoder
Z1
1
2
3
6MHz
X1
NOT ASSEMBLY
C13
20pF
R1
1k5
VCC1
12
11
2
3
19
18
17
PA4
PA5
XI/PC6
XO/EXCLK/PC7
DP_CK
DM_DA
PC0/VPP
SPCP868A
VCC1
U1
PA0/CKO
PA1
PA2
PA3
PB0/SS
PB1/SDI
PB2/SCK
PB3/SDO
PA6
PA7
16
15
14
13
7
8
9
10
5
6
C1
100nF
1
1
1
SW3
SW2
SW1
2
3
2
3
2
3
25LC040P
CS
SCK
SI
SO
U2
Middle Click
Right Click
Left Click
1
6
5
2
VCC
WP
HOLD
VSS
8
3
7
4
C3
100nF
5
4
3
6
7
VCC2
C2
100nF
SCLK
MISO
NCS
MOSI
MOTION
U3
C4
4.7uF/16V
A7550
VCSEL-VE
VCSEL+VE
LASER_NEN
XYLASER
REFA
C8
100nF
16
1
2
8
13
C9
3.3uF/16V
C7
470pF/50V
C10
100nF
1
C11
3.3uF/16V
Q1
NTA4151P
C5
1uF/16V
C6
10nF/25V
6
Notes
1. The supply and ground paths should be laid out using a star methodology.
2. Level shifting is required to interface a 5V micro-controller to the ADNS-7550. If a 3V micro-controller is used, the 74VHC125 component shown may be omitted
3. All grounds MUST be correctly separated into digital and analog grounds. The digital and analog ground lines MUST be reconnected as far away as possible at either the negative terminal of the battery
or at the USB connector.
Figure 6. Schematic Diagram for 3-Button Scroll Wheel Corded Mouse
ORANGE
BLUE
GREEN
WHITE
VCC1
VDD-3.3V
20
VC
1
VCC
100k
10
NC
R4
VDD-3.3V
15
VDDIO
Application Circuit
9
VDD5
GND
11
GND
4
12
REF B
DGND
14
2
3
PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
LASER Drive Mode
The laser is driven in pulsed mode during normal
operation. A calibration mode is provided which drives
the laser in continuous (CW) operation.
7.
Program registers 0x1c and 0x1d with increasing
values to achieve an output power of not more than
506uW to meet class 1 Eye Safety over temperature.
If this power is obtained, the calibration is complete,
skip to step 11.
8.
If it was not possible to achieve the power target, set
the laser current to the minimum value by writing
0x00 to register 0x1c, and the complementary value
0xff to register 0x1d.
9.
Set the Range and Range_C bits in registers 0x1a
and 0x1f, respectively, to choose to the higher laser
current range.
Eye Safety
The ADNS-7550 integrated molded lead-frame DIP
sensor and the associated components in the schematic
of Figure 5 are intended to comply with Class 1 Eye
Safety Requirements of IEC 60825-1. PixArt Imaging
suggests that manufacturers perform testing to verify
eye safety on each mouse. It is also recommended to
review possible single fault mechanisms beyond those
described below in the section “Single Fault Detection”.
Under normal conditions, the sensor generates the drive
current for the VCSEL.
In order to stay below the Class 1 power requirements,
LASER_CTRL0 (register 0x1a), LASER_CTRL1 (register
0x1f ), LSRPWR_CFG0 (register 0x1c) and LSRPWR_CFG1
(register 0x1d) must be programmed to appropriate
values. The ADNS-7550 integrated molded lead-frame
DIP sensor which comprised of the sensor and VCSEL;
is designed to maintain the output beam power within
Class 1 requirements over components manufacturing
tolerances and the recommended temperature range
when adjusted per the procedure below and implemented as shown in the recommended application circuit of
Figure 6. For more information, please refer to Eye Safety
Application Note AN 5361.
10. Program registers 0x1c and 0x1d with increasing
values to achieve an output power of not more than
506uW to meet class 1 Eye Safety over temperature.
11. Save the value of registers 0x1a, 0x1c, 0x1d, and
0x1f in non-volatile memory in the mouse. These
registers must be restored to these values every
time the ADNS-7550 is reset.
12. Reset the mouse, reload the register values from
non-volatile memory, enable Calibration mode,
and measure the laser power to verify that the
calibration is correct.
Good engineering practices such as regular power meter
calibration, random quality assurance retest of calibrated
mice, etc. should be used to guarantee performance, reliability and safety for the product design.
LASER Power Adjustment Procedure
LASER Output Power
1.
The ambient temperature should be 25C +/- 5C.
2.
Set VDD5 to its permanent value.
3.
Set the Range bits (bit 7 and 6 of register 0x1f ) to
b’01.
The laser beam output power as measured at the navigation surface plane is specified below. The following conditions apply:
4.
5.
6.
Set the Range_C1 and Range_C0 complement bits
(bit 7 and 6 of register 0x1f ) to b’10.
Enable the Calibration mode by writing to bits [3,
2, 1] of register 0x1A so the laser will be driven with
100% duty cycle.
1.
The system is adjusted according to the above
procedure.
2.
The system is operated within the recommended
operating temperature range.
3.
No allowance for optical power meter accuracy is
assumed.
Set the laser current to the minimum value
by writing 0x00 to register 0x1c, and the
complementary value 0xFF to register 0x1d.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Disabling the LASER
LASER_NEN is connected to the gate of a P-channel
MOSFET transistor which when ON connects RefB to the
LASER. In normal operation, LASER_NEN is low. In the
case of a fault condition (ground or RefB at XYLASER),
LASER_NEN goes high to turn the transistor off and disconnect RefB from the LASER.
Single Fault Detection
ADNS-7550 is able to detect a short circuit or fault
condition at the XYLASER pin, which could lead to
excessive laser power output. A path to ground on this
pin will trigger the fault detection circuit, which will turn
off the laser drive current source and set the LASER_NEN
output high. When used in combination with external
components as shown in the block diagram below, the
system will prevent excess laser power for a resistive
path to ground at XYLASER by shutting off the laser. In
addition to the ground path fault detection described
above, the fault detection circuit is continuously
checking for proper operation by internally generating a
path to ground with the laser turned off via LASER_NEN.
If the XYLASER pin is shorted to VDD5/RefA/RefB, this test
will fail and will be reported as a fault.
Ref B
ADNS-7550
Microcontroller
LASER_NEN
LASER
DRIVER
G
D
VDD3
fault control
block
VCSEL+VE
VCSEL
Serial port
voltage sensor
VCSEL-VE
XYLASER
current set
GND
Figure 7. Single Fault Detection and Eye-safety Feature Block Diagram
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S
PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Absolute Maximum Ratings
Parameter
Symbol
Min
-40
Storage Temperature
TS
Lead Soldering Temperature
TSolder
Supply Voltage
VDD3
VDDIO
ESD (Human-body model)
VESD
Input Voltage
VIN
Latchup Current
IOUT
Max
Units
85
ºC
260
ºC
-0.5
3.7
V
-0.5
3.7
V
2
kV
All pins
mA
All pins
Max
Units
Notes
-0.5
V = A,V
Min
For 10 seconds, 1.8mm below
seating plane. See soldering reflow
profile in Figure 9
VDDIO+0.5
20
VCSEL Die Source Marking
Notes
V=C
Parameter (For VCSEL only)
Symbol
Max
Min
DC Forward current
IF
12
7.0
mA
Peak Pulsing current
IP
19
9
mA
Power Dissipation
P
24
24
mW
Reverse voltage
VR
5
8
V
Laser Junction Temperature
TJ
150
170
ºC
Duration = 100ms, 10% duty cycle
I = 10μA
Notes:
1. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are the stress ratings
only and functional operation of the device at these or any other condition beyond those indicated for extended period of time may affect
device reliability.
2. The maximum ratings do not reflect eye-safe operation. Eye safe operating conditions are listed in the power adjustment procedure section.
3. The inherent design of this component causes it to be sensitive to electrostatic discharge. The ESD threshold is listed above. To prevent ESDinduced damage, take adequate ESD precautions when handling this product.
Recommended Operating Conditions
Parameter
Symbol
Minimum
Operating Temperature
TA
0
Power supply voltage
VDD5
4.0
Power supply rise time
VRT5
1
Supply noise (Sinusoidal)
Typical
Maximum Units
Notes
40
°C
5.25
Volts
Including noise.
100
ms
0 to 5.0V
VNA
100
mVp-p
10kHz-50MHz
Serial Port Clock Frequency
fSCLK
1
MHz
Active drive, 50% duty cycle
Distance from lens reference plane to surface
Z
2.62
mm
Results in +/- 0.22 mm minimum DOF.
See Figure 8.
Speed
S
30
in/sec
Acceleration
A
8
g
Load Capacitance
Cout
100
pF
2.18
5.0
2.40
MOTION, MISO
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Optical/Electrical Characteristics (at Tc = 5°C to 45°C):
VCSEL Die Source Marking
V = A,V
V=C
Parameter
Symbol
Min
Peak Wavelength
λ
832
Maximum Radiant
Power
LOPmax
4.5
4.0
mW
Wavelength
Temperature coefficient
dλ/dT
0.065
0.065
nm/ºC
Wavelength
Current coefficient
dλ/dI
0.21
0.3
nm/mA
Beam Divergence
[email protected]/
e^2
15
16
deg
Threshold current
Ith
4.2
3.0
mA
Slope Efficiency
SE
0.4
0.35
W/A
Forward Voltage
VF
2.1
Typ
Max
Min
865
832
2.4
Typ
Max
865
2.1
2.4
Units
Notes
nm
V
Maximum output power
under any condition. This
is not a recommended
operating condition and
does not meet eye safety
requirements.
At 500uW output power
Comments:
1. VCSELs are sorted into bins as specified in the power adjustment procedure. Appropriate binning register data values are used in the application
circuit to achieve the target output power. The VCSEL binning is marked on the integrated molded lead-frame DIP sensor package.
2. When driven with current or temperature range greater than specified in the power adjustment procedure section, eye safety limits may be
exceeded. The VCSEL should then be treated as a Class IIIb laser and as a potential eye hazard.
3. Over driving beyond LOPmax limit will cause the VSCEL to enter into on unstable region. Any LOP reference point in the laser power calibration
process.
Sensor
Lens
Lens to Surface 2.40
Navigation Surface
Figure 8. Distance from lens reference plane to surface, Z
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Figure 9. Recommended Soldering Reflow Profile
DC Electrical Specifications
Electrical Characteristics over recommended operating conditions. (Typical values at 25 °C, VDD=5.0 V, VDDIO= 2.8V)
Parameter
Symbol
DC Supply Current
in various modes
IDD_RUN
Minimum Typical Maximum Units
2.8
Peak Supply Current
150
Shutdown Supply
Current
IDDSTDWN
Input Low Voltage
VIL
Input High Voltage
VIH
Input Hysteresis
VI_HYS
100
Input Leakage Current
Ileak
±1
XY_LASER Current
ILAS
0.8
Notes
3.5
mA
40
mA
200
μA
NCS, SCLK = VDDIO
MOSI, MISO = Hi-Z
0.2VDDIO
V
SCLK, MOSI, NCS
0.8VDDIO
±10
Average current, including LASER current.
No load on MISO, MOTION.
V
SCLK, MOSI, NCS
mV
SCLK, MOSI, NCS
μA
Vin = 0.7*VDDIO , SCLK, MOSI, NCS
mA
VXY_LASER >=0.3V
LSRPWR_CFG0 = 0xFF
LSRPWR_CFG 1 = 0x00
Laser Current (fault mode) ILAS_FAULT
300
uA
XY_LASER Rleakage < 75kOhms to Gnd
Output Low Voltage,
MISO, MOTION
VOL
0.2*VDDIO
V
Iout=1mA, MISO, MOTION
Output High Voltage,
MISO, MOTION
VOH
V
Iout=-1mA, MISO, MOTION
Output Low Voltage,
LASER_NEN
VOL
V
Iout= 1mA, LASER_NEN
Output High Voltage,
LASER_NEN
VOH
V
Iout= -0.5mA, LASER_NEN
Input Capacitance
Cin
pF
MOSI, NCS, SCLK
0.8*VDDIO
0.2*VREFB
0.8*VREFB
10
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
AC Electrical Specifications
Electrical Characteristics over recommended operating conditions. (Typical values at 25 °C, VDD=5.0V, VDDIO= 2.8V)
Parameter
Symbol
Maximum
Units
Notes
Motion delay
after reset
tMOT-RST
Minimum Typical
23
ms
From SW_RESET register write to valid motion,
assuming motion is present
Shutdown
tSTDWN
50
ms
From Shutdown mode active to low current
Wake from
shutdown
tWAKEUP
ms
From Shutdown mode inactive to valid motion.
Notes: A RESET must be asserted after a shutdown.
Refer to section “Notes on Shutdown also note
tMOT-RST
23
MISO rise time
tr-MISO
150
300
ns
CL = 100pF
MISO fall time
tf-MISO
150
300
ns
CL = 100pF
MISO delay
after SCLK
tDLY-MISO
120
ns
From SCLK falling edge to MISO data valid, no load
conditions
MISO hold time
thold-MISO
0.5
1/fSCLK
us
Data held until next falling SCLK edge
MOSI hold time
thold-MOSI
200
ns
Amount of time data is valid after SCLK rising edge
MOSI setup time
tsetup-MOSI 120
ns
From data valid to SCLK rising edge
SPI time between
write commands
tSWW
30
μs
From rising SCLK for last bit of the first data byte, to
rising SCLK for last bit of the second data byte.
SPI time between
write and read
commands
tSWR
20
μs
From rising SCLK for last bit of the first data byte, to
rising SCLK for last bit of the second address byte.
SPI time between
read and subsequent
commands
tSRW
tSRR
500
ns
From rising SCLK for last bit of the first data byte, to
falling SCLK for the first bit of the address byte of
the next command.
SPI read address
-data delay
tSRAD
4
μs
From rising SCLK for last bit of the address byte, to
falling SCLK for first bit of data being read.
NCS inactive after
motion burst
tBEXIT
500
ns
Minimum NCS inactive time after motion burst
before next SPI usage
NCS to SCLK active
tNCS-SCLK
120
ns
From NCS falling edge to first SCLK rising edge
SCLK to NCS inactive
(for read operation)
tSCLK-NCS
120
ns
From last SCLK rising edge to NCS rising edge, for
valid MISO data transfer
SCLK to NCS inactive
(for write operation)
tSCLK-NCS
20
us
From last SCLK rising edge to NCS rising edge, for
valid MOSI data transfer
NCS to MISO high-Z
tNCS-MISO
500
ns
From NCS rising edge to MISO high-Z state
MOTION rise time
tr-MOTION
150
300
ns
CL = 100pF
MOTION fall time
tf-MOTION
150
300
ns
CL = 100pF
Transient Supply
Current
IDDT
45
mA
Max supply current during a VDD ramp from 0 to
2.8V
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Resolution(DPI)
Resolution vs Z- Height on General Surfaces (A7550)
1200
White Paper
1000
Black Formica
800
Photo Paper
600
White Formica
Manila
400
200
White Delrin
Spruce Wood
0
-0.3
-0.2
-0.1
0
Z-Height(mm)
0.1
0.2
0.3
Figure 10. Mean Resolution vs. Z at 800cpi
Typical Path Deviation Largest Single Perpendicular Deviation
From A Straight Line at 45 Degrees Path Length = 4 inches;
Speed = 6 ips; Resolution = 800cpi
Mouse Count
45
White Paper
Black Formica
Photo Paper
White Formica
Manila
White Delrin
Spruce Wood
35
25
15
5
-5
-0.3
-0.2
-0.1
0
Z - Height(mm)
0.1
0.2
0.3
Figure 11. Average Error vs. Distance at 800cpi (mm)
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Motion Pin Timing
VCSEL’s Typical Characteristics
The motion pin is a level-sensitive output that signals the
micro-controller 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. Clearing the motion bit (by reading Delta_X
and Delta_Y, or writing to the Motion register) will put
the motion pin high.
Forward Voltage, VF (V)
2.5
V=C
2.0
V = A,V
1.5
1.0
LASER Mode
0.5
For power savings, the VCSEL will not be continuously on.
ADNS-7550 will flash the VCSEL only when needed.
0.0
0
2
4
6
Forward Current, IF (mA)
8
10
Figure 12. Forward Voltage vs. Forward Current for VCSEL
50
Temperature Rise (°C)
V=C
V = A,V
40
30
Synchronous Serial Port
The synchronous serial port is used to set and read parameters in the ADNS-7550, and to read out the motion
information. The port is a four-wire port. The host
micro-controller always initiates communication; the
ADNS-7550 never initiates data transfers. SCLK, MOSI,
and NCS may be driven directly by a micro-controller.
The port pins may be shared with other SPI slave devices.
When the NCS pin is high, the inputs are ignored and the
output is tri-stated.
The lines that comprise the SPI port:
20
10
0
0
1
2
3 4
5 6 7 8 9 10 11 12 13 14 15
Forward Current, IF (mA)
Figure 13. Junction Temperature Rise vs. Forward Current for VCSEL
SCLK:
Clock input. It is always generated by the master
(the micro-controller).
MOSI:
Input data. (Master Out/Slave In)
MISO:
Output data. (Master In/Slave Out)
NCS:
Chip select input (active low). NCS needs to be low
to activate the serial port; otherwise, MISO will be
high Z, and MOSI & SCLK will be ignored. NCS can
also be used to reset the serial port in case of an
error.
Chip Select Operation
The serial port is activated after NCS goes low. If NCS
is raised during a transaction, the entire transaction is
aborted and the serial port will be reset. This is true for
all transactions. After a transaction is aborted, the normal
address-to-data or transaction-to-transaction delay is
still required before beginning the next transaction. To
improve communication reliability, all serial transactions should be framed by NCS. In other words, the port
should not remain enabled during periods of non-use
because ESD and EFT/B events could be interpreted as
serial communication and put the chip into an unknown
state. In addition, NCS must be raised after each burstmode transaction is complete to terminate burst-mode.
The port is not available for further use until burst-mode
is terminated.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Write Operation
Read Operation
Write operation, defined as data going from the microcontroller to the ADNS-7550, is always initiated by the
micro-controller and consists of two bytes. The first byte
contains the address (seven bits) and has a “1” as its MSB
to indicate data direction. The second byte contains
the data. The ADNS-7550 reads MOSI on rising edges of
SCLK.
A read operation, defined as data going from the
ADNS-7550 to the micro-controller, is always initiated
by the micro-controller and consists of two bytes. The
first byte contains the address, is sent by the microcontroller over MOSI, and has a “0” as its MSB to indicate
data direction. The second byte contains the data and is
driven by the ADNS-7550 over MISO. The sensor outputs
MISO bits on falling edges of SCLK and samples MOSI bits
on every rising edge of SCLK.
NCS
1
2
1
A
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
D
D
D
D
D
D
1
A
SC L K
M O SI
A
6
A
5
A
4
3
A
2
A
1
A
D
0
7
D
6
5
4
3
2
1
0
M I SO
M O S I D rive n by M icro -C o ntro lle r
Figure 14. Write Operation
SCLK
SCLK
MOSI
tHOLD-MISO
tDLY-MISO
tHold,MOSI
MISO
tsetup , MOSI
Fig ure 15. MOSI Setup and Hold Time
D0
Figure 17. MISO Delay and Hold Time
NCS
SCLK
Cycle #
1
2
3
4
5
6
7
A6
A5
A4
A3
A2
A1
8
9
10
11
12
13
14
D7
D6
D5
D4
D3
D2
15
16
SCLK
MOSI
0
A0
MISO
Figure 16. Read Operation
tSRAD delay
Note:
The 0.5/fSCLK minimums high state of SCLK is also the minimum
MISO data hold time of the ADNS-7550. Since the falling edge of
SCLK is actually the start of the next read or write command, the
ADNS-7550 will hold the state of data on MISO until the falling edge
of SCLK.
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D1
D0
6
PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Required timing between Read and Write Commands
There are minimum timing requirements between read and write commands on the serial port.
t SWW
SCLK
Address
Data
Address
Write Operation
Data
Write Operation
Figure 18. Timing between two write commands
If the rising edge of the SCLK for the last data bit of the second write command occurs before the required delay
(tSWW ), then the first write command may not complete correctly.
tSWR
SCLK
Address
Data
Address
Write Operation
Next Read
Operation
Figure 19. Timing between write and read commands
If the rising edge of SCLK for the last address bit of the read command occurs before the required delay (tSWR), the
write command may not complete correctly.
tSRW & t SRR
tSRAD
SCLK
Address
Data
Read Operation
Address
Next Read or
Write Operation
Figure 20. Timing between read and either write or subsequent read commands
During a read operation SCLK should be delayed at least tSRAD after the last address data bit to ensure that the ADNS7550 has time to prepare the requested data. The falling edge of SCLK for the first address bit of either the read or
write command must be at least tSRR or tSRW after the last SCLK rising edge of the last data bit of the previous read
operation.
Burst Mode Operation
Burst mode is a special serial port operation mode that may be used to reduce the serial transaction time for a motion
read. The speed improvement is achieved by continuous data clocking to or from multiple registers without the need
to specify the register address, and by not requiring the normal delay period between data bytes.
Burst mode is activated by reading the Motion_Burst register. The ADNS-7550 will respond with the contents of the
Motion, Delta_X_L, Delta_Y_L, Delta_XY_H, SQUAL, Shutter_Upper, Shutter_Lower and Maximum_Pixel registers in
that order. The burst transaction can be terminated anywhere in the sequence after the Delta_X value by bringing the
NCS pin high. After sending the register address, the micro-controller must wait tSRAD and then begin reading data.
All data bits can be read with no delay between bytes by driving SCLK at the normal rate. The data are latched into the
output buffer after the last address bit is received. After the burst transmission is complete, the micro-controller must
raise the NCS line for at least tBEXIT to terminate burst mode. The serial port is not available for use until it is reset with
NCS, even for a second burst transmission.
tSRAD
SCLK
Motion_Burst Register Address
Read First Byte
First Read Operation
Read Second Byte
Read Third Byte
Figure 21. Motion Burst Timing
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Notes on Power-up
Notes on Shutdown
The ADNS-7550 does not perform an internal power up
self-reset; the POWER_UP_RESET register must be written
every time power is applied. The appropriate sequence is
as follows:
The ADNS-7550 can be set in Shutdown mode by
writing 0xe7 to register 0x3b. The SPI port should not
be accessed when Shutdown mode is asserted, except
the power-up command (writing 0x5a to register 0x3a).
(Other ICs on the same SPI bus can be accessed, as long
as the sensor’s NCS pin is not asserted.) The table below
shows the state of various pins during shutdown. To
deassert Shutdown mode:
i.
Apply power to VDD5 and VDDIO in any order, with
the delay of no more than 100ms in between each
supply. Ensure all supplies are stable.
ii.
Drive NCS high, then low to reset the SPI port.
iii.
Write 0x5a to register 0x3a.
iv.
Wait for at least one frame.
v.
Clear observation register.
vi.
Wait at least one frame and check observation
register, all bits 0-3 must be set.
i.
Write 0x5a to register 0x3a
ii.
Wait for at least one frame.
iii. Clear observation register.
iv. Wait at least one frame
v.
Check observation register, all bits 0-3 must be set to
1.
vii. Read from registers 0x02, 0x03, 0x04 and 0x05 (or
read these same 4 bytes from burst motion register
0x42) one time regardless of the motion pin state.
vi. Write 0x27 to register 0x3C
viii. Write 0x27 to register 0x3C
viii. Write 0x01 to register 0x21
ix.
Write 0x0a to register 0x22
ix. Write 0x32 to register 0x3C
x.
Write 0x01 to register 0x21
x.
xi.
Write 0x32 to register 0x3C
xi. Write 0x05 to register 0x3C
xii. Write 0x20 to register 0x23
xii. Write 0xB9 to register 0x37
xiii. Write 0x05 to register 0x3C
xiii. Any register settings must then be reloaded.
vii. Write 0x0a to register 0x22
Write 0x20 to register 0x23
xiv. Write 0xB9 to register 0x37
During power-up there will be a period of time after the
power supply is high but before any clocks are available.
The table below shows the state of the various pins
during power-up and reset.
State of Signal Pins After VDD is Valid
Before Reset
Pin
On
Power-Up
NCS
Functional
MISO
Undefined Undefined
Depends on
Functional NCS
SCLK
Ignored
Ignored
Depends on
Functional NCS
MOSI
Ignored
Ignored
Depends on
Functional NCS
MOTION
Undefined Undefined Undefined Functional
LASER_
NEN
Undefined Undefined Undefined Functional
NCS High
NCS Low
After Reset
Hi
Low
Functional
Pin
Status when Shutdown Mode
NCS
Functional [1]
MISO
Undefined [2]
SCLK
Ignore if NCS = 1 [3]
MOSI
Ignore if NCS = 1 [4]
LASER_NEN
High(off )
MOTION
Undefined [2]
1. NCS pin must be held to 1 (high) if SPI bus is shared with other
devices. It is recommended to hold to 1 (high) during Power
Down unless powering up the Sensor. It must be held to 0 (low) if
the sensor is to be re-powered up from shutdown (writing 0x5a to
register 0x3a).
2. Depend on last state
3. SCLK is ignore if NCS is 1 (high). It is functional if NCS is 0 (low).
4. MOSI is ignore if NCS is 1 (high). If NCS is 0 (low), any command
present on the MOSI pin will be ignored except power-up command
(writing 0x5a to register 0x3a).
Note:
There are long wakeup times from shutdown. These features should
not be used for power management during normal mouse motion.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Registers
The ADNS-7550 registers are accessible via the serial port. The registers are used to read motion data and status as
well as to set the device configuration.
Address
Register
Read/Write
Default Value
0x00
Product_ID
R
0x32
0x01
Revision_ID
R
0x03
0x02
Motion
R/W
0x00
0x03
Delta_X_L
R
0x00
0x04
Delta_Y_L
R
0x00
0x05
Delta_XY_H
R
0x00
0x06
SQUAL
R
0x00
0x07
Shutter_Upper
R
0x00
0x08
Shutter_Lower
R
0x64
0x09
Maximum_Pixel
R
0xd0
0x0a
Pixel_Sum
R
0x80
0x0b
Minimum_Pixel
R
0x00
0x0c
CRC0
R
0x00
0x0d
CRC1
R
0x00
0x0e
CRC2
R
0x00
0x0f
CRC3
R
0x00
0x10
Self_Test
W
NA
0x11
Reserved
0x12
Configuration2_Bits
R/W
0x28
0x13-0x19
Reserved
0x1a
LASER_CTRL0
R/W
0x00
0x1b
Reserved
0x1c
LSRPWR_CFG0
R/W
0x00
0x1d
LSRPWR_CFG1
R/W
0x00
0x1e
Reserved
0x1f
LASER_CTRL1
R/W
0x00
0x20-0x2d
Reserved
0x2e
Observation
R/W
0x00
0x2f-0x34
Reserved
0x35
Pixel_Grab
R/W
0x00
0x36
H_RESOLUTION
R/W
0x04
0x37-0x39
Reserved
0x3a
POWER_UP_RESET
W
NA
0x3b
Shutdown
W
NA
0x3c
Reserved
0x3d
Shut_thr
R/W
0x56
0x3e
Inverse_Revision_ID
R
0xfc
0x3f
Inverse_Product_ID
R
0xcd
0x42
Motion_Burst
R
0x00
18
PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Product_ID
Address: 0x00
Access: Read
Reset Value: 0x32
Bit
7
6
5
4
3
2
1
0
Field
PID7
PID6
PID5
PID4
PID3
PID2
PID1
PID0
Data Type: 8-Bit unsigned integer
USAGE: This register contains a unique identification assigned to the ADNS-7550. The value in this register does not
change; it can be used to verify that the serial communications link is functional.
Revision_ID
Address: 0x01
Access: Read
Reset Value: 0x03
Bit
7
6
5
4
3
2
1
0
Field
RID7
RID6
RID5
RID4
RID3
RID2
RID1
RID0
Data Type: 8-Bit unsigned integer.
USAGE: This register contains the IC revision. It is subject to change when new IC versions are released.
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ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Motion
Address: 0x02
Access: Read/Write
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
MOT
PIXRDY
PIXFIRST
OVF
LP_VALID
FAULT
Reserved
Reserved
Data Type: Bit field.
USAGE: Register 0x02 allows the user to determine if motion has occurred since the last time it was read. If the MOT
bit is set, then the user should read registers 0x03 and 0x04 to get the accumulated motion. Read this register before
reading the Delta_X_L, Delta_Y_L and Delta_XY_H registers.
Writing anything to this register clears the MOT and OVF bits, Delta_X_L, Delta_Y_L and Delta_XY_H registers. The
written data byte is not saved.
If one of the 12 bits motion registers overflows, then absolute path data is lost and the OVF bit is set. Once OVF bit set,
Sensor will stop accumulating motion data. Motion registers and OVF bit will be clear after data been read out.
The PIXRDY bit will be set whenever a valid pixel data byte is available in the Pixel_Grab register. Check that this bit
is set before reading from Pixel_Grab. To ensure that the Pixel_Grab pointer has been reset to pixel 0,0 on the initial
write to Pixel_Grab, check to see if PIXFIRST is set to high.
Field Name
Description
MOT
Motion since last report
0 = No motion
1 = Motion occurred, data ready for reading in Delta_X_L, Delta_Y_L and Delta_XY_H registers
PIXRDY
Pixel_Grab data byte is available in Pixel_Grab register
0 = data not available
1 = data available
PIXFIRST
This bit is set when the Pixel_Grab register is written to or when a complete pixel array has been read,
initiating an increment to pixel 0,0.
0 = Pixel_Grab data not from pixel 0,0
1 = Pixel_Grab data is from pixel 0,0
OVF
Motion overflow, ΔY and/or ΔX buffer has overflowed since last report
0 = no overflow
1 = Overflow has occurred
LP_VALID
Laser Power Settings
0 = register 0x1a and register 0x1f or register 0x1c and register 0x1d do not have complementary values
1 = laser power is valid
FAULT
Indicates that VCSEL is shorted to GND or VDD
0 = no fault detected
1 = fault detected.
Note: PixArt recommends that registers 0x02, 0x03, 0x04and 0x05 be read sequentially.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Delta_X_L
Address: 0x03
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
X7
X6
X5
X4
X3
X2
X1
X0
Data Type: Eight bit 2’s complement number.
USAGE: X movement is counts since last report. Absolute value is determined by resolution. Reading clears the
register.
Motion
-2048
-2047
-2
-1
0
+1
+2
Delta_X
800
801
FE
FF
00
01
02
+2046 +2047
7FE
7FF
NOTE: PixArt recommends that registers 0x02, 0x03, 0x04 and 0x05 be read sequentially.
Delta_Y_L
Address: 0x04
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
Data Type: Eight bit 2’s complement number.
USAGE: Y movement is counts since last report. Absolute value is determined by resolution. Reading clears the
register.
Motion
-2048
Delta_Y
800
-2047
-2
-1
0
+1
+2
801
FE
FF
00
01
02
+2046 +2047
7FE
7FF
NOTE: PixArt recommends that registers 0x02, 0x03, 0x04 and 0x05 be read sequentially.
Delta_XY_H
Address: 0x05
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
X11
X10
X9
X8
Y11
Y10
Y9
Y8
Data Type: 2’s complement number, upper 4 bits of Delta_X and Delta_Y.
USAGE: Delta_XY_H must be read after Delta_X_L and Delta_Y_L to have the full motion data. Reading clear the
registers.
NOTE: PixArt recommends that registers 0x02, 0x03, 0x04 and 0x05 be read sequentially.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
SQUAL
Address: 0x06
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
SQ7
SQ6
SQ5
SQ4
SQ3
SQ2
SQ1
SQ0
Data Type: Upper 8 bits of a 9-bit unsigned integer.
USAGE: SQUAL (Surface Quality) is a measure of the number of valid features visible by the sensor in the current
frame.
The maximum SQUAL register value is 242. Since small changes in the current frame can result in changes in SQUAL,
variations in SQUAL when looking at a surface are expected. The graph below shows 800 sequentially acquired SQUAL
values, while a sensor was moved slowly over white paper. SQUAL is nearly equal to zero, if there is no surface below
the sensor. SQUAL is typically maximized when the navigation surface is at the optimum distance from the imaging
lens (the nominal Z-height).
SQUAL Value (White Paper)
At Z=0mm; Circle = 7.5" diameter; Speed=6ips
Squal value
200
150
100
50
0
1
56 111 166 221 276 331 386 441 496 551 606 661 716 771 826
Count
Figure 22. SQUAL Values at 800cpi (White Paper)
Mean SQUAL vs Z (White Paper)
At Z=0mm; Circle = 7.5" diameter; Speed=6ips
Squal count
200
Avg-3sigma
Avg
150
Avg+3sigma
100
50
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
Delta from Nominal Focus (mm)
Figure 23. Mean SQUAL vs. Z (White Paper)
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Shutter_Upper
Address: 0x07
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
S15
S14
S13
S12
S11
S10
S9
S8
Shutter_Lower
Address: 0x08
Access: Read
Reset Value: 0x64
Bit
7
6
5
4
3
2
1
0
Field
S7
S6
S5
S4
S3
S2
S1
S0
Data Type: Sixteen bit unsigned integer.
USAGE: Units are clock cycles. Read Shutter_Upper first, then Shutter_Lower. They should be read consecutively. The
shutter is adjusted to keep the average and maximum pixel values within normal operating ranges. The shutter value
is automatically adjusted.
Shutter value
Shutter Value (White Paper)
At Z=0mm; Circle Diameter=7.5"; Speed=6ips
80
70
60
50
40
30
20
10
0
1
47
93 139 185 231 277 323 369 415 461 507 553 599 645 691 737 783 829 875
Count
Figure 24. Shutter Values at 800cpi (White Paper)
Shutter value (Count)
Mean Shutter vs Z (White paper)
At Z=0mm; Circles Diameter=7.5"; Speed=6ips
600
550
500
450
400
350
300
250
200
150
100
50
0
Avg-3sigma
Avg
Avg+3sigma
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
Delta from Nominal Focus (mm)
Figure 25. Mean Shutter vs. Z (White Paper)
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ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Maximum_Pixel
Address: 0x09
Access: Read
Reset Value: 0xd0
Bit
7
6
5
4
3
2
1
0
Field
MP7
MP6
MP5
MP4
MP3
MP2
MP1
MP0
Data Type: Eight-bit number.
USAGE: Maximum Pixel value in current frame. Minimum value = 0, maximum value = 254. The maximum pixel value
can vary with every frame.
Pixel_Sum
Address: 0x0a
Access: Read
Reset Value: 0x80
Bit
7
6
5
4
3
2
1
0
Field
AP7
AP6
AP5
AP4
AP3
AP2
AP1
AP0
Data Type: High 8 bits of an unsigned 16-bit integer.
USAGE: This register is used to find the average pixel value. It reports the upper eight bits of a 18-bit counter, which
sums all pixels in the current frame. It may be described as the full sum divided by 1024. To find the average pixel
value, use the following formula:
Average Pixel = Register Value * 1024/676 = Register Value * 1.515
The maximum register value is 167. The minimum is 0. The pixel sum value can change on every frame.
Minimum_Pixel
Address: 0x0b
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
MP7
MP6
MP5
MP4
MP3
MP2
MP1
MP0
Data Type: Eight-bit number.
USAGE:Minimum Pixel value in current frame. Minimum value = 0, maximum value = 254. The minimum pixel value
can vary with every frame.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
CRC0
Address: 0x0c
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
CRC07
CRC06
CRC05
CRC04
CRC03
CRC02
CRC01
CRC00
Data Type: Eight-bit number.
USAGE: Register 0x0c reports the first byte of the system self test results. Value = F4.
CRC1
Address: 0x0d
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
CRC17
CRC16
CRC15
CRC14
CRC13
CRC12
CRC11
CRC10
Data Type: Eight-bit number.
USAGE: Register 0x0d reports the second byte of the system self test results. Value = 54.
CRC2
Address: 0x0e
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
CRC27
CRC26
CRC25
CRC24
CRC23
CRC22
CRC21
CRC20
Data Type: Eight-bit number.
USAGE: Register 0x0e reports the third byte of the system self test results. Value = 6D.
CRC3
Address: 0x0f
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
CRC37
CRC36
CRC35
CRC34
CRC33
CRC32
CRC31
CRC30
Data Type: Eight-bit number.
USAGE: Register 0x0f reports the fourth byte of the system self test results. Value = EB.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Self_Test
Address: 0x10
Access: Write
Reset Value: NA
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
TESTEN
Data Type: Bit field
USAGE: Before performing system self test, reset the chip. Then, set the TESTEN bit in register 0x10 to start the system
self test. The test takes 250ms. During this time, do not write or read through the SPI port. Results are available in the
CRC0-3 registers. After self-test, reset the chip again to start normal operation.
Field Name
Description
TESTEN
Enable System Self Test
0 = Disabled
1 = Enable
Reserved
Address: 0x11
Configuration2_bits
Address: 0x12
Access: Read/Write
Reset Value: 0x28
Bit
7
6
5
4
3
2
1
0
Field
0
RES1
RES0
Reserved
Reserved
Reserved
Reserved
Reserved
Data Type: Bit field
USAGE: Register 0x12 allows the user to change the configuration of the sensor. The RES bit allows selection between
400, 800, 1200 and 1600 cpi resolution.
Field Name
Description
RES[1:0]
Sets resolution
00 = 400
01 = 800
10 = 1200
11 = 1600
Reserved
Address: 0x1b
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
LASER_CTRL0
Address: 0x1a
Access: Read/Write
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Range1
Range0
Reserved
Reserved
CAL2
CAL1
CAL0
Force_Disable
Data Type: Bit field
USAGE: This register is used to control the laser drive. Bits 7 and 6 require complement values in register 0x1F. If the
registers do not contain complementary values for these bits, the laser is turned off and the LP_VALID bit in the
MOTION register is set to 0. The registers may be written in any order after the power ON reset.
Field Name
Description
Range[1:0]
Rbin Settings
00= Laser current range from approximately 0.9mA to 3mA
01= Laser current range from approximately 2mA to 5mA
11 = Laser current range from approximately 4mA to 10mA
10 = Invalid setting, LPVALID will be set and laser will off.
CAL2-0
Laser calibration mode
- Write 101b to bits [3,2,1] to set the laser to continuous ON (CW) mode.
- Write 000b to exit laser calibration mode, all other values are not recommended.
Reading the Motion register (0x02 or 0x42) will reset the value to 000b and exit
calibration mode.
Force_Disable
LASER force disabled
0 = LASER_NEN functions as normal
1 = LASER_NEN output is high.
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
LSRPWR_CFG0
Address: 0x1c
Access: Read/Write
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
LP7
LP6
LP5
LP4
LP3
LP2
LP1
LP0
Data Type: 8 Bit unsigned
USAGE: This register is used to set the laser current. It is to be used together with register 0x1D, where register 0x1D
contains the complement of register 0x1C. If the registers do not contain complementary values, the laser is turned
off and the LP_VALID bit in the MOTION register is set to 0. The registers may be written in any order after the power
ON reset.
Field Name
Description
LP7 – LP0
Controls the 8-bit DAC for adjusting laser current.
One step is equivalent to (1/384)*100% = 0.26% drop of relative laser current.
Refer to the table below for examples of relative laser current settings.
LP7 - LP3
LP 2
LP 1
LP 0
Relative Laser Current
00000
0
0
0
33.59%
00000
0
0
1
33.85%
00000
0
1
0
34.11%
: :
:
:
:
: :
11111
1
0
1
99.48%
11111
1
1
0
99.74%
11111
1
1
1
100%
LSRPWR_CFG1
Address: 0x1d
Access: Read/Write
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
LPC7
LPC6
LPC5
LPC4
LPC3
LPC2
LPC1
LPC0
Data Type: 8 Bit unsigned
USAGE: The value in this register must be a complement of register 0x1C for laser current to be as programmed,
otherwise the laser is turned off and the LP_VALID bit in the MOTION register is set to 0. Registers 0x1C and 0x1D may
be written in any order after power ON reset.
Reserved
Address: 0x1e
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
LASER_CTRL1
Address: 0x1f
Access: Read/Write
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Range_C1
Range_C0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Data Type: 8 Bit unsigned
USAGE: Bits 7 and 6 of this register must be the complement of the corresponding bits in register 0x1A for the VCSEL
control to be as programmed, otherwise the laser turned is off and the LP_VALID bit in the MOTION register is set to
0. Registers 0x1A and 0x1F may be written in any order after power ON reset.
Reserved
Address: 0x20-0x2d
Observation
Address: 0x2e
Access: Read/Write
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
OBS4
OBS3
OBS2
OBS1
OBS0
Data Type: Bit field
USAGE: Register 0x2e provides bits that are set every frame. It can be used during EFT/B testing to check that the chip
is running correctly. Writing anything to this register will clear the bits. Wait for at least one frame before reading the
register.
Field Name
Description
OBS4-0
Set every frame
Reserved
Address: 0x2f-0x34, 0x36-0x39
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
Pixel_Grab
Address: 0x35
Access: Read/Write
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
Data Type: 8 Bit Word
USAGE: For test purposes, the sensor will read out the contents of the pixel array, one pixel per frame. To start a pixel
grab, write anything to this register to reset the pointer to pixel 0,0. Then read the PIXRDY bit in the Motion register.
When the PIXRDY bit is set, there is valid data in this register to read out. After the data in this register is read, the
pointer will automatically increment to the next pixel. Reading may continue indefinitely; once a complete frame’s
worth of pixels has been read, PIXFIRST will be set to high to indicate the start of the first pixel and the address pointer
will start at the beginning location again.
Top X-ray View of Mouse
LB
P
O
S
I
T
I
V
E
RB
1
16
Y
2
15
3
14
4
13
5
12
6
11
7
10
8
9
POSITIVE X
Figure 26. Pixel Address Map (sensor looking on the navigation surface through the lens)
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PixArt Imaging Inc.
ADNS-7550 Integrated Molded Lead-Frame DIP Sensor
H_RESOLUTION
Address: 0x36
Access: Read/Write
Reset Value: 0x04
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
H_RES_EN
H_RES2
H_RES1
H_RES0
0
Data Type
: Bit field
USAGE : This register is used to set the resolution configuration of sensor up to 2000cpi. For resolution setting at
1600cpi and below, configuration via Configuration_Bits register, 0x12 is still effective when H_RES_EN bit is set to
zero.
Field Name
Description
H_RES_EN
0 = Resolution setting will follow the value as per configuration in Configuration_Bits register, 0x12
1 = Enabled high resolution up to 2000cpi. Resolution setting will follow the configuration
as per H_RES2-0 bits in this register and setting in register 0x12 will be ignored.
H_RES2-0
Resolution in count per inch (cpi)
001 = 400
010 = 800
011 = 1200
100 = 1600
101 = 2000
Bit-0
Must be zero value
POWER_UP_RESET
Address: 0x3a
Access: Write
Reset Value: NA
Bit
7
6
5
4
3
2
1
0
Field
RST7
RST6
RST5
RST4
RST3
RST2
RST1
RST0
Data Type: 8 Bit integer
USAGE: Write 0x5a to this register to reset the chip. All settings will revert to default values. Reset is required after
recovering from shutdown mode.
SHUTDOWN
Address: 0x3b
Access: Write Only
Reset Value: NA
Bit
7
6
5
4
3
2
1
0
Field
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
Data Type: 8 Bit integer
USAGE: Write 0xe7 to set the chip to shutdown mode, use POWER_UP_RESET register (address 0x3a) to power up the
chip.
Reserved
Address: 0x3c
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Shut_thr
Address: 0x3d
Access: Read/Write
Reset Value: 0x56
Bit
7
6
5
4
3
2
1
0
Field
Shut_thr7
Shut_thr6
Shut_thr5
Shut_thr4
Shut_thr3
Shut_thr2
Shut_thr1
Reserved
Data Type: 7 Bit number
USAGE: Threshold defines the Shutter value when lifted runaway happens.
Sensor will suspect lifted runaway happens and suppress motion if (Shutter > Shut_thr[7:1]*32).
Inverse_Revision_ID
Address: 0x3e
Access: Read
Reset Value: 0xfc
Bit
7
6
5
4
3
2
1
0
Field
NRID7
NRID6
NRID5
NRID4
NRID3
NRID2
NRID1
NRID0
Data Type: Inverse 8-Bit unsigned integer
USAGE: This value is the inverse of the Revision_ID. It can be used to test the SPI port.
Inverse_Product_ID
Address: 0x3f
Access: Write Only
Reset Value: 0xcd
Bit
7
6
5
4
3
2
1
0
Field
NPID7
NPID6
NPID5
NPID4
NPID3
NPID2
NPID1
NPID0
Data Type: Inverse 8-Bit unsigned integer
USAGE: This value is the inverse of the Product_ID. It can be used to test the SPI port.
Motion_Burst
Address: 0x42
Access: Read
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
MB7
MB6
MB5
MB4
MB3
MB2
MB1
MB0
Data Type: Various
USAGE: Read from this register to activate burst mode. The sensor will return the data in the Motion register, Delta_X_L,
Delta_Y_L, Delta_XY_H, Squal, Shutter_Upper, Shutter_Lower and Maximum_Pixel. Reading the first 3 bytes clears the
motion data. The read may be terminated anytime after Delta_X is read.
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