ADBS-A350
Optical Finger Navigation
Data Sheet
Description
Features
The ADBS-A350 sensor is a small form factor (SFF) LED
illuminated optical finger navigation system. It is a lowpower optical finger navigation sensor with low-power
architecture and automatic power management modes,
making it ideal for battery-and power-sensitive applications such as mobile phones.
Low power architecture
The ADBS-A350 is capable of high-speed motion detection
– up to 20 ips. In addition, it has an on-chip oscillator and
integrated LED to minimize external components.
Self-adjusting frame rate for optimum performance
There are no moving parts, thus provide high reliability and less maintenance for the end user. In addition,
precision optical alignment is not required, facilitating
high volume assembly.
The sensor is programmed via registers through either a
serial peripheral interface or a two wire interface port. It is
packaged in a 28 I/O surface mountable package.
The ADBS-A350 is designed for use with ADBL-A321 lens.
The ADBL-A321 lens is the optical component necessary
for proper operation of the sensor.
Theory of Operation
The ADBS-A350 is based on Optical Finger Navigation
(OFN) Technology, which measures changes in position by
optically acquiring sequential surface images (frames) and
mathematically determining the direction and magnitude
of movement.
The ADBS-A350 contains an Image Acquisition System
(IAS), a Digital Signal Processor (DSP), and a communication system.
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 x and y relative displacement values.
The host reads the x and y information from the sensor
serial port if a motion interrupt is published. The microcontroller then translates the data into cursor navigation,
rocker switch, scrolling or other system dependent navigation data.
Surface mount technology (SMT) device
Self-adjusting power-saving modes for longer battery
life
High speed motion detection up to 20 ips
Motion detect interrupt
Finger detect interrupt
Soft click and Tap detect interrupt
Single Interrupt pin
Optional PWM output for LED illumination
Optional switch input for center click function
Internal oscillator – no clock input needed
Selectable 125, 250, 500, 750, 1000 and 1250 cpi
resolution
Single 1.8 V supply voltage for analog and digital
Internal power up reset (POR)
Selectable Input/Output voltage at 1.8 V or 2.8 V nominal
4-wire Serial peripheral interface (SPI) or Two-wire
interface (TWI)
Integrated chip-on-board LED with wavelength of
870 nm
Applications
Finger input devices
Mobile devices
Integrated input devices
Battery-powered input device
Avago customers purchasing the ADBS-350 OFN
product are eligible to receive a royalty free license
to our US patents 6977645, 6621483, 6950094,
6172354 and 7289649, for use in their end products.
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.
Pinout of ADBS-A350 Optical Sensor
Pin Name
Description
Input/Output pin
1
GND
Ground
2
XY_LED
XY LED driver connection
3
EVENT_INT
Event Interrupt
(active low output)
O (CMOS output)
Open when not used
Default active low signal, can be changed in
Event control register 0x1d
4
GPIO
General Purpose Input/
Output
I (Schmitt trigger input)/
O (CMOS output)
Pin can be used for FPD output, PWM output
or Dome/ Button click input. If configure as
input do not leave pin unconnected
5
VDDIO
Voltage supply for Input/
Output pins
6
IO_MOSI_A0
TWI address set or
Master Out Slave In
I (Schmitt trigger input)
SPI : MOSI (Master Out Slave In) signal
TWI Address Select, A0
Do no leave pin unconnected
7
IO_CLK
Serial clock input
I (Schmitt trigger input)
Serial clock signal
8
IO_MISO_SDA
TWI serial data or
Master In Slave Out
In SPI – CMOS output.
In TWI – open drain I/O
SPI : MISO (Master Input Slave Out) signal
TWI : serial data signal
9
IO_NCS_A1
TWI address set or
Chip Select
I (Schmitt trigger input)
SPI : NCS (chip select) active low signal
TWI Address Select, A1
Do no leave pin unconnected
10
NRST
Hardware Chip Reset
I (Schmitt trigger input)
Set to high when not used
Active low signal
11
GND
Ground
12
NC
No Connect
13
SHTDWN
Shutdown
(active high input)
14
VDDIO
Voltage supply for I/O
15
IO_SELECT
SPI / TWI Select
16
NC
No Connect
No connection
17
NC
No Connect
No connection
18
NC
No Connect
No connection
19
NC
No Connect
No connection
20
VDD
Voltage supply
Supply 1.8 V
21
GND
Ground
22
GND
Ground
23
NC
No Connect
No connection
24
LED-
LED Cathode
Must connect to XY_LED
25
LED-
LED Cathode
Must connect to XY_LED
26
LED-
LED Cathode
Must connect to XY_LED
27
LED+
LED Anode
Provide 1.8 V supply voltage
28
GND
Ground
Must connect to LED(see schematics Figure 7a, 7b)
Supply 1.8 V or 2.8 V
No connection
I (Schmitt trigger input)
Set to low when not used
Active high signal
Sets I/O voltage
I (Schmitt trigger input)
Note:
1. NC pins can be tied to VDD, GND or left open/ unconnected.
2
Function
TWI : GND or SPI : High
X350
XYYWWZ
28: GND
27: LED+
26: LED-
25: LED-
24: LED-
23: NC
22: GND
PIN 22
PIN 1
GND :21
1: GND
VDD :20
2: XY-LED
NC :19
3: EVENT_INT
NC :18
4: GPIO
NC :17
5: VDDIO
NC :16
6: IO_MOSI_AO
7: IO_CLOCK
IO_SELECT :15
9: IO_NCS_A1
8: IO_MISO_SDA
10: NRST
11: GND
12: NC
Note:
X350 = A350
XYYWWZ, where YY = last 2 digits of year, WW = work week
13: SHTDWN
14: VDDIO
PIN 8
PIN 15
28X
0.35
0.014
Figure 1. Package outline drawing
Pin # 1
1
6.00 ± 0.08
0.236 ± 0.003
4.10 ± 0.07
0.161 ± 0.003
2.05
0.081
0.95
0.037
3
1.45 ± 0.075
0.057 ± 0.003
0.70 ± 0.05
2Xø
0.028 ± 0.002
0.65
0.026
0.45
0.018
1.15
0.045
2
6.00 ± 0.08
0.236 ± 0.003
Pin # 1
2.16
3.14 ± 0.07
0.085 0.123 ± 0.003
0.20
2X
0.008
2X R
1.00
0.039
X350
XYYWWZ
Optical Center
2X
3
3.00
0.118
ø 0.66
0.026
3.20
0.126
6.33
0.249
Product Marking
Figure 2. Package outline drawing
2.60
0.102
Overview of Optical Sensor Assembly
Soldering Profile
Avago Technologies provides an IGES file drawing describing the cover plate molding features.
The recommended soldering profile is shown below.
tp
TP
The components interlock as they are mounted onto
defined features on the cover plate.
The lens provides optics for the imaging of the surface as
well as illumination of the surface at the optimum angle.
Features on the lens align it to the sensor and cover plate.
Contamination must be kept away from the lens. During
assembly process, it is recommended to use a minimum
of a 10K clean room environment or equivalent laminar
flow workbench.
Temperature (°C)
TL
The ADBS-A350 sensor is designed for surface mounting
on a PCB, looking up. There is an aperture stop and
features on the package that align to the lens.
Tc -5°C
Max. Ramp - Up Rate = 3°C/sec
Max Ramp - Down Rate = 6°C/sec
Tsmax
Preheat Area
t
Tsmin
ts
25
Time 25°C to Peak
Time (second)
Figure 3a. Recommended reflow profile
PCB Assembly Considerations
1. Surface mount the sensor and all other electrical components into PCB.
2. Reflow the entire assembly in a no-wash solder
process.
3. Remove the protective kapton tape from optical aperture of the sensor and LED. Care must be taken to
keep contaminants from entering the aperture. Recommend not to place the PCB facing up during the
entire assembly process. Recommend to hold the PCB
first vertically for the kapton removal process.
4. Press fit the lens onto the sensor until there is no gap
between the lens and sensor, with force up to maximum 2.2 kgf. Care must be taken to avoid contaminating or staining the lens. The lens piece has alignment
posts which will mate with the alignment holes on the
sensor package.
Figure 3b. Recommended Customer’s PCB PADOUT and spacing
5. Place and secure the optical navigation cover onto the
lens to ensure the sensor and lens components are
always interlocked to the correct vertical height. The
cover design has a foolproof feature to avoid wrong
orientation of the cover.
6. The optical position reference for the PCB is set by the
navigation cover and lens.
7. Install device top casing. There MUST be a feature in
either top casing or bottom casing to press onto the
sensor to ensure the sensor and lens components are
always interlocked to the correct vertical height.
Profiling Information
Max rising slope
0.0°C/sec to 3°C/sec
Preheat time 150 – 200° C, ts
60 – 90 sec
Time above Reflow (TL = 220° C)
50 – 100 sec
Peak Temperature
225 – 260° C
Figure 3c. Recommended Customer’s PCB PADOUT and spacing
4
As ADBS-A350 is a QFN package, it is meant to be a contactdown package. The critical area for soldering ADBS-A350
is on the terminal undersides, while the terminal sides are
deemed as non-critical area, and thus not intended to be
wet-table. The non-wetting of the terminal sides is due to
exposed copper on the package side (which is expected
and accepted), occurred after the singulation step, which
is a standard process in QFN assembly. This is in line with
the Industry Standard (for more information, please refer
to IPC-A-610D: Acceptability of Electronics Assemblies).
Figure 3d. Bottom view of A350 (QFN package)
Cross sectional views of one terminal side
Figure 3e. Cross sectional views of A350
Critical and Non-critical areas of QFN soldering in Figure 3d and 3e
Feature
Dimension
Class 1
Class 2
Class 3
Maximum Side Overhang
A
50% W, Note 1
25% W, Note 1
25% W, Note 1
Minimum End Joint Width
C
50% W
75% W
75% W
Minimum Side Joint Length
D
Note 4
Note 4
Note 4
Minimum Fillet Height
F
Notes 2, 5
Notes 2, 5
Notes 2, 5
Solder Fillet Thickness
G
Note 3
Note 3
Note 3
Termination Height
H
Note 5
Note 5
Note 5
Land Width
P
Note 2
Note 2
Note 2
Termination Width
W
Note 2
Note 2
Note 2
Notes
1. Should not violate minimum electrical clearance.
2. Unspecified parameter. Variable in size as determined by design.
3. Good wetting is evident.
4. Is not a visual attribute for inspection.
5. Terminal sides are not required to be solderable. Toe fillets are not required.
5
Figure 4. 2D Assembly drawing of ADBS-A350
Figure 5a. Exploded Top view
6
NAVIGATION COVER
NAVIGATION COVER
OPTICAL LENS
OPTICAL LENS
SENSOR PACKAGE
SENSOR PACKAGE
Figure 5b. Exploded Bottom view
8.05
0.34
A
A
8.70
R 0.10
Iso 1
Top 1
6.27
R 0.10
Around Edge
Right 1
ø 3.00
see Detail 1
T ±0.02
Optical Surface
R 0.09
4.98 +0.05
0
No Draft
0.45
0
0.40 -0.10
B
SECTION A-A
3 X R0.5
1. Recommended Material:
Panlite® L-1225R HF05084R
Emerge-PC-4310-OPQ
Makrolon 2405
Lexan 21051
2. Cosmetic requirements on all surface shall
be SPI-D3 finish, unless otherwise noted.
3. Formula for dimension, T = (0.9/n)-0.07
where n = Refractive Index
4. Mirror finish surface to be SPI-A2
0.35
5.72
5.50 +0.05
0
No Draft
6.89
3.81+0.1
0
Detail 1
Scale 30:1
5.09
0.78
C 0.10
Around Edge
10 X R0.10
0.87
Optical Surface
B
0.94
Bottom 1
SECTION B-B
45°
Iso 1
0
1.22 -0.1
1.22 ±0.03
Note: (Unless otherwise specified)
Figure 6a. Top cover drawing design
Important notes for top cover designs:
1. The recommended transmissivity of top cover window is between 86%-92% from 800nm to 940nm with worst case
minimum of 80% and maximum of 97% across this range of light spectrum.
2. The Assert/ Deassert thresholds must be recalculated and set in the sensor accordingly during initialization to
address variation of surface reflection and transmissivity for custom cover designs. (See OFN firmware application
note and OFN mechanical guide application note for further details).
Transmissivity vs Wavelength
100
90
Transmissivity (%)
80
Max 97%
92%
Min 80%
86%
70
60
50
40
30
20
10
0
400
450
500
550
600
650
700 750 800 850
Wavelength (nm)
900
950 1000 1050 1100
Figure 6b. Example of Transmissivity vs. Wavelength curve for standard Avago cover material
7
8
9
7
5
3
1
4
2
34
10
8
6
GND
X2
32.768KHz
GND
RST/NMI
P1.4
P1.5
P1.6
P1.7
TST
16 P3.5/RXD
15
P3.4/TXD
5
XOUT
6
IXIN
7
25
26
27
28
1
U1
LEFT_SW
2
GND
P1.0
P1.1
P1.2
P1.3
P2.5
P2.1
P2.2
P2.3
P2.4
P2.0
P3.0
P3.6
P3.7
21
22
23
24
3
9
10
19
20
8
11
17
18
C3
100nF/16V
0603
P3.2/MISO 13
P3.3/CLK 14
P3.1/MOSI 12
GND
VDD1.8
RIGHT_SW
2
R5
100k 1%
0603
VDD2
D1
GRN
0805
R9
1k
0603
15
10
4
3
13
8
6
7
9
GND
C3
10nF
IO_SELECT
NRST
GPIO
SHTDWN
EVENT_INT
IO_MOSI_A0
IO_CLK
IO_NCS_A1
IO_MISO_SDA
C2
1F
VDD1.8
GND
CN1
ADBS-A350
NC
Figure 7. Schematic diagram for interface between ADBS-A350 and 1.8 V microcontroller via SPI
Note: Dome + must be connected to MCU to detect button change state and Dome – can be connected to GND.
VDD1.8
GND
C1
10nF
R2
100k 1%
0603
SW3
1
SW2
1
R1
100k 1%
0603
VDD1.8
20
VDD
VDD1.8
2
VDD
1.8V microcontroller
VSS
4
GND
1
GND
11
GND
21
GND
22
GND
28
DATA -
V+
NC
GND
ID
DATA +
14
VDDIO
5
VDDIO
NC
12
NC
16
NC
NC
17
5
4
3
2
1
NC
NC
18
LED-
LED-
LED-
LED+
26
25
24
27
XY_LED 2
NC
NC NC
19
NC
23
C4
1F/16V
0805
D2
0805
R10
220R
0603
U3
BQ24200DGN
GND
VDD1.8
MSOP-8
1
IN
2
VCC
3
STAT
4
VSS
8
OUT
7
BAT
6
CE
5
N/C
C20
1F
0805
35
OUTPUT
U5
LP2989LV-1.8
C19
1F/16V
0805
C21
100nF
0603
1
1
2
2
1
3
SW6
D3
BAT54C
SOT23
GND
2
1
3
C22
4.7F/10V
0603
INPUT
2
VSS2
R20
51k 1%
0603
R19
51k 1%
0603
C23
100nF
0603
VSS2
C25
1nF
0603
Regulatory Requirements
Passes FCC or CISPR 22 Class B emission limits when
assembled
following
Avago
Technologies
recom-mendations.
Passes IEC 61000-4-3 and IEC61000-4-6 Class A
Immunity limits when assembled following Avago
Technologies recommendation.
Absolute Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Units
Storage Temperature
TS
-40
85
°C
260
°C
Lead Solder Temp
Moisture Sensitivity Level
MSL
Analog and Digital Supply Voltage
VDD
-0.5
2.1
1
V
I/O Supply Voltage
VDDIO
-0.5
3.7
V
LED Supply Voltage
VLED+
-0.5
2.1
V
2
kV
VDDIO+0.5
V
20
mA
ESD (sensor only)
-0.5
Input Voltage
VIN
Latchup Current
Iout
Notes
For 1.4 seconds
Referring to JEDEC-J-STD-020
All pins, human body model
JESD22-A114-E
All Pins
Note: 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 may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Minimum
Operating Temperature
TA
-20
Analog and Digital
Supply Voltage [1]
VDD
1.7
I/O Supply Voltage [2]
VDDIO
LED Supply Voltage
Power Supply Rise Time
Power Supply Off Time for
Valid POR (Power on Reset)
tOFF
10
Power Off Voltage Level for
Valid POR (Power on Reset)
VOFF
0
Typical
Maximum
Units
Notes
70
°C
1.8
2.1
Volts
Including VNA noise.
1.65
1.8 or 2.8
3.6
Volts
Including VNA noise. Sets I/O
voltages. See fig 7.
VLED+
1.7
1.8
2
Volts
Including VNA noise.
tVRT
0.001
10
ms
0 to VDD. At minimum rise time, s/’
ms
Refer to section “POR During Power
Cycling”
300
mV
Refer to section “POR During Power
Cycling”
Supply Noise (Sinusoidal)
VNA
100
mV p-p
10 kHz - 50 MHz
Speed
S
20
in/sec
Using prosthetic finger as surface
Transient Supply Current
IDDT
80
mA
Max supply current for 500 sec
for each supply voltages ramp from
0 to 1.8 V
Notes:
1. For operating temperature of less than -20°C down to -30°C, minimum VDD of 1.8V must be met.
2. To ensure minimum leakage current, VDDIO should be greater than or equal to VDD.
9
Timing Specifications
Electrical Characteristics at 25° C, VDD=VDDIO=1.8V.
Parameter
Symbol
Minimum
Typical
Motion Delay After Reset
tMOT-RST
3.5
Shutdown
tSHTDWN
Wake from Shutdown
tWAKEUP
EVENT_INT Rise Time
tr-EVENT_INT
150
EVENT_INT Fall Time
tf-EVENT_INT
150
Maximum
Units
Notes
23
ms
From Hard reset or SOFT_RESET
register write to valid register write/
read and motion, assuming motion
is present
50
ms
From SHTDWN pin active to low
current
ms
From SHTDWN pin inactive to valid
motion. Refer to section “Notes on
Shutdown”, also note tMOT-RST
300
ns
CL = 100 pF
300
ns
CL = 100 pF
100
SHTDWN Pulse Width
tP-SHTDWN
150
ms
NRST Pulse Width
tNRST
20
s
Reset Wait Time After Stable
Supply Voltage
tVRT-NRST
100
ms
From edge of valid NRST pulse
DC Electrical Specifications
Electrical Characteristics at 25° C, VDD=VDDIO=1.8V at default LED setting 13 mA.
Parameter
Typical
Max
Units
Notes
I VDD
1.56
2.13
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
IDD_LED+
1.34
1.90
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
Total
2.90
4.03
mA
DC average supply current in Rest1
mode
I VDD
0.2
0.3
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
IDD_LED+
0.15
0.20
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
Total
0.35
0.50
mA
DC average supply current in Rest2
mode
I VDD
0.04
0.07
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
IDD_LED+
0.03
0.05
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
Total
0.07
0.12
mA
DC average supply current in Rest3
mode
I VDD
0.02
0.04
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
IDD_LED+
0.01
0.02
mA
GPIO=SHTDWN=pull low, IO_MISO=NRST=pull high.
Total
0.03
0.06
mA
Supply current
during shutdown
IDDSHTDWN 1.54
VDD
26.00
A
GPIO=pull low, SHTDWN=IO_MISO=NRST=pull high.
LED current
during shutdown
IDDSHTDWN 0
VLED+
0.70
A
GPIO=pull low, SHTDWN=IO_MISO=NRST=pull high.
DC average supply current in Run mode
10
DC Electrical Specifications
Electrical Characteristics at 25° C, VDD=VDDIO=1.8V at default LED setting 13 mA.
Parameter
Symbol
VDDIO DC Supply Current
Minimum
Typical
Maximum
Units
I VDDIO
20
A
Digital peak supply current
IPEAK VDD
10
mA
LED+ peak supply current
IPEAK LED+
35
mA
Input Low Voltage
VIL
-0.05
Input High Voltage
VIH
VDDIO * 0.7 VDDIO
Input hysteresis
VHYS
100
Input leakage current
Ileak
Output Low Voltage
VOL
Output High Voltage
VOH
Input Capacitance
Cin
0
At LED register setting of 27 mA
VDDIO*0.35 V
IO_MOSI_A0, IO_CLK, IO_MISO_SDA,
IO_NCS_A1, NRST, SHTDWN,
IO_SELECT
VDDIO+0.05 V
IO_MOSI_A0, IO_CLK, IO_MISO_SDA,
IO_NCS_A1, NRST, SHTDWN,
IO_SELECT
mV
±1
VDDIO-0.2
Notes
±10
A
IO_MOSI_A0, IO_CLK, IO_MISO_SDA,
IO_NCS_A1, NRST, SHTDWN,
IO_SELECT
0.2
V
Iout = 1.2 mA
V
Iout = 600 A
pF
MOSI, NCS, SCLK, SHTDWN
VDDIO-0.1
10
Notes on Power-up Sequence
Below is the power up sequence for ADBS-A350:
For SPI:
For TWI:
1. Apply power. Refer timing diagram on power up
sequence below.
1. Apply power. Refer timing diagram on power up
sequence below.
2. Set IO_NCS_A1 pin high. Set SHTDWN pin low. Set IO_
SELECT pin high.
2. Set SHTDWN and IO_SELECT pin low.
3. Perform reset by driving NRST low then high OR by
writing 0x5A to address 0x3A.
4. Read Product ID (PID) to ensure sensor is powered up
and communicating properly with host.
5. Write 0xE4 to address 0x60
6. Write 0xC9 to address 0x61
3. Set A0 and A1 according to the desired TWI slave
address (from TWI slave address table in datasheet).
4. Drive NRST pin low then high. TWI slave address will
only be valid and according to the address set in step
3 after a NRST toggle is applied.
5. Read Product ID (PID) to ensure sensor is powered up
and communicating properly with host.
6. Write 0xE4 to address 0x60
7. Write 0xC9 to address 0x61
11
tVRT
VDD, VDDIO
tVRT-NRST
tNRST
Hard_reset condition
NRST signal
tMOT-RST
Hard reset condition
SPI/TWI signal
*SPI or TWI
transactions
tMOT -RST
tVRT-NRST
Write address
0x3A with 0x5A
for soft reset
*SPI transaction
Soft_reset condition
SPI signal
*SPI transactions
SHTDWN signal
IO_SELECT,
A1/A0 (TWI only)
Stable as per configurations
Note: Not to scale
Note on register settings
Please refer to the OFN A350 firmware design guide for
tuning of Speed Switching, Assert/De-assert, Finger
Presence Detect and XY Quantization register settings.
the SPI port. Reinitializing the sensor from shutdown state
will retain all register data that were written to the sensor
prior to shutdown.
Notes on Shutdown and Reset
The reset of the sensor via SOFT_RESET register or through
the NRST pin would reset all registers to the default value.
Any register settings must then be reloaded.
The ADBS-A350 can be set in Shutdown mode by asserting
or setting SHTDWN pin high. During the shutdown state,
supply voltages VDD must be maintained above the
minimum level. If these conditions are not met, then
the sensor must be restarted by powering down then
powering up again for proper operation. Any register
settings must then be reloaded.
During the shutdown state, supply voltage VDD must
be maintained above the minimum level. For proper
operation, SHTDWN pulse width must be at least tPSHTDWN. Shorter pulse widths may cause the chip to enter
an undefined state. In addition, the SPI or TWI port of the
sensor should not be accessed when SHTDWN is asserted.
Other devices 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.
After deasserting SHTDWN, wait tWAKEUP before accessing
12
Pin
SHTDWN active
IO_NCS_A1
Functional
IO_MISO_SDA
Undefined
IO_CLK
Undefined
IO_MOSI_A0
Undefined
XY_LED
Low current
EVENT_INT
Undefined
NRST
High
IO_Select
SPI: High, TWI: Low
GPIO
Undefined
Note: There are long wakeup times from shutdown. These features
should not be used for power management during normal sensor
motion.
Power on Reset (POR) During Power Cycling
tVRT is the power supply (VDD) rise time specification
for a valid power on reset to happen when the sensor is
powered up from 0V to VDD. At condition whereby the
VDD of the sensor is cycled from VDD to 0 V and then to
VDD again, the two parameters that govern a valid power
on reset are vOFF and tOFF. Refer to timing diagram below.
The EVENT_INT will be reset after the user responds to it
by reading the respective event status register:
FPD – reading FPD_STATUS register (0x7a)
Soft Click – reading SC_STATUS register (0x7f )
Button – reading BUTTON_STATUS register (0x12)
Motion – reading DELTA_X and DELTA_Y registers until
motion are cleared.
VDD
GPIO Pin
0V
The GPIO pin is a level-sensitive input/ output that can be
used as
tVRT
FPD output – to display FPD status
VDD
Pulse Width Modulated (PWM) output – to control LED
driver to enable illumination feature in a product eg
mobile phone
Figure 8. Power on Reset during power cycling
Dome/ Button click input – can be connected to a
dome switch that provides an input to the sensor
and when a click is detected, sensor can respond by
triggering button interrupt and channel the interrupt
status through EVENT pin.
Power management modes
Refer to A350 Firmware Design Guide for more details and
settings of registers for these features.
vOFF
0V
tOFF
tVRT
The ADBS-A350 has three power-saving modes. Each
mode has a different motion detection period, affecting
response time to sensor motion (Response Time). The
sensor automatically changes to the appropriate mode,
depending on 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)
Rest 1
19.5 ms
250 ms
Rest 2
96 ms
9.5 s
Rest 3
482 ms
582 s
EVENT_INT Pin
The Event_Int pin is a level-sensitive interrupt output that
is used to trigger the host micro-controller when one of
these events occurs:
FPD – A change in finger state (finger on to finger off
and vice versa) is detected
Soft Click – Soft Click is detected
Button – Mechanical button is asserted or de-asserted
Motion – Motion delta is present.
A read to event register is required to determine the
specific event that toggles the interrupt for user to act
upon.
13
LED Mode
For power savings, the LED will not be continuously on.
ADBS-A350 will flash the LED only when needed.
I/O Pin Status Test
This feature allows the user to verify the connectivity and
the state of the I/O pin.
To run the test for input pins such as GPIO, SHUTDOWN,
NRST and IO_SELECT, first enable the PAD_Chk_On bit
(or bit-1) of OFN_ENGINE2 (0x61) register. Then write
any value to PAD_STATUS (0x31) register to start the test.
Wait for approximately 12us before reading the actual pin
status and PAD_STATUS register. The test will be considered a PASS to indicate the sensor is responding accordingly if the actual pin status matches PAD_STATUS register
content. Refer to the table below for I/O pin status definition.
For output pins (EVENT_INT, GPIO, MOSI and MISO)
testing, first enable bit-4 of PAD_FUNCTION (0x34)
register. Then program or set the output state via PAD_
TEST_OUT register (0x33) and do a READ on the actual
pin status. Actual pin status results should match the
output set in PAD_TEST_OUT. (Note: SPI/TWI communication will be disabled after this test is enabled. Once this
test is completed, an external hardware reset on sensor is
required)
Bit(s)
Name
Reset
Description
Remarks
7:6
NRST_STATE
0x0
0x0: unknown
0x1: Low
Invalid as the chip will be in reset state.
5:4
3:2
1:0
SHUTDOWN_STATE
GPIO_STATE
IO_SELECT_STATE
0x0
0x0
0x0
0x2: High
0x3: Hi-Z
Indicate a floating high
0x0: unknown
0x1: Low
0x2: High
Invalid as the chip will be in shutdown state.
0x3: Hi-Z
Indicate a floating low
0x0: unknown
0x1: Low
0x2: High
0x3: Hi-Z
0x0: unknown
0x1: Low
0x2: High
0x3: Hi-Z
Fast Video Dump
FVD Commands
ADBS-A350 comes with a unique feature that enables user
to capture the image the optical sensor is seeing on the
tracking surface. This is achieved through storing the pixel
data, transferring or dumping the pixels data out to the
host for processing and rebuilding the video dump image.
The rebuilding of video dump image is mainly converting
each 8-bit pixel data to form a grayscale digital image.
1. Power up sensor
Some useful applications for this feature are sensor contamination inspection at manufacturing lines, image recognition, motion sensing applications and etc.
5. Write register 0x30 with 0x13
Fast Video Dump Setups and Commands
8. Write register 0x28 with 0x01 to initiate video dump.
Fast Video Dump (FVD) in the sensor requires three main
signal lines for communications with host MCU as shown
below.
Pin
Status
Description
GPIO
Input
24MHz clock signal
MISO_SDA
Output
Pixel data bits 7 to 4
EVENT_INT
Output
Pixel data bits 3 to 0
Connect an external clock signal of up to 24MHz to GPIO
pin. Execute the FVD commands below and capture the
64burst cycles of data clocked out on the two output pins
(MISO_SDA and EVENT_INT).
14
2. Read register 0x00, to get returned value of 0x88
for correct product ID (ensure communication with
sensor is established)
3. Write register 0x3a with 0x5a
4. Write register 0x11 with 0x53
6. Write register 0x2b with 0x30
7. Write register 0x2c with 0x13
9. Sensor will start to video dump for about 500ms (see
timing diagram on signals decoding versus actual
signal captured).
10. Once video dump is completed, write register 0x3a
with 0x5a to soft reset sensor back to normal operation.
(Note: During FVD, the sensor is in 3-wire SPI
communication with host MCU by design. Therefore
a soft reset is necessary to reset back to 4-wire SPI
communication for normal operation or to perform
another FVD)
11. To capture another 64 burst cycles, repeat Step
2- Step10.
Video Dump Signals Capturing and Decoding
64 burst cycles of FVD will be present on the MISO_SDA
and EVENT_INT pins after executing the fast video dump
commands.
Zooming into each burst cycle, 3 frames in each burst
cycle will be observed.
MISO_SDA 64 burst cycles (~500ms)
EVENT_INT
GPIO (CLOCK)
Figure 9. Signals for frame start
15
As shown in Figure 9 above, frame start of video dump is
denoted by MISO_SDA pin and EVENT_INT pin clocking
high for 4 clock cycles or 4 x b’11 (binary 11). Then after 4
clock cycles, MISO_SDA pin will go low and EVENT_INT pin
remains high. This indicates pixel begin state.
The pixel read data will start to clock thereafter. Subsequent 4 bits are D7-D4 (on MISO_SDA) and D3-D0 (on
EVENT_INT) followed by b’10 for pixel end (b’1 in MISO_
SDA, b’0 in EVENT_INT). This completes the first pixel data
(address 0). The next pixel data (address 1) will begin with
pixel begin state (b’01- 0 in MISO_SDA, 1 in EVENT_INT)
header followed by the 4 clock cycles of data followed by
a pixel end state in the same manner. This will continue
until all the 361 pixels (19x19 pixel array) data is read.
Once done, the pixel end of the pixel data (address 360)
will be followed by frame end state (b’00 – 0 in MISO_SDA,
0 in EVENT_INT). Refer to Figure 10.
Below is the pixel array address map. The figure shows the view of the chip from the top of the OFN aperture. Rows are
read from top to bottom and columns from left to right.
Pin 1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
Pin 18
The signal to indicate the end of the video dump frame is shown in Figure 10 below where pix end state is followed by a
low in both MISO_SDA and EVENT_INT. This will inform the Host of the pixel end and frame end state.
Figure 10. Frame End
Note: It is advisable to have a counter at the Host to keep count of the number of pixel addresses and data byte. If the number of pixel data byte does
not correspond to the sensor number of pixel then this video dump data is invalid. In this case the sensor must be reset and a new video dump must
be initiated.
Fast Video Dump Image
These are some examples of grayscale images captured
using fast video dump on an object ‘A’ (size of 1mmx1mm)
at the surface of the sensor that is converted from the fast
video dump data.
16
4-wire Serial Peripheral Interface (SPI)
SPI Specifications
Electrical Characteristics over recommended operating conditions. Typical values at 25° C, VDD = 1.8 V.
Parameter
Symbol
Maximum
Units
Notes
Serial Port Clock
Frequency
fsclk
1
MHz
Active drive, 50% duty cycle
MISO rise time
tr-MISO
MISO fall time
tf-MISO
150
300
ns
CL = 100 pF
150
300
ns
CL = 100 pF
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
μs
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
s
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
s
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
s
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 falling
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
ns
From NCS rising edge to MISO high-Z
state
17
Minimum
Typical
500
The synchronous serial port is used to set and read parameters in the ADBS-A350, and to read out the motion
information.
Chip Select Operation
MISO: Output data. (Master In/Slave Out)
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 events could be interpreted as serial communication and put the chip into an unknown state. In addition,
NCS must be raised after each burst-mode transaction
is complete to terminate burst-mode. The port is not
available for further use until burst-mode is terminated.
NCS:
Write Operation
The port is a four wire serial port. The host micro-controller
always initiates communication; the ADBS-A350 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 4-wire SPI port:
SCLK: Clock input. It is always generated by the master
(the micro-controller).
MOSI: Input data. (Master Out/Slave In)
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.
Write operation, defined as data going from the microcontroller to the ADBS-A350, 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 ADBS-A350 reads MOSI on rising edges of SCLK.
NCS
SCLK
MOSI
1
2
3
4
5
6
7
8
9
1
A6
A5
A4
A3
A2
A1
A0
D7
MISO
10
D6
11
D5
Do not care
MOSI Driven by Micro-Controller
Figure 11. Write Operation
SCLK
MOSI
tHold,MOSI
tsetup , MOSI
Figure 12. MOSI Setup and Hold Time
18
12
D4
13
D3
14
D2
15
D1
16
D0
1
2
1
A6
Read Operation
A read operation, defined as data going from the ADBS-A350 to the micro-controller, is always initiated by the microcontroller and consists of two bytes. The first byte contains the address, is sent by the micro-controller over MOSI, and
has a “0” as its MSB to indicate data direction. The second byte contains the data and is driven by the ADBS-A350 over
MISO. The sensor outputs MISO bits on falling edges of SCLK and samples MOSI bits on every rising edge of SCLK.
NCS
SCLK
Cycle #
1
2
3
4
5
6
7
A6
A5
A4
A3
A2
A1
8
9
10
11
12
13
14
15
16
D7
D6
D5
D4
D3
D2
D1
D0
SCLK
MOSI
0
MISO
Do not care
A0
tSRAD delay
Figure 13. Read Operation
SCLK
MISO
NOTE: The 0.5/fSCLK minimum high state of SCLK is also the minimum
MISO data hold time of the ADBS-A350. Since the falling edge of
SCLK is actually the start of the next read or write command, the
ADBS-A350 will hold the state of data on MISO until the falling edge
of SCLK.
tHOLD-MISO
tDLY-MISO
D0
tr-MISO
tf-MISO
Figure 14. MISO Delay and Hold Time
Required timing between Read and Write Commands
There are minimum timing requirements between read and write commands on the serial port.
tSWW
SCLK
Address
Data
Write Operation
Address
Data
Write Operation
Figure 15. 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
Write Operation
Figure 16. Timing between write and read commands
19
Address
Next Read
Operation
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 & tSRR
tSRAD
SCLK
Address
Data
Read Operation
Address
Next Read or
Write Operation
Figure 17. 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
ADBS-A350 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 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 writing 0x10 to register 0x1c
IO_MODE. Then the burst mode data can be read by
reading the Motion register 0x02. The ADBS-A350 will
respond with the contents of the Motion, Delta_Y, Delta_X,
SQUAL, Shutter_Upper, Shutter_Lower and Maximum_
Pixel registers in that order. The burst transaction can be
terminated after the first 3 bytes of the sequence are read
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
is 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 Register Address
Read First Byte
First Read Operation
Figure 18. Motion Burst Timing
20
Read Second Byte
Read Third Byte
Two – Wire Interface (TWI)
ADBS-A350 uses a two-wire serial control interface compatible with I2C. The parameters are listed below.
TWI Specifications
Electrical Characteristics over recommended operating conditions. Typical values at 25° C, VDD = 1.8 V.
Parameter
Symbol
SCL clock frequency
fscl
Hold time (repeated) START condition. After this period,
the first clock pulse is generated
tHD_STA
LOW period of the SCL clock
HIGH period of the SCL clock
Minimum
Maximum
Units
400
kHz
0.6
–
s
tLOW
1.0
–
s
tHIGH
0.6
–
s
Set up time for a repeated START condition
tSU_STA
0.6
–
s
Data hold time
tHD_DAT
0(2)
0.9(3)
s
Data set-up time
tSU_DAT
100
–
ns
Rise time of both SDA and SCL signals
tr
20+0.1Cb(4)
300
ns
Fall time of both SDA and SCL signals
tf
20+0.1Cb(4)
300
ns
Set up time for STOP condition
tSU_STO
0.6
–
s
Bus free time between a STOP and START condition
tBUF
1.3
–
s
Capacitive load for each bus line
Cb
–
400
pF
Noise margin at the LOW level for each connected device
(including hysteresis)
VNL
0.1 VDD
–
V
Noise margin at the HIGH level for each connected device
(including hysteresis)
VNH
0.2 VDD
Notes
V
Notes:
1. All values referred to VIHMIN and VILMAX levels.
2. A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the VIHMIN of the SCL signal) to bridge the undefined
region of the falling edge of SCL.
3. The maximum has tHD_DAT only to be met if the device does not stretch the LOW period (tLOW ) of the SCL signal.
4. CB = total capacitance of one bus line in pF.
The ADBS-A350 responds to one of the following selectable slave device addresses depending on the IO_MOSI_
A0 and IO_NCS_A1 input pin state. These pins should be
set to avoid conflict with any other devices that might be
sharing the bus.
Table 1. TWI slave address
A0
A1
Slave Address (Hex)
0
0
33
0
1
3b
1
0
53
1
1
57
Serial Transfer Clock and Serial Data signals
The serial control interface uses two signals: a serial
transfer clock (SCL) signal and a serial data (SDA) signal.
Always driven by the master, SCL synchronizes the serial
transmission of data bits on SDA. The frequency of SCL
may vary throughout a transfer, as long as the timing is
greater than the minimum timing.
SDA is bi-directional. The host (master) can read from or
write to the ADBS-A350. The host (typically a microcontroller) drives SCL and SDA in a write operation or requesting information from the ADBS-A350. The ADBS-A350
drives the SDA only under two conditions. First, when responding with an acknowledge (ACK) bit after receiving
data from the host, or second, when sending data to the
host at the host’s request. Data is sent in Eight-bit packets.
Start and Stop of Synchronous Operation
The host initiates and terminates all data transfers. Data
transfers are initiated by driving SDA from high to low
while holding SCL high. Data transfers are terminated by
driving SDA from low to high while SCL is held high.
21
START Condition
STOP Condition
SDA falls while
SCL is high
SDA rises while
SCL is high
SCL driven
by host
SDA driven
by host
Figure 19. TWI Start and Stop operation
Acknowledge/Not Acknowledge Bit
After a start condition, a single acknowledge/not acknowledge bit follows each Eight-bit data packet. The device
receiving the data drives the acknowledge/not acknowledge signal on SDA. Acknowledge (ACK) is defined as 0 and not
acknowledge (NAK) is defined as 1.
Packet Formats
Read and write operations between the host and the ADBS-A350 use three types of host driven packets and one type of
ADBS-A350 driven packet. All packets are eight bits long with the most significant bit first, followed by an acknowledge
bit.
Slave Device Address (DA)
Command packets contain a 7-bit ADBS-A350 device address and an active low read/write bit (R/W).
Last bit of
packet
First bit of
packet
Device Address
DA[6]
DA[5]
DA[4]
DA[3]
R/W
DA[2]
DA[1]
DA[0]
Write = 0
Read = 1
Register Address Packets (RA)
The address packets contain an auto-increment (ai) bit and a 7-bit address. If the ‘ai’ bit is set, the slave will process data
from successive addresses in successive bytes. For example, registers 0x01, 0x02, and 0x03 can be written by setting
the ‘ai’ bit to one with address 0x01. The host would send three bytes of data, and the host would terminate with a P
condition.
First bit of
packet
Last bit of
packet
Auto
increment
Auto
increment=1,
No
increment=0
22
Register Address
RA[6]
RA[5]
RA[4]
RA[3]
RA[2]
RA[1]
RA[0]
Data Packet (DP)
Contains 8 data bits and may be sent by the host or the ADBS-A350.
Last bit of
packet
First bit of
packet
Data
DP[7]
DP[6]
DP[5]
DP[4]
DP[3]
DP[2]
DP[1]
DP[0]
Host Driven Packets
The host initiates all data transmission with a START
condition. Next, slave address and register address packets
are sent. If there is a device address match, the ADBS-A350
then responds to each Eight-bit data transmission with an
acknowledge signal (SDA = 0). Data is transmitted with
the most significant bit first.
Start
7
6–1
0
ACK
7
D7
D6–D1
D0
ACK
D7
To terminate the transfer of host driven packets, the host
follows the ADBS-A350’s ACK with a STOP condition. The
host can also issue a START condition after the ADBSA350’s ACK if it wants to start a new data transfer.
6–1
0
STOP or
START
ACK Condition
SCL driven
by host
SDA
Host Driven
Packet
Module must respond after each
data byte with a 1-bit 0-valued
acknowledge (ACK)
Not acknowledging (NAK)
signals indicate an error
condition
Figure 20. Host packets
23
ADBS
Driven
D0
Host Driven
Packet
ACK
ADBS
Driven
Host terminates data
transmission by following
the ACK with a STOP
condition or another
START condition
Host
Driven
ADBS-A350 Driven Packets
By request of the host, the ADBS-A350 acknowledges a read request and then outputs a data byte transmitting the most
significant bit (7) first. If the host intends to continue the data transfer, the host acknowledges the ADBS-A350. If the host
intends to terminate the transfer, it responds with not acknowledge (SDA = 1), and then drives SDA to generate a STOP
condition. The host can also drive a START condition if it wants to begin a new data transfer with the same ADBS-A350.
ACK
7
6–1
0
ACK
7
6–1
0
NAK
D7
D6–D1
D0
ACK
D7
D6–D1
D0
NAK
STOP or
START
Condition
SCL driven
by host
SDA
ADBS Driven
Packet
Host
Driven
ADBS Driven
Packet
Host
Driven
The host terminates data
transmission by responding
with a not acknowledge
(NAK), followed by a STOP
condition or another START
condition
If the host responds with
an acknowledge (ACK),
the ADBS sends another
data byte
Figure 21. Sensor packets
Example: Writing Data to Sensor Registers
The host writes a value of 0x02 to address 0x07 in the following illustration.
The example ADBS-A350 address is 0x57.
ADBS
Address
0 x 57
Register
Address
0 x 07
Data
0 x 02
Packet
Number
1
2
3
Packet
type
DA
RA
DP
7
SDA
host
START
1010111
0
7
0
0
R/W
SDA
ADBS
Figure 22. TWI write
24
0
7
0000111
0
00000010
STOP
ai
ACK
ACK
ACK
Example: Single Byte Read from Sensor Register
The sensor reads a value 0x01from the register address 0x02 in the following illustration. Again, the example ADBS-A350
address is 0x57.
ADBS
Address 0 x 57
Register Address
0 x 02
Packet
number
1
2
Packet
type
DA
RA
7
SDA
host
START
0
7
1010111 0
R/W
SDA
ADBS
ai
ACK
ADBS
Address 0 x 57
Packet
number
Data 0 x 01
4
DA
7
host
START
DP
0
1010 111 1
NAK
R/W
SDA
ADBS
Figure 23. TWI single byte read
25
ACK
3
Packet
type
SDA
0
0 0000010
7
ACK
0
00000001
STOP
Host could
also drive
another
START
condition
instead of a
STOP
condition
Example: Polling of Status register (X-Y Motion Bit and Button bits)
To poll the STATUS register, the following structure can be used:
ADBS
Address 0 x 57
Packet
number
Packet
type
1
2
DA
RA
7
SDA
host
START
Register
Address 0 x 02
0
1010111 0
0 0000010
R/W
SDA
ADBS
ai
ACK
Packet
number
Packet
type
host
START
ADBS
STATUS
register
3
4
5
DA
DP
DP
ACK
1010111 1
R/W
SDA
ADBS
ACK
ADBS
STATUS
register
ADBS Address
0 x 57
SDA
0
7
7
ACK
0
00000000
NAK
7
0
00010001
Host could
also drive
another
START
STOP condition
instead of a
STOP
condition
Figure 24. TWI polling
In this case, the host read ADBS-A350 data packets until the update bit (bit 4). Then the host could read successive
registers using the ai bit example below.
Note: polling the Status register rather than using the DATA_RDY pin increases power consumption
26
Example: Multiple-Byte Read from Sensor Register using ‘ai’ bit
The ai is a useful feature, especially in the case of reading Delta_X, Delta_Y, and Delta_HI in succession once either the
DATA_RDY interrupt pin and/or update bit in the STATUS register bit are set.
Once the ai bit is set, the slave will deliver data packets from successive addresses until the ‘STOP’ condition from the
host.
In the example below, 3 bytes are read successively from registers 0x03, 0x04, and 0x05.
ADBS Address
0 x 57
Packet
number
Packet
type
SDA
host
Register Address
0 x 03
1
2
DA
RA
7
0
START 1010111 0
7
0
1 0000011
R/W
SDA
ADBS
ACK
Packet
number
Packet
type
SDA
host
ai
START
ADBS
Address 0 x 57
ADBS Data
from address
0 x 03
ADBS Data
from address
0 x 04
ADBS Data
from address
0 x 05
3
4
5
6
DA
DP
DP
DP
7
0
1010111 1
ACK
R/W
SDA
ADBS
Figure 25. TWI ai bit
27
ACK
7
ACK
0
10101101
ACK
7
0
00000001
10000101
Host could
also drive
another
START
NAK STOP condition
instead of a
STOP
condition
SCL and SDA Timing
SDA driven after the
falling edge of SCL
SDA sampled after the
rising edge of SCL
SCL driven
by host
SDA driven
by host
or ADBS
Clock Low
Clock High
SCL driven
by host
SDA driven
by host
or ADBS
Data Hold time
Figure 26. TWI SCL and SDA Timing
ADBS-A350 driven SDA
SCL driven
by host
SDA driven
by host
Data Set-up time
(minimum 0 ns)
Figure 27. Sensor driven SDA
28
Data Propagation time
Registers
The ADBS-A350 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.
Read/
Write
Default
Value
Read/
Write
Default
Value
R/W
0x84
OFN_Engine2
R/W
0x89
Resolution
R/W
0x22
Speed_Ctrl
R/W
0x0e
0x64
Speed_ST12
R/W
0x08
0x65
Speed_ST21
R/W
0x06
Address
Register
Address
Register
0x00
Product_ID
R
0x88
0x40-0x5f
Reserved
0x01
Revision_ID
R
0x00
0x60
OFN_Engine1
0x02
EVENT
R/W
Any
0x61
0x03
Delta_X
R
Any
0x62
0x04
Delta_Y
R
Any
0x63
0x05
SQUAL
R
Any
0x06
Shutter_Upper
R
Any
0x07
Shutter_Lower
R
Any
0x66
Speed_ST23
R/W
0x40
0x08
Maximum_Pixel
R
Any
0x67
Speed_ST32
R/W
0x08
0x09
Pixel_Sum
R
Any
0x68
Speed_ST34
R/W
0x48
0x0a
Minimum_Pixel
R
Any
0x69
Speed_ST43
R/W
0x0a
0x0b
Pixel_Grab
R/W
Any
0x6a
Speed_ST45
R/W
0x50
0x0c
CRC0
R
0x00
0x6b
Speed_ST54
R/W
0x48
0x0d
CRC1
R
0x00
0x6c
GPIO_CTRL
R/W
0x80
0x0e
CRC2
R
0x00
0x6d
AD_CTRL
R/W
0xc4
0x0f
CRC3
R
0x00
0x6e
AD_ATH_HIGH
R/W
0x3a
0x10
Self_Test
W
0x00
0x6f
AD_DTH_HIGH
R/W
0x40
0x70
AD_ATH_LOW
R/W
0x35
R/W
0x00
0x71
AD_DTH_LOW
R/W
0x3b
0x11
Reserved
0x12
BUTTON_STATUS
0x13
Run_Downshift
R/W
0x04
0x72
QUANTIZE_CTRL
R/W
0x99
0x14
Rest1_Period
R/W
0x01
0x73
XYQ_THRESH
R/W
0x02
0x15
Rest1_Downshift
R/W
0x1f
0x74
MOTION_CTRL
R/W
0x00
0x16
Rest2_Period
R/W
0x09
0x75
FPD_CTRL
R/W
0xfa
0x17
Rest2_Downshift
R/W
0x2f
0x76
FPD_THRESH
R/W
0x2c
0x18
Rest3_Period
R/W
0x31
0x77
ORIENT_CTRL
R/W
0x00
0x19
Reserved
0x78
FPD_SQUAL_THRESH
R/W
0x40
0x1a
LED_CTRL
0x79
FPD_VALUE
R/W
0x00
0x7a
FPD_STATUS
R
0x20
0x7b
SC_CTRL
R/W
0x25
R/W
0x00
R/W
0x00
0x1b
Reserved
0x1c
IO_Mode
0x1d
EVENT_CTRL
R/W
0x04
0x7c
SC_T_TAPNHOLD
R/W
0x45
0x28
Fast_Video_Dump
R/W
0x00
0x7d
SC_T_DOUBLE
R/W
0x1e
0x2e
Observation
R/W
Any
0x7e
SC_DELTA_THRESH
R/W
0x19
0x31
Pad_Status
R
0x00
0x7f
SC_STATUS
R/W
0x00
0x32
Reserved
0x33
Pad_Test_Out
RW
0x00
0x34
Pad_Function
W
0x00
0x3a
SOFT_RESET
W
0x00
0x3b
Shutter_Max_Hi
R/W
0x0b
0x3c
Shutter_Max_Lo
R/W
0x71
0x3d
Reserved
0x3e
Inverse_Revision_ID
R
0xFF
0x3f
Inverse_Product_ID
R
0x77
29
Product_ID
Access: Read
Address: 0x00
Reset Value: 0x88
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 ADBS-A350. The value in this register does not
change; it can be used to verify that the serial communications link is functional.
Revision_ID
Access: Read
Address: 0x01
Reset Value: 0x00
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.
30
EVENT
Access: Read/Write
Address: 0x02
Reset Value: Any
Bit
7
6
5
4
3
2
1
Field
MOT
PIXRDY
PIXFIRST
OVFL
RESET_ST
BUT_CLICK
SOFT_CLICK FPD
0
Data Type: Bit field.
USAGE: Event detect register (0x02) allows user to determine if any event interrupts (FPD, Motion, Soft click or Button
click) 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_Y and Delta_X registers.
Writing anything to this register clears the MOT and OVFL bits, Delta_Y and Delta_X registers. The written data
byte is not saved.
Internal buffers can accumulate more than eight bits of motion for X or Y. If any of the internal buffers overflow,
then absolute path data is lost and the OVFL bit is set. This bit is cleared once some motion has been read from
the Delta_X and Delta_Y registers, and if the buffers are not at full scale. Since more data is present in the buffers,
the cycle of reading the Event, Delta_X and Delta_Y registers should be repeated until the motion bit (MOT) is
cleared. If the Event register has not been read for long time, at 500 cpi it may take up to 16 read cycles to clear
the buffers, at 1000 cpi, up to 32 cycles. To clear an overflow, write anything to this register.
The PIXRDY bit will be set whenever a valid pixel data byte is ready and available in the Pixel_Dump register.
Check that this bit is set before reading from Pixel_Dump. 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 and Delta_Y registers
Bit reset when motion data in Delta_X and Delta_Y registers are cleared
PIXRDY
Pixel Dump data byte is available in Pixel_Dump register
0 = data not available
1 = data available
PIXFIRST
This bit is set when the Pixel_Grab register is written to or when the 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, Y and/or X buffer has overflowed since last report
0 = no overflow
1 = Overflow has occurred
RESET_ST
Reset status bit. Any internal or external reset will set this bit. Write anything to
this register to clear it.
0 = No reset
1 = Reset occurred
BUT_CLICK
Button click report
0 = No Button click
1 = Button click occurred
Bit clear or reset by reading BUTTON_STATUS (0x12) register
SOFT_CLICK
Soft click report
0 = No Soft click
1 = Soft click occurred
Bit clear or reset by reading SC_STATUS (0x7F) register
FPD
Finger presence detect bit reports a change in finger state (finger on to finger
off and vice versa)
0 = No finger state change detected
1 = Finger state change detected
Bit clear or reset by reading FPD_STATUS (0x7A) register
31
Delta_X
Access: Read
Address: 0x03
Reset Value: Any
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: X movement is counts since last report. Absolute value is determined by resolution. Reading clears the register.
Motion
-127
-2
-1
0
+1
+2
+126
+127
Delta_X
81
FE
FF
00
01
02
7E
7F
NOTES: Avago RECOMMENDS that registers 0x03 and 0x04 be read sequentially.
Delta_Y
Access: Read
Address: 0x04
Reset Value: Any
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: Y movement is counts since last report. Absolute value is determined by resolution. Reading clears the register.
Motion
-127
-2
-1
0
+1
+2
+126
+127
Delta_X
81
FE
FF
00
01
02
7E
7F
NOTES: Avago RECOMMENDS that registers 0x03 and 0x04 be read sequentially.
SQUAL
Access: Read
Address: 0x05
Reset Value: Any
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 167. Since small changes in the current frame can result in changes in
SQUAL, variations in SQUAL when looking at a surface are expected.
32
Shutter_Upper
Access: Read
Address: 0x06
Reset Value: Any
Bit
7
6
5
4
3
2
1
0
Field
S15
S14
S13
S12
S11
S10
S9
S8
Shutter_Lower
Access: Read
Address: 0x07
Reset Value: Undefined
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.
Maximum_Pixel
Access: Read
Address: 0x08
Reset Value: Any
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
Access: Read
Address: 0x09
Reset Value: Any
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 17-bit integer.
USAGE: This register is used to find the average pixel value. It reports the seven bits of a 16-bit counter, which sums all
pixels in the current frame. It may be described as the full sum divided by 512. To find the average pixel value,
use the following formula:
Average Pixel = Register Value * 128/121 = Register Value * 1.06
The maximum register value is 240. The minimum is 0. The pixel sum value can change every frame.
33
Minimum_Pixel
Access: Read
Address: 0x0a
Reset Value: Any
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.
Pixel_Grab
Access: Read/Write
Address: 0x0b
Reset Value: Any
Bit
7
6
5
4
3
2
1
0
Field
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
Data Type: Eight-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. The pixel map address and corresponding
sensor orientation is shown below.
34
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
Figure 28. Top view of pixel map address without lens
360
359
358
357
356
355
354
353
352
351
350
349
348
347
346
345
344
343
342
341
340
339
338
337
336
335
334
333
332
331
330
329
328
327
326
325
324
323
322
321
320
319
318
317
316
315
314
313
312
311
310
309
308
307
306
305
304
303
302
301
300
299
298
297
296
295
294
293
292
291
290
289
288
287
286
285
284
283
282
281
280
279
278
277
276
275
274
273
272
271
270
269
268
267
266
265
264
263
262
261
260
259
258
257
256
255
254
253
252
251
250
249
248
247
246
245
244
243
242
241
240
239
238
237
236
235
234
233
232
231
230
229
228
227
226
225
224
223
222
221
220
219
218
217
216
215
214
213
212
211
210
209
208
207
206
205
204
203
202
201
200
199
198
197
196
195
194
193
192
191
190
189
188
187
186
185
184
183
182
181
180
179
178
177
176
175
174
173
172
171
170
169
168
167
166
165
164
163
162
161
160
159
158
157
156
155
154
153
152
151
150
149
148
147
146
145
144
143
142
141
140
139
138
137
136
135
134
133
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Figure 29. Top view of pixel map address with lens
35
CRC0
Access: Read
Address: 0x0c
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. See Self Test register 0x10.
CRC1
Access: Read
Address: 0x0d
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. See Self Test register 0x10.
CRC2
Access: Read
Address: 0x0e
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. See Self Test register 0x10.
CRC3
Access: Read
Address: 0x0f
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. See Self Test register 0x10.
36
Self_Test
Access: Write
Address: 0x10
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
TESTEN
Data Type: Bit field
USAGE: 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 and I2C ports. Results are available in the CRC0-3 registers.
Field Name
Description
TESTEN
Enable System Self Test
0 = Disable
1 = Enable
The procedure to start self test is as follows:1. Perform power up sequence (refer to page 11 of datasheet)
2. Write data 0x5A to register 0x3A to initiate soft reset.
3. Write data 0xC1 to register 0x29.
4. Write data 0x59 to register 0x11
5. Write data 0xFF to register 0x60.
6. Write data 0x88 to register 0x61.
7. Write data 0xAA to register 0x72.
8. Write data 0xC4 to register 0x63
9. Write data 0x20 to register 0x75
10. Write data 0x05 to register 0x76
11. Write data 0x04 to register 0x7C
12. Write data 0xFF to register 0x7E
13. Write data 0x01 to register 0x10 to initiate self test.
14. Wait 250ms.
15. Read CRC0 from address 0x0c, CRC1 from address 0x0d, CRC2 from address 0x0e, CRC3 from address 0x0f.
16. After self test, execute power up sequence again.
The results are as follows.
CRC#
37
CRC0
0x3E
CRC1
0x5C
CRC2
0xA4
CRC3
0x24
BUTTON_STATUS
Access: Read/Write
Address: 0x12
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Assert
count
Assert
count
Deassert
count
Deassert
count
Reserved
Reserved
Reserved
But_Status
Data Type: Bit field
USAGE: Register 0x12 allows the user to read button status. Writing any value to this register will restart the counter.
Field Name
Description
Assert count 7:6
Counts for number of times the button state change from 0 to 1
Deassert count 5:4
Counts for number of times the button state change from 1 to 0
But_Status
Button current status
Run_Downshift
Access: Read/Write
Address: 0x13
Reset Value: 0x04
Bit
7
6
5
4
3
2
1
0
Field
RD7
RD6
RD5
RD4
RD3
RD2
RD1
RD0
This register set the Run to Rest 1 downshift time.
Run Downshift time = RD[7:0] x 8 x Run_rate.
Default value: 4 x 8 x 8 ms = 256 ms
Min:
2 x 8 x 8 ms = 128 ms
Max:
242 x 8 x 8 ms = 15,488 ms = 15.49 s
All the above values are calculated base on 25 MHz System clock.
Rest1_Period
Access: Read/Write
Address: 0x14
Reset Value: 0x01
Bit
7
6
5
4
3
2
1
0
Field
R1R7
R1R6
R1R5
R1R4
R1R3
R1R2
R1R1
R1R0
This register set the Rest 1 frame rate.
Rest1 frame rate = (R1R[7:0] + 1) x 10 ms.
Default value: 2 x 10 ms = 20 ms
Min:
2 x 10 ms = 20 ms
Max:
241 x 10 ms = 2,410 ms = 2.41 s
All the above values are calculated base on 100 Hz Hibernate clock.
38
Rest1_Downshift
Access: Read/Write
Address: 0x15
Reset Value: 0x1f
Bit
7
6
5
4
3
2
1
0
Field
R1D7
R1D6
R1D5
R1D4
R1D3
R1D2
R1D1
R1D0
This register set the Rest 1 to Rest 2 downshift time.
Rest1 Downshift time = R1D[7:0] x 16 x Rest1_Rate.
Default value: 31 x 16 x 20 ms (Rest1_Rate default) = 9,920 ms = 9.92 s
Min:
1 x 16 x 20 ms (Rest1_Rate min) = 320 ms
Max:
242 x 16 x 2.56 s (Rest1_Rate max) = 9,912 s = 165 min = 2.75 hr
All the above values are calculated base on 100 Hz Hibernate clock.
Rest2_Period
Access: Read/Write
Address: 0x16
Reset Value: 0x09
Bit
7
6
5
4
3
2
1
0
Field
R2R7
R2R6
R2R5
R2R4
R2R3
R2R2
R2R1
R2R0
This register set the Rest 2 frame rate.
Rest2 frame rate = (R2R[7:0] + 1) x 10 ms.
Default value: 10 x 10 ms = 100 ms
Min:
2 x 10 ms = 20 ms
Max:
241 x 10 ms = 2,410 ms = 2.41 s
All the above values are calculated base on 100 Hz Hibernate clock.
Rest2_Downshift
Access: Read/Write
Address: 0x17
Reset Value: 0x2f
Bit
7
6
5
4
3
2
1
0
Field
R2D7
R2D6
R2D5
R2D4
R2D3
R2D2
R2D1
R2D0
This register set the Rest 2 to Rest 3 downshift time.
Rest2 Downshift time = R2D[7:0] x 128 x Rest2_Rate.
Default value: 47 x 128 x 100 ms (Rest2_Rate default) = 601.6 s = 10 min
Min:
1 x 128 x 20 ms (Rest2_Rate min) = 2560 ms = 2.56 s
Max:
242 x 128 x 2.56 s (Resr2_Rate max) = 79,298 s = 1,321 min = 22 hrs
All the above values are calculated base on 100 Hz Hibernate clock.
39
Rest3_Period
Access: Read/Write
Address: 0x18
Reset Value: 0x31
Bit
7
6
5
4
3
2
1
0
Field
R3R7
R3R6
R3R5
R3R4
R3R3
R3R2
R3R1
R3R0
This register set the Rest 3 frame rate.
Rest3 frame rate = (R3R[7:0] + 1) x 10 ms.
Default value: 50 x 10 ms = 500 ms
Min:
2 x 10 ms = 20 ms
Max:
241 x 10 ms = 2,410 ms = 2.41 s
All the above values are calculated base on 100 Hz Hibernate clock.
Reserved
Address: 0x19
LED_Control
Access: Read/Write
Address: 0x1a
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
LED_On
LED2
LED1
LED0
Data Type: Bit field
USAGE: Register 0x1a allows the user to change the LED drive current of the sensor.
Field Name
Description
LED_On
0 = LED normal operation
1 = LED always On
LED2:0
0x00 = 13 mA
0x02 = 9.6 mA
0x07 = 27 mA
Reserved
40
Address: 0x1b
IO_Mode
Access: Read/Write
Address: 0x1c
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Burst
Reserved
SPI
Reserved
TWI
Data Type: Bit field
USAGE: Register 0x1c allows the user to read the Input or Output mode of the sensor.
Field Name
Burst
Description
Burst mode
0 = not in burst mode
1 = In Burst mode
SPI
SPI mode
0 = not in SPI mode
1 = In SPI mode
TWI
TWI mode
0 = not in TWI mode
1 = In TWI mode
EVENT_CTRL
Access: Read/Write
Address: 0x1d
Reset Value: 0x04
Bit
7
6
5
4
3
2
1
0
Field
Event_
Active_Set
Reserved
Reserved
Reserved
SFCL
FPD
BCL
MOT
Data Type: Bit field
USAGE: Register 0x1d allows the user to configure and control the Event_Int output pin. By default, FPD interrupt is
disabled while all other interrupts enabled.
Field Name
Description
Event_Active_Set
Event_Int pin setting
0 = Active-low Output
1 = Active-high Output
SFCL
1 = Disable Soft click interrupt
0 = Enable Soft Click interrupt
FPD
1 = Disable Finger Presence Detection (FPD) interrupt
0 = Enable finger presence detection interrupt
BCL
1 = Disable Button click interrupt
0 = Enable Button Click interrupt
MOT
1 = Disable Motion interrupt
0 = Enable Motion interrupt
41
Fast_Video_Dump
Access: Read/Write
Address: 0x28
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
FVD
Data Type: Bit field
USAGE: This register is used to enable and initiating Fast Video Dump. See note on Fast Video Dump for more information.
Field Name
Description
FVD
0: Disable FVD
1: Enable FVD
Observation
Access: Read/Write
Address: 0x2e
Reset Value: Any
Bit
7
6
5
4
3
2
1
0
Field
MODE1
MODE0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Data Type: Bit field
USAGE: Register 0x2e provides bits that are set every frame. It can be used during ESD testing to check that the chip is
running correctly. Writing anything to this register will clear the bits.
42
Field Name
Description
MODE1-0
Mode Status: Reports which mode the sensor is in.
00 = Run
01 = Rest1
10 = Rest2
11 = Rest3
PAD_STATUS
Access: Read
Address: 0x31
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
NRST_ST1
NRST_ST0
SHTDWN_
ST1
SHTDWN_
ST0
GPIO_ST1
GPIO_ST0
IOSEL_ST1
IOSEL_ST0
Data Type: Bit field
USAGE: This register is used to read or check on pin status.
Reserved
43
Field Name
Description
NRST_ST1-0
NRST Pin State
0x0 = Unknown
0x1= Low (Invalid as the chip will be in reset state)
0x2 = High (Indicate a floating high)
0x3 = Hi-Z
SHTDWN_ST1-0
SHTDWN Pin State
0x0 = Unknown
0x1= Low
0x2 = High (Invalid as chip will be in shutdown state)
0x3 = Hi-Z
GPIO_ST1-0
GPIO Pin State
0x0 = Unknown
0x1= Low
0x2 = High
0x3 = Hi-Z
IOSEL_ST1-o
IO_SELECT Pin State
0x0 = Unknown
0x1= Low
0x2 = High
0x3 = Hi-Z
Address: 0x32
PAD_TEST_OUT
Access: Read/Write
Address: 0x33
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
EVENT_O
GPIO_O
MOSI_O
MISO_O
Data Type: Bit field
USAGE: This register is used to set the state of the output pin.
Field Name
Description
EVENT_O
Set state for EVENT_INT output pin
0x0: Low
0x1: High
GPIO_O
Set state for GPIO_O output pin
0x0: Low
0x1: High
MOSI_O
Set state for MOSI_O output pin
0x0: Low
0x1: High
MISO_O
Set state for MISO_O output pin
0x0: Low
0x1: High
PAD_FUNCTION
Access: Write
Address: 0x34
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
OUT_
TEST_EN
Reserved
Reserved
Reserved
Reserved
Data Type: Bit field
USAGE: This register is used to enable output pin testing.
Field Name
Description
OUT_TEST_EN
Enable Output Pin Test
SOFT_RESET
Access: Write
Address: 0x3a
Reset Value: 0x00
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.
44
Shutter_Max_Hi
Access: Read/Write
Address: 0x3b
Reset Value: 0x0b
Bit
7
6
5
4
3
2
1
0
Field
SMH7
SMH6
SMH5
SMH4
SMH3
SMH2
SMH1
SMH0
Data Type: 8-Bit integer
USAGE: This value is the upper 8-bit of shutter maximum open time. Shutter value represents pixel array exposure time
in multiples of internal clock cycles with maximum value at 2929 decimal.
Shutter_Max_Lo
Access: Read/Write
Address: 0x3c
Reset Value: 0x71
Bit
7
6
5
4
3
2
1
0
Field
SML7
SML6
SML5
SML4
SML3
SML2
SML1
SML0
Data Type: 8-Bit integer
USAGE: This value is the lower 8-bit of shutter maximum open time. Shutter value represents pixel array exposure time
in multiples of internal clock cycles.
Reserved
Address: 0x3d
Inverse_Revision_ID
Access: Read
Address: 0x3e
Reset Value: 0xFF
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
Access: Read
Address: 0x3f
Reset Value: 0x77
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.
45
Reserved
Address: 0x40-0x5f
OFN_Engine1
Access: Read/Write
Address: 0x60
Reset Value: 0x84
Bit
7
6
5
4
3
2
1
0
Field
Engine
Speed
Assert/
Deassert
XYQ
Soft_Click
FPD_En
XY_Scale
PWM
Data Type: Bit field
USAGE: This register is used to set several properties of the sensor.
Field Name
Description
Engine
Master control of OFN engine. Need to enable this bit to enable the rest of OFN
features and properties
0 = Disable OFN properties
1 = Enable OFN properties
Speed_En
Speed switching enable/disable bit
0 = Disable speed switching
1 = Enable speed switching
Assert/ Deassert
Assert/ Deassert mode enable/disable bit
0 = Disable Assert/Deassert
1 = Enable Assert/Deassert
XY Q
XY quantization enable/disable bit
0 = Disable quantization
1 = Enable quantization
Soft_Click
Soft click enable/disable bit
0 = Disable soft click
1 = Enable soft click
FPD_En
Finger presence detection enable/disable bit
0 = Disable finger presence detection
XY_Scale
XY scaling factor enable/disable bit
1 = Enable finger presence detection
0 = Disable scaling
1 = Enable scaling
PWM
Pulse Width Modulation function enable/disable bit
0 = Disable PWM
1 = Enable PWM
46
OFN_Engine2
Access: Read/Write
Address: 0x61
Reset Value: 0x89
Bit
7
6
5
4
3
2
1
Field
Reserved
Reserved
FPD_Rest_
Wake1
FPD_Rest_
Wake0
FPD_Mot_
Cut
Reserved
PAD_Chk On FPD_SQ_EN
Data Type: Bit field
USAGE: This register is used to set several properties of the sensor related to FPD function.
Field Name
Description
FPD_Rest_Wake1:0
Wakes up from rest with FPD
0 = FPD rest wake up disabled
1 = Wake up when finger is present OR motion is detected
2 = Wake up when finger is present AND motion is detected
FPD_Mot_Cut
In FPD enabled mode, cut off motion when finger is not detected and shutter is
below preset value.
Shutter preset value can configured by SHUT_CUTOFF_THRES in FPD_CTRL
(register 0x75).
0 = Disable FPD_Mot_Cut
1 = Enable FPD_Mot_Cut
47
PAD_Chk_On
Enable this bit for PAD_STATUS check
FPD_SQ_EN
To improve FPD on low reflectance surface by comparing the instantaneous
Squal value with a threshold set in FPD_SQUAL_THRESH (register 0x78).
0 = Disable FPD_SQ_EN
1 = Enable FPD_SQ_EN
0
Resolution
Access: Read/Write
Address: 0x62
Reset Value: 0x32
Bit
7
6
5
4
3
2
1
0
Field
WakeRES3
WakeRES2
WakeRES1
WakeRES0
RES3
RES2
RES1
RES0
Data Type: Bit field
USAGE: This register is used to set several properties of the sensor.
Field Name
Description
WakeRES3:0
Sets resolution when sensor wakes up from rest modes. Effective only when
speed switching is enabled.
0x00 : 125 cpi 0x05 : 1250 cpi
0x01 : 250 cpi
0x02 : 500 cpi
0x03 : 750 cpi
0x04 : 1000 cpi
RES3:0
Sets resolution of sensor.
0x00 : 125 cpi 0x05 : 1250 cpi
0x01 : 250 cpi
0x02 : 500 cpi
0x03 : 750 cpi
0x04 : 1000 cpi
If speed switching is enabled and both LOW_DPI_ON and HIGH_DPI_ON bits in
register 0x63 are enabled or set to '1', resolution is automatically switched from
250-500-750-1000-1250.
Note: Reading this RES3:0 bit during speed switching mode provides readback
of the instantaneous resolution that corresponds to speed detected based on
the thresholds set in Speed_STXX. To test the presence of 5 levels switching
by reading RES3:0 of this register, first try reducing the Speed_STXX threshold
before setting it back to the desired speed threshold. If speed switching is disabled, this register can be set to any of the available settings from 0x0 to 0x5.
48
Speed_Ctrl
Access: Read/Write
Address: 0x63
Reset Value: 0x0E
Bit
7
6
5
4
3
2
1
0
Field
SEL_XY
XY_scale2
XY_scale1
XY_scale0
SP_IntVal1
SP_IntVal0
LOW_DPI_ON
HIGH_DPI_ON
Data Type: Bit field
USAGE: This register is used to set several properties of the sensor.
Field Name
Description
Sel_XY
Select X or Y scale
0 = Enable X scale
1 = Enable Y scale
XY_scale 2:0
Set scaling factor
0 = 0%
4 = 50%
1 = 12.5% 5 = 62.5%
2 = 25% 6 = 75%
3 = 37.5% 7 = 87.5%
SPIntVal 1:0
Speed switching checking interval
0x00: 4 ms
0x01: 8 ms
0x02: 12 ms
LOW_DPI_ON
0=Disable extra low DPI.
1= Enable extra low DPI on top of 3-steps switching.
Default 3-step speed switching (low, mid, high).
HIGH_DPI_ON
0=Disable extra high DPI.
1= Enable extra high DPI on top of 3-steps switching.
Default 3-step speed switching (low, mid, high).
0x03: 16 ms
Speed_ST12
Access: Read/Write
Address: 0x64
Reset Value: 0x08
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
49
Field Name
Description
ST 7:0
Sets resolution switching from step 1 to 2. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
Speed_ST21
Access: Read/Write
Address: 0x65
Reset Value: 0x06
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
Field Name
Description
ST 7:0
Sets resolution switching from step 2 to 1. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
Speed_ST23
Access: Read/Write
Address: 0x66
Reset Value: 0x40
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
Field Name
Description
ST 7:0
Sets resolution switching from step 2 to 3. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
OFN_Speed_ST32
Access: Read/Write
Address: 0x67
Reset Value: 0x08
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
Field Name
Description
ST 7:0
Sets resolution switching from step 3 to 2. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
OFN_Speed_ST34
Access: Read/Write
Address: 0x68
Reset Value: 0x48
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
50
Field Name
Description
ST 7:0
Sets resolution switching from step 3 to 4. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
Speed_ST43
Access: Read/Write
Address: 0x69
Reset Value: 0x0a
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
Field Name
Description
ST 7:0
Sets resolution switching from step 4 to 3. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
Speed_ST45
Access: Read/Write
Address: 0x6a
Reset Value: 0x50
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
Field Name
Description
ST 7:0
Sets resolution switching from step 4 to 5. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
Speed_ST54
Access: Read/Write
Address: 0x6b
Reset Value: 0x48
Bit
7
6
5
4
3
2
1
0
Field
ST
ST
ST
ST
ST
ST
ST
ST
Data Type: Bit field
USAGE: This register is used to set several speed switching properties of the sensor.
51
Field Name
Description
ST 7:0
Sets resolution switching from step 5 to 4. Write in hexadecimal value.
Formula (in decimal) = Velocity (inch per second) * 8
GPIO_CTRL
Access: Read/Write
Address: 0x6c
Reset Value: 0x80
Bit
7
6
5
4
3
2
1
0
Field
GPIO_
Active_Set
Reserved
GPIO_
Mode5
GPIO_
Mode4
PWM_
Thres3
PWM_
Thres2
PWM_Sel1
PWM_Sel0
Data Type: Bit field
USAGE: This register is used to set GPIO and PWM control.
Field Name
GPIO_Active_Set
Description
0 = GPIO is active LOW output
1 = GPIO is active HIGH output
GPIO_Mode5:4
0 = Output FPD
1 = Output PWM
2 = Mechanical button input
PWM_Thres3:2
Start PWM only when Delta_X + Delta_Y is greater than threshold in Speed
mode (Speed bit below).
0 = delta > 0
1 = delta > 8
2 = delta > 16
3 = delta >24
PWM_Sel1:0
0 = Finger On/Off, light up in 1 sec
1 = Finger On/Off, light up in 2 sec
2 = Finger On/Off, light up in 3 sec
3 = Speed
AD_CTRL
Access: Read/Write
Address: 0x6d
Reset Value: 0xc4
Bit
7
6
5
4
3
2
1
0
Field
1
1
Reserved
Reserved
ST_HIGH3
ST_HIGH2
ST_HIGH1
ST_HIGH0
Data Type: Bit field
USAGE: This register is used to control Assert De-assert. Must write 1to bit 7 and 6.
52
Field Name
Description
ST_HIGH3:0
High speed definition.
Any steps equal to or above this setting will use high speed A/D threshold.
AD_ATH_HIGH
Access: Read/Write
Address: 0x6e
Reset Value: 0x3a
Bit
7
6
5
4
3
2
1
0
Field
ATH_H
ATH_H
ATH_H
ATH_H
ATH_H
ATH_H
ATH_H
ATH_H
Data Type: Bit field
USAGE: This register is used to set HIGH speed Assert shutter threshold.
Field Name
Description
ATH_H 7:0
Sets HIGH speed assert threshold. Write in hexadecimal value.
Formula (in decimal) = Shutter value / 8.
It is recommended to have hysteresis of 60 to 100 between assert and
de-assert threshold.
AD_DTH_HIGH
Access: Read/Write
Address: 0x6f
Reset Value: 0x40
Bit
7
6
5
4
3
2
1
0
Field
DTH_H
DTH_H
DTH_H
DTH_H
DTH_H
DTH_H
DTH_H
DTH_H
Data Type: Bit field
USAGE: This register is used to set HIGH speed De-assert shutter threshold.
Field Name
Description
DTH_H 7:0
Sets HIGH speed de-assert threshold. Write in hexadecimal value.
Formula (in decimal) = Shutter value / 8.
It is recommended to have hysteresis of 60 to 100 between assert and
de-assert threshold.
AD_ATH_LOW
Access: Read/Write
Address: 0x70
Reset Value: 0x35
Bit
7
6
5
4
3
2
1
0
Field
ATH_L
ATH_L
ATH_L
ATH_L
ATH_L
ATH_L
ATH_L
ATH_L
Data Type: Bit field
USAGE: This register is used to set LOW speed Assert shutter threshold.
53
Field Name
Description
ATH_L 7:0
Sets LOW speed assert threshold. Write in hexadecimal value.
Formula (in decimal) = Shutter value / 8.
It is recommended to have hysteresis of 60 to 100 between assert and
de-assert threshold.
AD_DTH_LOW
Access: Read/Write
Address: 0x71
Reset Value: 0x3b
Bit
7
6
5
4
3
2
1
0
Field
DTH_L
DTH_L
DTH_L
DTH_L
DTH_L
DTH_L
DTH_L
DTH_L
Data Type: Bit field
USAGE: This register is used to set LOW speed De-assert shutter threshold.
Field Name
Description
DTH_L 7:0
Sets LOW speed de-assert threshold. Write in hexadecimal value.
Formula (in decimal) = Shutter value / 8.
It is recommended to have hysteresis of 60 to 100 between assert and
de-assert threshold.
QUANTIZE_CTRL
Access: Read/Write
Address: 0x72
Reset Value: 0x99
Bit
7
6
5
4
3
2
1
0
Field
YQ_ON
YQ_DIV6
YQ_DIV5
YQ_DIV4
XQ_ON
XQ_DIV2
XQ_DIV1
XQ_DIV0
Data Type: Bit field
USAGE: This register is used to set quatization for Delta_X and Delta_Y. If both X and Y quantization modes are on, then
only largest quantized X or Y will be reported.
Field Name
Description
YQ_ON
0 = Y quantization off
1 = Y quantization On
YQ_DIV6:4
Quantization factor 2YQ_DIV . Reported YQ = DY / 2YQ_DIV .
XQ_ON
0 = X quantization off
1 = X quantization On
XQ_DIV2:0
Quantization factor 2XQ_DIV . Reported XQ = DX / 2XQ_DIV .
XYQ_THRESH
Access: Read/Write
Address: 0x73
Reset Value: 0x02
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
Reserved
XYQ_M
XYQ_C1
XYQ_C0
Data Type: Bit field
USAGE: This register is used to set quatization gradient for DeltaX and DeltaY.
54
Field Name
Description
XYQ_M
Gradient of linear region
0 = Gradient 1
1 = Gradient 2
XYQ_C1:0
Indicates the offset of linear region (max of C = 3 or 0x03)
MOTION_CTRL
Access: Read/Write
Address: 0x74
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
Reserved
Motion_
Int_Thres2
Motion_
Int_Thres1
Motion_
Int_Thres0
Data Type: Bit field
USAGE: This register is used to control Motion interrupt.
Field Name
Description
Motion_Int_
Thres2:0
Motion interrupt threshold
Only trigger Motion Interrupt if Delta_X + Delta_Y > Threshold
FPD_CTRL
Access: Read/Write
Address: 0x75
Reset Value: 0xfa
Bit
7
6
5
4
3
2
1
0
Field
Shut_Cut
_Thres7
Shut_Cut
_Thres6
Shut_Cut
_Thres5
Shut_Cut
_Thres4
FPD_On_
Hyst3
FPD_On_
Hyst2
FPD_Off_
Hyst1
FPD_Off_
Hyst0
Data Type: Bit field
USAGE: This register is used to set sensor FPD control.
Field Name
Description
Shut_Cut_Thres7:4
Motion is cut off when shutter value is less than threshold. Valid only when
FPD_Mot_Cutoff is enabled.
Units are multiple of 256.
FPD_On_Hyst3:2
Hysteresis counter for finger on
FPD_Off_Hyst1:0
Hysteresis counter for finger off
FPD_THRESH
Access: Read/Write
Address: 0x76
Reset Value: 0x1c
Bit
7
6
5
4
3
2
1
0
Field
FPD_T
FPD_T
FPD_T
FPD_T
FPD_T
FPD_T
FPD_T
FPD_T
Data Type: Bit field
USAGE: This register is used to set the sensitivity of FPD. See OFN A350 Firmware Guide for more information on FPD
operation and thresholds setting.
55
Field Name
Description
FPD_T 7:0
Threshold to compare with FPD Value
ORIENT_CTRL
Access: Read/Write
Address: 0x77
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
XY_SWAP
Y_INV
X_INV
Reserved
Reserved
Reserved
Reserved
Reserved
Data Type: Bit field
USAGE: This register is used to configure Delta_X and Delta_Y reporting direction with respect to sensor orientation
Field Name
Description
XY_SWAP
0 = Normal sensor reporting of Delta_X, Delta_Y. (default)
1 = Swap data of Delta_X to Delta_Y and Delta_Y to Delta_X.
Y_INV
0 = Normal sensor reporting of Delta_Y. (default)
1 = Invert data of Delta_Y only.
X_INV
0 = Normal sensor reporting of Delta_X. (default)
1 = Invert data of Delta_X only.
FPD_SQUAL_THRESH
Access: Read/Write
Address: 0x78
Reset Value: 0x40
Bit
7
6
5
4
3
2
1
0
Field
FPD_S_T
FPD_S_T
FPD_S_T
FPD_S_T
FPD_S_T
FPD_S_T
FPD_S_T
FPD_S_T
Data Type: Bit field
USAGE: This register is to set the FPD Squal Threshold. It is used when bit 0 (FPD_SQ_EN bit) of OFN_Engine2 (0x61) is
enabled for low reflectance surface navigation.
Field Name
Description
FPD_S_T
Squal FPD Threshold to compare with Squal values
FPD_VALUE
Access: Read/Write
Address: 0x79
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
Data Type: Bit field
USAGE: This register stores the FPD value that indicates surface reflectivity. Higher FPD value means higher finger or
surface reflectivity.
56
Field Name
Description
FPD_VALUE 7:0
FPD Value
FPD_STATUS
Access: Read
Address: 0x7a
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
FPD_Hyst7
FPD_Hyst6
FPD_Hyst5
FPD_Hyst4
FPD_SQ_
Hyst3
FPD_SQ_
Hyst2
FPD_SQ_
Hyst1
FPD_On
Data Type: Bit field
USAGE: This register is used to confirm FPD flag and to set FPD hysteresis threshold.
Field Name
Description
FPD_Hyst7:4
FPD hysteresis threshold boundary.
Actual FPD Hysteresis Threshold = 8 x [FPD_Hyst7:4]
FPD_SQ_Hyst3:1
FPD Squal hysteresis threshold boundary.
Actual FPD SQ Hysteresis Threshold = 4 x [FPD_SQ_Hyst3:1]
FPD_On
0 = finger is not present
1 = finger is present
SC_CTRL
Access: Read/Write
Address: 0x7b
Reset Value: 0x25
Bit
7
6
5
4
3
2
1
0
Field
Reserved
TIM_Res_
Th6
TIM_Res_
Th5
TIM_Res_
Th4
Reserved
Tap+N_
Hold_En
Double_
Click_En
Single_
Click_En
Data Type: Bit field
USAGE: This register is used to set sensor soft click.
Field Name
Description
TIM_Res_Th6:4
Tap and Hold timer reset threshold
Tap_N_Hold_En
0 = Disable Tap and Hold
1 = Enable Tap and Hold
Double_Click_En
0 = Disable Double Click
1 = Enable Double Click
Single_Click_En
0 = Disable Single Click
1 = Enable Single Click
SC_T_TAPNHOLD
Access: Read/Write
Address: 0x7c
Reset Value: 0x45
Bit
7
6
5
4
3
2
1
0
Field
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
Data Type: Bit field
USAGE: This register is used to set the minimum time before Tap N Hold is triggered.
57
Field Name
Description
SC_Dou 7:0
Sets waiting time to activate Tap and Hold
SC_T_DOUBLE
Access: Read/Write
Address: 0x7d
Reset Value: 0x1e
Bit
7
6
5
4
3
2
1
0
Field
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
SC_Dou
Data Type: Bit field
USAGE: This register is used to set time between first click and second click to trigger double click. Any second successive click within this time will be considered a double click.
Field Name
Description
SC_Dou 7:0
Sets waiting time after single click for double click to happen
SC_DELTA_THRESH
Access: Read/Write
Address: 0x7e
Reset Value: 0x19
Bit
7
6
5
4
3
2
1
0
Field
SC_Delta
SC_Delta
SC_Delta
SC_Delta
SC_Delta
SC_Delta
SC_Delta
SC_Delta
Data Type: Bit field
USAGE: This register is used to set sensor single click threshold.
Field Name
Description
SC_Delta 7:0
Threshold to validate single click. Single click is only valid if motion delta sum
(Delta_X + Delta_Y) is less than threshold. Units are in 500 cpi.
SC_STATUS
Access: Read/Write
Address: 0x7f
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
Reserved
Reserved
Reserved
Reserved
Reserved
Tap+N_
Hold
Double_
Click
Single_
Click
Data Type: Bit field
USAGE: This register is used to confirm which soft click has been triggered when there is a soft click interrupt being
triggered.
58
Field Name
Description
Tap_N_Hold
0 = Tap and Hold not detected
1 = Tap and Hold detected
Double_Click
0 = Double click not detected
1 = Double click detected
Single_Click
0 = Single click not detected
1 = Single click detected
Packing information
Packaging tape, reel and packing information.
11
12 1
2
3
4
0 2
10
9
8
7
6
EMBOSSED LETTERING
16.0mm HEIGHT x MIN. 0.4mm THICK.
Ø329.0±1.0
5
HUB
Ø100.0±0.5
16MM
DATE CODE
6
PS
COLOUR
SURFACE RESISTIVITY
1.
PANTONE 285U
DARK BLUE
ANTISTATIC COATED
106 – 1011 PER OHMS SQUARE
2.
BLACK
CONDUCTIVE
工商网监
湘ICP备2023018690号
