8
LASER Drive
Oscalator
ADNS-9800
Image
VCSEL
NCS
SCLK
MOSI
MISO
MOTION
XYLASER
LASER_NEN
+VCSEL
-VCSEL
PWR_OPT
DGND
VDDIO
REFA
VDD 3/REFB
GND
VDD 5/VDD 3
Power and control
Serial Port and Register
Figure 7. Block diagram of ADNS-9800
Regulatory Requirements
• Passes FCC B and worldwide analogous emission limits
when assembled into a mouse with shielded cable and
following PixArt recommendations.
• Passes IEC-1000-4-3 radiated susceptibility level when
assembled into a mouse with shielded cable and
following PixArt recommendations.
• Passes EN61000-4-4/IEC801-4 EFT tests when
assembled into a mouse with shielded cable and
following PixArt recommendations.
• Provides sufficient ESD creepage/clearance distance to
withstand discharge up to 15 KV when assembled into
a mouse according to usage instructions above.
• Passes IEC/EN 60825-1 Eye Safety Class 1 when
operating with the laser output power pre-calibrated
by PixArt Imaging without external hardware and
software control of laser current.
Parameter Symbol Min. Max. Units Notes
Laser
output
power
LOP
716
mW
Class 1 limit with
ADNS-6190-002
lens.
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 3D model file when use with ADNS-6190-
002 lens. The lens flange can be sealed (i.e. glued) to the
base plate. Note that the lens material is polycarbonate
and therefore, cyanoacrylate based adhesives or other
adhesives that may damage the lens should NOT be used.
Eye Safety
The ADNS-9800 sensor and the associated components in
the schematics of Figure 6 are intended to comply with
Class 1 Eye Safety Requirements of IEC 60825-1. PixArt
Imaging calibrates the sensor’s laser output power
(LOP) to Class 1 eye safety level and store the registers
values that control the LOP prior shipping out, thus no
LOP calibration is required in complete mouse system at
manufacturer site.
ADNS-9800 sensor is designed to maintain the laser
output power using ADNS-6190-002 lens within Class 1
Eye Safety requirements over components manufactur-
ing tolerances under the recommended operating con-
ditions and application circuits of Figure 6 as specified in
this document. Under normal operating conditions, the
sensor generates the drive current for the VCSEL. Increas-
ing the LOP by other means on hardware and software
can result in a violation of the Class 1 eye safety limit of
716 mW. For more information, please refer to Eye Safety
Application Note.
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 for testing purpose.
The default setting of laser is in Forced_Disable mode,
which the laser is turned OFF. The laser have to be turned
ON during power up sequence by setting Forced_
Disabled bit (Bit-0) of LASER_CTRL0 register to 0.
Disabling the LASER
LASER_NEN is connected to the gate of an external
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, LASER_NEN goes high to
turn the transistor off and disconnect REFB from the laser.
ADNS-9800 Laser Gaming Sensor
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
Typical Distance (mm) ADNS-6190-002
Creepage 17.3
Clearance 1.8