PixArt Imaging Inc.
ADNS-7530 Integrated Molded Lead-Frame DIP Sensor
LASER Drive Mode
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.
The laser is driven in pulsed mode during normal
operation. A calibration mode is provided which drives
the laser in continuous (CW) operation.
Eye Safety
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.
The ADNS-7530 integrated molded lead-frame DIP
sensor and the associated components in the schematic
of Figure 6 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.
9. Set the Range and Range_C bits in registers 0x1a
and 0x1f, respectively, to choose to the higher laser
current range.
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.
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-7530 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 implement-
ed as shown in the recommended application circuit of
Figure 6. For more information, please refer to Eye Safety
Application Note 5361.
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-7530 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, reli-
ability and safety for the product design.
LASER Power Adjustment Procedure
LASER Output Power
1. The ambient temperature should be 25C +/- 5C.
The laser beam output power as measured at the naviga-
tion surface plane is specified below. The following con-
ditions apply:
2. Set V
to its permanent value.
DD3
3. Set the Range bits (bit 7 and 6 of register 0x1a) to b’01.
1. The system is adjusted according to the above
procedure.
4. Set the Range_C complement bits (bit 7 and 6 of
register 0x1f) to b’10.
2. The system is operated within the recommended
operating temperature range.
5. Enable the Calibration mode by writing to bits [3,2,1]
of register 0x1A so the laser will be driven with 100%
duty cycle.
3. The V
value is no greater than 300mV above its
DD3
value at the time of adjustment.
6. Set the laser current to the minimum value by writing
0x00 to register 0x1c, and the complementary value
0xFF to register 0x1d.
4. No allowance for optical power meter accuracy is
assumed.
LASER Output Power
Parameter
Symbol
Minimum Maximum Units
Notes
Laser output power LOP
716
uW
Class 1 limit with recommended VCSEL and lens.
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
8
PIXART [ PIXART IMAGING INC. ]
