Parameter
Laser output power
Symbol
LOP
Minimum
Maximum
716
Units
uW
Notes
Per conditions above
LASER Output Power
The laser beam output power as measured at the navi-
gation surface plane is specified below. The following
conditions apply:
1. The system is adjusted according to the above pro-
cedure.
2. The system is operated within the recommended op-
erating temperature range.
3. The VDD3 value is no greater than 50mV above its
value at the time of adjustment.
4. No allowance for optical power meter accuracy is as-
sumed.
Single Fault Detection
ADNS-6010 is able to detect a short circuit, or fault,
condition at the RBIN and XY_LASER pins, which could
lead to excessive laser power output. A low resistance
path to ground on either of these pins will trigger the
fault detection circuit, which will turn off the laser drive
current source and set the LASER_NEN output high.
When used in combination with external components
as shown in the block diagram below, the system will
prevent excess laser power for a single short to ground
at RBIN or XY_LASER by shutting off the laser. Refer to the
PC board layout notes for recommendations to reduce
the chance of high resistance paths to ground existing
due to PC board contamination.
In addition to the continuous fault detection described
above, an additional test is executed automatically
whenever the LP_CFG0 register is written to. This test
will check for a short to ground on the XY_LASER pin,
a short to VDD3 on the XY_LASER pin, and will test the
fault detection circuit on the XY_LASER pin.
Disabling the LASER
LASER_NEN is connected to the base of a PNP transistor
which when ON connects V
DD3
to the LASER. In normal
operation, LASER_NEN is low. In the case of a fault con-
dition (ground at XY_LASER or RBIN), LASER_NEN goes
high to turn the transistor off and disconnect V
DD3
from
the LASER.
VDD3
Microcontroller
ADNS-6010
LASER
DRIVER
fault control
block
LASER
voltage sense
XY_LASER
LASER_NEN
VDD3
RESET
NPD
current set
RBIN
GND
Figure 6. Single Fault Detection and Eye-safety Feature Block Diagram
7
AVAGO [ AVAGO TECHNOLOGIES LIMITED ]
