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
procedure.
2. The system is operated within the recommended
operating 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
assumed.
Single Fault Detection
ADNS-6010 is able to detect a short circuit, or fault, con-
dition 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 de-
tection 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 ex-
cess 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 when-
ever 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 detec-
tion 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 ]
