ADNB-6032 Ver la hoja de datos (PDF) - HP => Agilent Technologies
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ADNB-6032 Datasheet PDF : 45 Pages
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LASER Output Power
The laser beam output power
as measured at the navigation
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 VDD value is no greater
than 300mV above its value
at the time of adjustment.
4. No allowance for optical
power meter accuracy is
assumed.
Disabling the LASER
LASER_NEN is connected to
the gate of a P-channel
MOSFET transistor which when
ON connects VDD to the
LASER. In normal operation,
LASER_NEN is low. In the
case of a fault condition
(ground or VDD at XY_LASER),
LASER_NEN goes high to turn
the transistor off and
disconnect VDD from the
LASER.
Single Fault Detection
ADNS-6030 is able to detect a
short circuit or fault condition
at the XY_LASER pin, which
could lead to excessive laser
power output. A path to
ground on this pin 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
resistive path to ground at
XY_LASER by shutting off the
laser. In addition to the
ground path fault detection
described above, the fault
detection circuit is
continuously checked for
proper operation by internally
generating a path to ground
with the laser turned off via
LASER_NEN. If the XY_LASER
pin is shorted to VDD, this test
will fail and will be reported
as a fault.
VDD
Microcontroller
ADNS-6030
LASER
DRIVER
LASER_NEN
VDD
fault control
block
Serial port
voltage sense
XY_LASER
VCSEL
current set
GND
Figure 6. Single Fault Detection and Eye-safety Feature Block Diagram
8
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