Notes (for Figure 5)
•
Caps for pins 11, 12, 16 and 18 MUST have trace lengths LESS than
5 mm on each side.
•
Pins 16 and 18 caps MUST use pin 17 GND.
•
Pin 9, if used, should not be connected to PCB GND to reduce po-
tential RF emissions.
•
The 0.1 uF caps must be ceramic.
•
Caps should have less than 5 nH of self inductance.
•
Caps should have less than 0.2 W ESR.
•
NC pins should not be connected to any traces.
•
Surface mount parts are recommended.
•
Care must be taken when interfacing a 5V microcontroller to the
ADNS-6010. Serial port inputs on the sensor should be connected
to open-drain outputs from the microcontroller or use an active
drive level shifter. NPD and RESET should be connected to 5V
microcontroller outputs through a resistor divider or other level
shifting technique.
•
VDD3 and GND should have low impedance connections to the
power supply.
•
Because the RBIN pin sets the XY_LASER current, the following PC
board layout practices should be followed to reduce the chance
of uncontrolled laser drive current caused from a leakage path
between RBIN and ground. One hypothetical source of such a
leakage path is PC board contamination due to a liquid, such as a
soft drink, being deposited on the printed circuit board.
o The RBIN resistor should be located close to the sensor pin
13. The traces between the resistor and the sensor should be
short.
o The pin 13 solder pad and all exposed conductors connected
to pin 13 should be surrounded by a guard trace connected to
VDD3 and devoid of a solder mask.
o The pin 13 solder pad, the traces connected to pin 13, and the
RBIN resistor should be covered with a conformal coating.
o The RBIN resistor should be a thru-hole style to increase the
distance between its terminals. This does not apply if a confor-
mal coating is used.
Eye Safety
The ADNS-6010 and the associated components in the
schematic of Figure 5 are intended to comply with Class
1 Eye Safety Requirements of IEC 60825-1. Avago Tech-
nologies 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 ADNS-6010 generates the
drive current for the laser diode (ADNV-6330). In order to
stay below the Class 1 power requirements, resistor Rbin
must be set at least as high as the value in the bin table
of Figure 5, based on the bin number of the laser diode
and LP_CFG0 and LP_CFG1 must be programmed to ap-
propriate values. Avago Technologies recommends using
the exact Rbin value specified in the bin table to ensure
sufficient laser power for navigation. The system com-
prised of the ADNS-6010 and ADNV-6330 is designed to
maintain the output beam power within Class 1 require-
ments over component manufacturing tolerances and
the recommended temperature range when adjusted per
the procedure below and when implemented as shown
in the recommended application circuit of Figure 5. For
more information, please refer to Avago Technologies
Laser Mouse Eye Safety Calculation Application Note
5088.
LASER Power Adjustment Procedure
1. The ambient temperature should be 25C +/- 5C.
2. Set VDD3 to its permanent value.
3. Ensure that the laser drive is at 100% duty cycle.
4. Program the LP_CFG0 and LP_CFG1 registers to
achieve an output power as close to 506uW as
possible without exceeding it.
Good engineering practices should be used to guarantee
performance, reliability and safety for the product design.
Avago Technologies has additional information and de-
tail, such as firmware practices, PCB layout suggestions,
and manufacturing procedures and specifications that
could be provided.
LASER Drive Mode
The LASER has 2 modes of operation: DC and Shutter. In
DC mode, the LASER is on at all times the chip is powered
except when in the power down mode via the NPD pin.
In shutter mode the LASER is on only during the portion
of the frame that light is required. The LASER mode is set
by the LASER_MODE bit in the Configuration_bits regis-
ter. For optimum product lifetime, Avago Technologies
recommends the default Shutter mode setting (except
for calibration and test).
Laser Bin Table
Bin Number
2A
3A
Rbin Resistor
Value (kohm)
18.7
12.7
Match_Bit
(Reg 0x2C, Bit7)
0
0
6
AVAGO [ AVAGO TECHNOLOGIES LIMITED ]
