ADNS-7700-HMMY Avago Technologies US Inc., ADNS-7700-HMMY Datasheet - Page 10

• Manufacturer Part Number: ADNS-7700-HMMY
• Description: USB SoC Lsr Snsr 5B+TW+OTF+KM
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-7700-HMMY

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

OSCILLATOR
Block Diagram
Figure 7. ADNS-7700 Block Diagram
Eye Safety
ADNS-7700 sensor and the associated components in
the schematic of Figure 6 are intended to comply with
Class 1 Eye Safety requirements of IEC/EN 60825-1. Avago
Technologies calibrate sensor laser output power (LOP)
to Class 1 eye safety level prior shipping out, thus no laser
output power calibration is required at mouse manufac-
turer site.
ADNS-7700 sensor is designed to maintain the laser
output power using ADNS-6180-002 lens within Class 1
requirements over components manufacturing toleranc-
es under the recommended operating conditions and ap-
plication circuit of Figure 6 as specified in this document.
Under normal operating conditions, the sensor gener-
ates the drive current for the VCSEL. Increasing the LOP
by other means on hardware and software can result in a
violation of the Class 1 eye safety limit of 716 PW. For more
information, please refer to Eye Safety Application Note.
Laser Output Power
The laser output power,LOP can be measured at the navi-
gation surface plane. The sensor can drive the laser in
continuous (CW) mode by writing to LSR_CTRL0 and LSR_
CTRL1 registers via USB Set Vendor test command.
The pre-calibrated LOP value at typical operating supply
voltage and temperature of 25 ± 5°C should not exceed-
10
Z-WHEEL
LASER
PORT
USB
OSC_OUT
LASER_GND
VCSEL  VE
OSC_IN
VCSEL +VE
REFC
D +
D
ZB
ZA
LASER
DRIVE
VCSEL
OSCILLATOR
I/O PROCESSOR
CONTROL AND
PROCESSOR
IMAGE
POWER
RESET
ON
V
O
A
G
L
T
E
R
G
U
O
R
E
A
T
L
ing 506PW, otherwise the LOP
Maximum Rating is applicable.
The following conditions apply:
1. The system is operated based on the recommended
2. Measurement is taken at the optical center and illumi-
3. No allowance for optical power meter accuracy is
Single Fault Detection
ADNS-7700 sensor is able to detect a short circuit or fault
condition at the -VCSEL pin, which could lead to exces-
sive 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. The system will prevent excess laser power for a re-
sistive path to ground at -VCSEL by shutting off the laser.
In addition to the ground path fault detection described
above, the fault detection circuit is continuously check-
ing for proper operation by internally generating a path
to ground with the laser turned off via LASER_NEN. If the
-VCSEL pin is shorted internally to VDD3 or externally to
REFB, this test will fail and will be reported as a fault.
application circuit in Figure 6 and within the recom-
mended operating conditions.
nation angle on navigation surface plane, Z.
assumed.
B1
B 2
B3
B4
B5
TW1
TW2
REFA
REFB
VDD5
DGND
AGND
BUTTONS
TILT WHEEL*
VOLTAGE
REFERENCE
5-VOLT
USB VBUS
POWER
max
limit in the Absolute