ADNS-2051 Avago Technologies US Inc., ADNS-2051 Datasheet - Page 16

• Manufacturer Part Number: ADNS-2051
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2051

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q2072083C

Figure 20. Quadrature output waveform
16
Quadrature State Machine
The following state machine shows the states of the
quadrature pins. The two things to note are that while
the PD pin is asserted, the state machine is halted. Once
PD is de-asserted, the state machine picks up from where
it left off. State 0 is entered after a power up reset.
Quadrature Output Waveform
The two channel quadrature outputs are 5.0 volt CMOS
outputs. The Δx count is used to generate the XA and XB
signals, and Δy count is used for the YA and YB signals.
XB
XA
XA
XB
+1
-1
+1
-1
+1
-1
-1
+1
LEFT MOTION
(-DIRECTION)
MOTION COUNT
RIGHT MOTION
(+ DIRECTION)
MOTION COUNT
Figure 19. Quadrature state machine
PD
PD
YA
YB
YA
YB
STATE 0
STATE 1
+1
-1
-1
-1
+1
+1
-1
-1
-1
-1
STATE 2
STATE 3
-1
+1
-1
-1
PD
PD
-1
-1
STATE
0
1
2
3
OUTPUT
X AND Y
A
0
0
1
1
DOWN MOTION
(- DIRECTION)
MOTION COUNT
UP MOTION
(+ DIRECTION)
MOTION COUNT
B
0
1
0
1