PAW3602DH Datasheet, PDF (13/32 Pages) Pixart Imaging Inc. – CMOS LASER MOUSE SENSOR

PixArt Imaging Inc.
PAW3602DH
CMOS Laser Mouse Sensor
6.2 Quadrature Output State Machine
The following state machine shows the states of the quadrature output pins. The three things to note are that state
0 is entered after a power on reset. 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. During times of mouse no movement will entry power
saving mode, until mouse was moved.
PD
POWER ON RESET
+ ^{DIREC-TDIIORNECTION}
STATE 0
(0,0)
- _{DIREC+TIDOINRECTION}
PD
STATE 1
(0,1)
STATE 3
(1,0)
PD
+ _{DIRECTI-ODNIRECTION}
STATE 2
(1,1)
- ^{DIREC+TDIOIRNECTION}
X/Y output
STATE
XA/YA XB/YB
0
0
0
1
0
1
2
1
1
3
1
0
PD
Figure 5. State machine
6.3 Quadrature Output Waveform
The following diagrams show the waveform of the two channel quadrature outputs. If the X, Y is motionless, the
(XA, XB), (YA, YB) will keep in final state. Each state change (ex. STATE2 → STATE3) is one count.
XA/YA
X MOTION TO THE RIGHT
Y MOTION UP
( + DIRECTION )
XB/YB
STATE3
(1,0)
STATE0
(0,0)
STATE1
(0,1)
STATE2
(1,1)
STATE3
(1,0)
STATE0
(0,0)
XA/YA
XB/YB
+1
+1
+1
+1
+1
MOTION COUNT
X MOTION TO THE LEFT
Y MOTION DOWN
( - DIRECTION )
STATE1
(0,1)
STATE0
(0,0)
STATE3
(1,0)
STATE2
(1,1)
STATE1
(0,1)
STATE0
(0,0)
-1
-1
-1
-1
-1
Figure 6. Quadrature output waveform
MOTION COUNT
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PixArt Imaging Inc.
E-mail: [e-mail]
V1.0, Jun. 2007