PAW3603DH-NF Datasheet, PDF (15/32 Pages) Pixart Imaging Inc. – LOW POWER WIRELESS LASER MOUSE SENSOR

PixArt Imaging Inc.
PAW3603DH-NF
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 7. 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.
X A /Y A
X M O T IO N T O TH E R IG H T
Y M O T IO N U P
( + D IR E C TIO N )
X B /Y B
STATE3
(1 ,0 )
STATE0
(0 ,0 )
STATE1
(0,1)
STATE2
(1 ,1 )
STATE3
(1 ,0 )
STATE0
(0 ,0 )
+1
+1
+1
+1
+1
M O TIO N C O U N T
X A /Y A
X B /Y B
STATE1
(0 ,1 )
X M O T IO N TO TH E LE F T
Y M O T IO N D O W N
( - D IR E C T IO N )
STATE0
(0 ,0 )
STATE3
(1,0)
STATE2
(1 ,1 )
STATE1
(0 ,1 )
STATE0
(0 ,0 )
-1
-1
-1
-1
-1
Figure 8. Quadrature Output Waveform
M O TIO N C O U N T
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PixArt Imaging Inc.
E-mail: [e-mail]
V1.0, Aug. 2007