PixArt Imaging Inc.

PAW3602DH

CMOS Laser Mouse Sensor

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PixArt Imaging Inc.

V1.0, Jun. 2007

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.

STATE 0

( 0 , 0 )

POWER ON RESET

STATE 1

( 0 , 1 )

STATE 3

( 1 , 0 )

STATE 2

( 1 , 1 )

PD

STATE

X/Y output

XA/YA XB/YB

0

1

2

3

00

0

1

1

1

10

PD

PD

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

XB/YB

X MOTION TO THE RIGHT

Y MOTION UP

( + DIRECTION )

STATE0

( 0 , 0 )

STATE1

( 0 , 1 )

STATE2

( 1 , 1 )

STATE3

( 1 , 0 )

+1

+1

+1

+1

MOTION COUNT

STATE3

( 1 , 0 )

STATE0

( 0 , 0 )

+1

XA/YA

XB/YB

X MOTION TO THE LEFT

Y MOTION DOWN

( - DIRECTION )

STATE0

( 0 , 0 )

STATE3

( 1 , 0 )

STATE2

( 1 , 1 )

STATE1

( 0 , 1 )

-1

-1

-1

-1

MOTION COUNT

STATE1

( 0 , 1 )

STATE0

( 0 , 0 )

-1

Figure 6. Quadrature output waveform