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PAN301A Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers

Part No. PAN301A
Description  CMOS HIGH PERFORMANCE OPTICAL MOUSE SENSOR
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Maker  ETC2 [List of Unclassifed Manufacturers]
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PAN301A Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers

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PixArt Imaging Inc.
PAN301A
CMOS Optical Mouse Sensor
5.2 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
5.3 Quadrature Output Waveform
Figure 7. State machine
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 8. Quadrature output waveform
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission
.
13
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
V1.3, MAY. 2004


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