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PAW3601DH Datasheet(PDF) 16 Page - Pixart Imaging Inc.

Part No. PAW3601DH
Description  laser diode form a complete and compact laser mouse tracking system
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Maker  PIXART [Pixart Imaging Inc.]
Homepage  http://www.pixart.com.tw
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PAW3601DH Datasheet(HTML) 16 Page - Pixart Imaging Inc.

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PixArt Imaging Inc.
PAW3601DH
CMOS Laser Mouse Sensor
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission
.
16
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
V2.2, Aug. 2007
7. Serial Interface
The synchronous serial port is used to set and read parameters in the mouse sensor, and can be used to read out
the motion information instead of the quadrature data pins.
SCLK: The serial clock line. It is always generated by the mouse controller.
SDIO: The serial data line is used to write and read data.
PD:
A third line is sometimes involved. PD (Power Down pin) is usually used to place the mouse sensor in a
low power mode to meet USB suspend specification. PD can also be used to force re-synchronization
between the mouse controller and the mouse sensor in case of an error.
7.1 Transmission Protocol
The transmission protocol is a two-wire link, half duplex protocol between the mouse controller and the mouse
sensor. All data changes on SDIO are initiated by the falling edge on SCLK. The mouse controller always
initiates communication; the mouse sensor never initiates data transfers.
The transmission protocol consists of the two operation modes:
- Write Operation.
- Read Operation.
Both of the two operation modes consist of two bytes. The first byte contains the address (seven bits) and has a
bit7 as its MSB to indicate data direction. The second byte contains the data.
A DDRE S S (7
BIT)
DA T A (8 B IT )
F IR S T BYT E
SEC O N D BYT E
MS B
LS B
R/W
(1 B IT )
MS B
LS
B
Figure 9. Transmission Protocol
7.1.1 Write Operation
A write operation, which means that data is going from the mouse controller to the mouse sensor, is always
initiated by the mouse controller and consists of two bytes. The first byte contains the address (seven bits) and
has a “1” as its MSB to indicate data direction. The second byte contains the data. The transfer is synchronized
by SCLK. The micro controller changes SDIO on falling edges of SCLK. The mouse sensor reads SDIO on
rising edges of SCLK.
SDIO driven by the mouse controller
SCLK
SDIO
1234
5678
10
A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
911 12 13
14
15
A6
DON'T
CARE
1
DON'T
CARE
16
Figure 10. Write Operation


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