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PAN3201DH Datasheet(PDF) 14 Page - Pixart Imaging Inc.

Part No. PAN3201DH
Description  LOW POWER CMOS OPTICAL MOUSE SENSOR
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Maker  PIXART [Pixart Imaging Inc.]
Homepage  http://www.pixart.com.tw
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PAN3201DH Datasheet(HTML) 14 Page - Pixart Imaging Inc.

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PixArt Imaging Inc.
PAN3201DH
CMOS Optical Mouse Sensor
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission
.
14
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
V1.0, Mar. 2006
6. Serial Interface
The synchronous serial port is used to set and read parameters in the PAN3201DH, 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 host micro-controller.
SDIO: The serial data line used for write and read data.
PD:
A third line is sometimes involved. PD(Power Down pin) is usually used to place the PAN3201DH in a
low power mode to meet USB suspend specification. PD can also be used to force re-synchronization
between the micro-controller and the PAN3201DH in case of an error.
6.1 Transmission Protocol
The transmission protocol is a two-wire link, half duplex protocol between the micro-controller and
PAN3201DH. All data changes on SDIO are initiated by the falling edge on SCLK. The host micro-controller
always initiates communication; the PAN3201DH 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.
ADDRESS (7 BIT)
DATA (8 BIT)
FIRST BYTE
SECOND BYTE
MSB
LSB
R/W
(1 BIT)
MSB
LSB
Figure9. Transmission Protocol
6.1.1 Write Operation
A write operation, which means that data is going from the micro-controller to the PAN3201DH, is always
initiated by the micro-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 PAN3201DH reads SDIO on
rising edges of SCLK.
SDIO driven by Micro-controller
SCLK
SDIO
123
456
78
10
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
9
1112
1314
15
A6
DON'T
CARE
1
DON'T
CARE
16
Figure10. Write Operation


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