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PAN3201DH Datasheet(PDF) 14 Page - Pixart Imaging Inc. |
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PAN3201DH Datasheet(HTML) 14 Page - Pixart Imaging Inc. |
14 / 25 page 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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