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ADNS-2051 Datasheet(PDF) 17 Page - Agilent(Hewlett-Packard) |
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ADNS-2051 Datasheet(HTML) 17 Page - Agilent(Hewlett-Packard) |
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17 / 40 page  17 Synchronous Serial Port The synchronous serial port is used to set and read parameters in the ADNS-2051, and can be used to read out the motion infor- mation instead of the quadrature data pins. The port is a two wire, half duplex port. The host micro-controller always initiates communication; the ADNS-2051 never initiates data transfers. SCLK: The serial port clock. It is always generated by the master (the micro- controller). SDIO: The data line. PD: A third line is sometimes involved. PD (Power Down) is usually used to place the ADNS-2051 in a low power mode to meet USB suspend speci- fication. PD can also be used to force re-synchro- nization between the micro-controller and the ADNS-2051 in case of an error. Write Operation Write operations, where data is going from the micro-controller to the ADNS-2051, is always initi- ated 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 sec- ond byte contains the data. The transfer is synchronized by SCLK. The micro-controller changes SDIO on falling edges of SCLK. The ADNS-2051 reads SDIO on rising edges of SCLK. Figure 25. Write operation. Figure 26. SDIO setup and hold times SCLK pulse width. 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 D0 D5 D6 D7 A0 A1 A2 A3 A4 A5 A6 D4 D3 D2 D1 SCLK CYCLE # SCLK SDIO DON'T CARE SDIO DRIVEN BY MICRO-CONTROLLER 120 ns 120 ns 120 ns, MIN. tsetup = 60 ns, MIN. SCLK SDIO |
Similar Part No. - ADNS-2051 |
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Similar Description - ADNS-2051 |
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