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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ADNS3040 Scheda tecnica(PDF) 11 Page - Agilent(Hewlett-Packard) |
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ADNS3040 Scheda tecnica(HTML) 11 Page - Agilent(Hewlett-Packard) |
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11 / 26 page  11 Power management modes The ADNS-3040 has three power-saving modes. Each mode has a different motion detection period, affecting response time to mouse motion (Response Time). The sensor automatically changes to the appropriate mode, depending on the time since the last reported motion (Downshift Time). The parameters of each mode are shown in the following table. Motion Pin Timing The motion pin is a level- sensitive output that signals the micro-controller when motion has occurred. The motion pin is lowered whenever the motion bit is set; in other words, whenever there is data in the Delta_X or Delta_Y registers. Clearing the motion bit (by reading Delta_Y and Delta_X, or writing to the Motion register) will put the motion pin high. LED Mode For power savings, the LED will not be continuously on. ADNS-3040 will flash the LED only when needed. Chip Select Operation The serial port is activated after NCS goes low. If NCS is raised during a transaction, the entire transaction is aborted and the serial port will be reset. This is true for all transactions. After a transaction is aborted, the normal address-to-data or transaction-to-transaction delay is still required before beginning the next transaction. To improve communication reliability, all serial transactions should be framed by NCS. In other words, the port should not remain enabled during periods of non- use because ESD and EFT/B events could be interpreted as serial communication and put the chip into an unknown state. In addition, NCS must be raised after each burst- mode transaction is complete to terminate burst-mode. The port is not available for further use until burst-mode is terminated. Synchronous Serial Port The synchronous serial port is used to set and read parameters in the ADNS-3040, and to read out the motion information. The port is a four wire serial port. The host micro- controller always initiates communication; the ADNS- 3040 never initiates data transfers. SCLK, MOSI, and NCS may be driven directly by a micro-controller. The port pins may be shared with other SPI slave devices. When the NCS pin is high, the inputs are ignored and the output is tri- stated. The lines that comprise the SPI port: SCLK: Clock input. It is always generated by the master (the micro-controller). MOSI: Input data. (Master Out/Slave In) MISO: Output data. (Master In/Slave Out) NCS: Chip select input (active low). NCS needs to be low to activate the serial port; otherwise, MISO will be high Z, and MOSI & SCLK will be ignored. NCS can also be used to reset the serial port in case of an error. Mode Response Time (nominal) Downshift Time (nominal) Rest 1 16.5 ms 237 ms Rest 2 82 ms 8.4 s Rest 3 410 ms 504 s |
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