PDF ADNS-3040 Data sheet ( Hoja de datos )

Número de pieza	ADNS-3040
Descripción	Optical Mouse Sensor
Fabricantes	Agilent Technologies
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No Preview Available ! Agilent ADNS-3040 Ultra Low-Power Mouse Sensor Data Sheet Features mDescription oThe ADNS-3040 is an ultra .clow-power optical navigation sensor. It has a new, low- power architecture and Uautomatic power management modes, making it ideal for t4battery-and power-sensitive applications such as cordless einput devices. eThe ADNS-3040 is capable of high-speed motion detection – hup to 20 ips and 8G. In addition, it has an on-chip Soscillator and LED driver to minimize external components. taThe ADNS-3040 along with the ADNS-3120-001 lens, ADNS- a2220 clip and HLMP-ED80- PS000 LED form a complete .Dand compact mouse tracking system. There are no moving parts, which means high wreliability and less maintenance for the end user. In addition, wprecision optical alignment is mnot required, facilitating high w ovolume assembly. .cThe sensor is programmed via Uregisters through a four-wire t4serial port. It is packaged in a www.DataShee20-pin DIP. Theory of Operation The ADNS-3040 is based on Optical Navigation Technology, which measures changes in position by optically acquiring sequential surface images (frames) and mathematically determining the direction and magnitude of movement. The ADNS-3040 contains an Image Acquisition System (IAS), a Digital Signal Processor (DSP), and a four wire serial port. The IAS acquires microscopic surface images via the lens and illumination system. These images are processed by the DSP to determine the direction and distance of motion. The DSP calculates the ∆x and ∆y relative displacement values. An external microcontroller reads the ∆x and ∆y information from the sensor serial port. The microcontroller then translates the data into PS2, USB, or RF signals before sending them to the host PC or game console. • Low power architecture • Self-adjusting power-saving modes for longest battery life • High speed motion detection up to 20 ips and 8G • SmartSpeed self-adjusting frame rate for optimum performance • Motion detect pin output • Internal oscillator – no clock input needed • Selectable 400 and 800 cpi resolution • Wide operating voltage: 2.5V-3.6V nominal • Four wire serial port • Minimal number of passive components Applications • Optical Mice • Optical trackballs • Integrated input devices • Battery-powered input devices 1 page PCB Assembly Considerations 1. Insert the sensor and all other electrical components into PCB. 2. Insert the LED into the assembly clip and bend the leads 90 degrees. 3. Insert the LED/clip assembly into PCB. 4. Wave Solder the entire assembly in a no-wash solder process utilizing solder fixture. The solder fixture is needed to protect the sensor during the solder process. It also sets the correct sensor-to-PCB distance as the lead shoulders do not normally rest on the PCB surface. The fixture should be designed to expose the sensor leads to solder while shielding the optical aperture from direct solder contact. 5. Place the lens onto the base plate. 6. Remove the protective kapton tape from optical aperture of the sensor. Care must be taken to keep contaminants from entering the aperture. Recommend not to place the PCB facing up during the entire mouse assembly process. ADNS-3040 VDD AVDD GND AGND SHTDWN XY_LED Image Array DSP Oscillator LED Drive NCS SCLK MOSI MISO MOTION Figure 6. Block diagram of ADNS-3040 optical mouse sensor Recommend to hold the PCB first vertically for the kapton removal process. 7. Insert PCB assembly over the lens onto the base plate aligning post to retain PCB assembly. The sensor aperture ring should self- align to the lens. 8. The optical position reference for the PCB is set by the base plate and lens. Note that the PCB motion due to button presses must be minimized to maintain optical alignment. 9. Install mouse top case. There MUST be a feature in the top case to press down onto the clip to ensure all components are interlocked to the correct vertical height. Design considerations for improved ESD Performance For improved electrostatic discharge performance, typical creepage and clearance distance are shown in the table below. Assumption: base plate construction as per the Agilent supplied IGES file and ADNS-3120-001 lens. Typical Distance Creepage Clearance Millimeters 16.0 2.1 Sensor Clip LED Lens / Light Pipe PCB Base Plate Surface Figure 7. Sectional view of PCB assembly highlighting optical mouse components Note that the lens material is polycarbonate and therefore, cyanoacrylate based adhesives or other adhesives that may damage the lens should NOT be used. 5 5 Page 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. Mode Rest 1 Rest 2 Rest 3 Response Time (nominal) 16.5 ms 82 ms 410 ms Downshift Time (nominal) 237 ms 8.4 s 504 s Synchronous Serial Port Chip Select Operation 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) 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. 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. 11 11 Page

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