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HLMP-ED80-PS000 Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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HLMP-ED80-PS000 Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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3 / 14 page  3 Figure 3. Optics Quadrature Signal Generation Z Wheel The motion of Z-wheel is detected using the quadrature signal generated by optical sensors. Two phototransistors are connected in a source-follower configuration forming Channel A and Channel B . An infrared LED shines, causing the phototransistors to turn on. In between the phototran- sistors and the LED is a pinwheel that rotates. The spokes of this pinwheel is mechanically designed to interrupt the infrared light such that the phototransistors are turned on and off in a quadrature output pattern. Every change in the phototransistor outputs represents a count of Z-wheel movement. Comparing the last state of the optics to the current state derives directional information. As shown in Figure 3 below, rotating the wheel forward produces a unique set of state transitions, and rotating the wheel backward produces another set of unique state transi- tions. Hardware Implementation Optical Mouse Sensor This reference design features the ADNS-3040 optical navigation engine. It contains an Image Acquisition System (IAS), a Digital Signal Processor (DSP), and a four-wire Serial Peripheral Interface consists of the serial clock (SCLK), the master-in/slave-out (MISO) and the master-out/slave-in (MOSI). In addition a fourth signal chip select (NCS) is used to select the device on the SPI buss. Motion, is an addi- tional output from the ADNS-3040 intended to act as an interrupt to the microcontroller whenever the ADNS-3040 senses motion. When the mouse is moved the ADNS-3040 alerts the system controller by activating the Motion signal triggering an interrupt service routine. At the same time the ADNS-3040 accumulates the horizontal and vertical displacements (count per inch, or cpi) in its Delta_X and Delta_Y registers respectively. The ADNS-3040 deactivates the Motion signal as soon as movement stops. The Smart- Speed technology automatically optimizes the frame rate by examining the acquired images of the surface. It also manages the integrated LED driver to coordinate with the shutter. The system controller reads the motion information and reports it to the PC to update the cursor position. The advantages of using ADNS-3040 optical sensor are the efficient power management, high tracking accuracy, and simple communications with the microcontroller via the full duplex SPI port. Tolearnmoreaboutsensor’stechnicalinformation,pleasevisitthe Avagowebsiteathttp://www.avagotech.com Mouse Buttons Mouse buttons are connected as standard switches. These switches are pulled up by the pull up resistors inside the microcontroller. When the user presses a button, the switch will be closed and the pin will be pulled LOW to GND. A LOW state at the pin is interpreted as the button being pressed. A HIGH state is interpreted as the button has been released or the button is not being pressed. Normally the switches are debounced in firmware for 15-20ms. In this reference design there are three switches: left, Z-wheel, and right. |
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