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It has a new low-power architecture and automatic power management modes, making it ideal for battery, power-sensitive applications — such as cordless input devices. In addition, it has an on-chip oscillator and LED driver to minimize external components.
There are no moving parts, which agago high reliability and less maintenance for the end user. In addition, precision optical alignment is not required, facilitating high volume assembly. It is housed in an 8-pin staggered dual in-line package DIP. The IAS acquires microscopic surface images via the lens and illumination system. These images are aavgo by the DSP to determine the direction and distance of motion.
An external microcontroller reads the Dx and Dy information from the sensor serial port. Package outline drawing top view.
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There is an aperture stop and features on the package that align to the lens. Recommended PCB mechanical cutouts and spacing. Features on the lens align it to the sensor, base plate, and clip with the LED. PCB Assembly Considerations 3. Wave solder the entire assembly in a no-wash solder process utilizing solder fixture.
The acago fixture is needed to protect the sensor during the solder process. The fixture should be designed to expose the sensor leads to solder while shielding the optical aperture from direct solder contact.
Place the lens onto the base plate. 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. Recommend to hold the PCB first vertically for the kapton removal process. The sensor aperture ring should self-align to the lens. Install mouse top case. There MUST be a feature in the top case to press down onto the PCB assembly to ensure all components are interlocked to the correct vertical height.
A3200 the LED into the assembly clip and bend the leads 90 degrees. 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. Insert the sensor and all other electrical components into PCB. Block diagram of ADNS optical mouse avvago. Design Considerations for Improved ESD Performance For improved electrostatic discharge performance, typical creepage and clearance distance are shown in the table below.
Typical Distance Millimeters Creepage Sectional view of PCB assembly highlighting optical mouse components. Schematic diagram for interface between ADNS and microcontroller cordless application. Distance from lens reference plane to tracking surface Z.
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No load on MISO. Each mode has a different motion detection period, affecting response time to mouse motion Response Time. The sensor automatically changes to the vaago mode, depending on the time since the last reported motion Downshift Time. The parameters of each avaago are shown in the following table. It is always generated by the master the micro-controller.
Chip select input active low. NCS can also be used to reset the serial port in case of an error. 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 addition, NCS must be raised after each burstmode 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, and to read out the motion information. The port is a four wire serial port. The host micro-controller always initiates communication; the ADNS never initiates data transfers. Avzgo 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. Write Operation Write operation, defined as data going from the microcontroller to the ADNS, is always initiated by the micro-controller and consists of two bytes. The second byte contains the data. The speed improvement is achieved by continuous data clocking to or from multiple registers without the need to specify the register address, and by not requiring the normal delay period between data bytes.
A full reset will thus be executed. Any register settings must then be reloaded. After sending the register address, the micro-controller must wait tSRAD and then begin reading data. All data bits can be read with no delay between bytes by driving SCLK at the normal rate.
The data are latched into the output buffer after the last address bit is received. The serial port is not available for use until it avag reset with NCS, even for a second burst transmission.
Avago Technologies highly recommends the usage of burst mode operation in optical mouse sensor design applications. During power-up there will be a period of time after the power supply is high but before any clocks are available.
The table below shows the state of the various pins during power-up and reset. In addition, the SPI port should not be accessed during power down. The table below shows the state of various avzgo during power down.
It can be in either state if the sensor is the only device in addition to the controller microprocessor. There is long wakeup time from power down. This feature should not be used for power management during normal mouse motion.
The registers are used to read motion data and status as well as to set the device configuration. This register contains a unique aago assigned to the ADNS The value in this register does not change; it can be used to verify that the serial communications link is functional.
This register contains avagk IC revision. It is subject to change when new IC versions are released. Register 0x02 allows the user to determine if motion has occurred since the last time it was read.
If the MOT bit is set, then the user should read registers 0x03 and 0x04 to get the accumulated motion. The written data byte is not saved. X movement is counts since last report.
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Absolute value is determined by resolution. Reading clears the register. Y movement is counts since last report. The graph below shows sequentially acquired SQUAL values, while a sensor was moved slowly over white paper.
SQUAL is nearly equal to zero, if there is no surface below the sensor. SQUAL is typically maximized when the navigation surface is at the avagoo distance from the imaging lens the nominal Zheight. Squal White paper 90 Squal value 80 70 60 50 40 30 20 10 0 1 Count Figure Squal values white paper. Units are clock cycles. They should be read consecutively. The shutter is adjusted to keep the average and maximum pixel values within normal operating ranges. The shutter value is automatically adjusted.
Maximum Pixel value in current frame. The maximum pixel value can vary with every frame. This register is the afago pixel value from the last image taken. The maximum accumulator value is 28, but only bits [ It may be described as the full sum divided by 1. The maximum register value is The minimum is 0. The pixel sum value can change on every frame. Minimum Pixel value in current frame.