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ADNS-3120-001 Datasheet(PDF) 4 Page - AVAGO TECHNOLOGIES LIMITED |
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ADNS-3120-001 Datasheet(HTML) 4 Page - AVAGO TECHNOLOGIES LIMITED |
4 / 14 page 4 Microcontroller The Texas Instruments MSP430 family of ultra-low power microcontrollers consists of several devices featuring different sets of peripherals targeted for various applica- tions. The architecture, combined with five low-power modes, is optimized to achieve extended battery life in portable measurement applications. The device features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that attribute to maximum code efficiency. The Digitally Controlled Oscillator (DCO) allows wake-up from low-power modes to active mode in less than 6 µsec. The specific device used in this reference design is the MSP430F1222 with 28 pin to accommodate ample amount of I/O. It is an ultra-low power mixed-signal microcon- trollers with a built-in 16-bit timer, 10-bit A/D converter with integrated reference and Data Transfer Controller (DTC), and 14 (20 pin package) or 22 (28 pin package) general purpose I/O pins. The MSP430x12x2 series micro- controllers have built-in communication capability using asynchronous (UART) and synchronous (SPI) protocols. Serial Peripheral Interface (SPI) The MSP430F1222 provides a dedicated hardware-based Serial Peripheral Interface (SPI). The three-wire interface supports byte serial communication in either Master or Slave mode. In this reference design the MSP430F1222 always acts as the master and initiates all SPI communica- tions with external SPI device(s), in this case the ADNS- 3040. Z Wheel Quadrature Encoder A standard two-channel, incremental optical quadrature encoder and an IR LED provide the scroll wheel function. The MSP430F1222 manages the IR LED directly. Since achieving low-power consumption is one of the main ob- jectives, the Z-wheel LED is only enabled when the MSP430 needs to read the output states of the optical quadrature encoder to the MSP430 port pins while in ACTIVE mode. The Z-wheel LED is pulsed on for approximately 40 µsec every 2 msec while in ACTIVE mode to read the current position of the scroll wheel, thus saving power since the Z-wheel LED is only on for a duty cycle of 2%. The outputs of the two-channel quadrature encoder are squarewaves that are 90° out of phase. The phase relationship of these signals encodes the directions of scroll wheel rotations. Within the MSP430, an internal Quadrature Encoder Pulse (QEP) state machine interprets these signals and incre- ments or decrements a counter based on the direction and movement of the scroll wheel. Wireless RF Technology In order to provide the maximum flexibility the reference design mouse utilizes two circuit boards. The main board consists of the ADNS-3040 navigation sensor/LED, the MSP430F1222 microcontroller, the scroll wheel LED/encoder and the button switches. A 10-pin header connects the RF daughter card to the main board. The 27 MHz FSK transmitter circuit is based on a previously published reference design. Some details on ADNK-3043-TI27 The ADNK-3043-TI27 reference design kit allows users to evaluate the performance of the Optical Tracking Engine (sensor, lens, LED assembly clip, LED) over a 27 MHz RF connection. This kit also enables users to understand the recommended mechanical assembly. (See Appendix C, D and E) System Requirements PCs using Windows 95/ Windows 98/ Windows NT/ Windows 2000 with standard 3-button USB mouse driver loaded. Functionality 27 MHz wireless USB, 3-button, scroll wheel, 800 cpi USB Operating Mode The receiver dongle is hot pluggable into the USB port. The PC does not need to be powered off when plugging or un- plugging the receiver dongle for the evaluation mouse. |
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