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Multimedia Keyboard Transmitter

System Overview

DRM050 — Rev 0

Designer Reference Manual

MOTOROLA

Multimedia Keyboard Transmitter

29

 

5.2.3  DC/DC Converter

The power supply for a handheld device should be able to keep the DC 
voltage output at a constant level even though the input battery voltage 
is continuously dropping down, so a 3.3 V DC/DC converter is designed 
for the whole system, including the MCU and the baseband IC and RF 
module.

 

   

  

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Freescale Semiconductor, Inc.

For More Information On This Product,

   Go to: www.freescale.com

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Содержание DRM050

Страница 1: ...ontrollers DRM050 D Rev 0 09 2003 2 4 GHz Wireless Designer Reference Optical Mouse and Manual Multimedia Keyboard Solution Freescale Semiconductor I Freescale Semiconductor Inc For More Information O...

Страница 2: ...Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www freescale com nc...

Страница 3: ...ineering Microcontroller Division Hong Kong To provide the most up to date information the revision of our documents on the World Wide Web will be the most current Your printed copy may be an earlier...

Страница 4: ...DRM050 Rev 0 4 Revision History MOTOROLA Revision History Section Page Description of Change Throughout NA Initial Release Freescale Semiconductor I Freescale Semiconductor Inc For More Information O...

Страница 5: ...RFW D100 14 2 5 Antenna and PCB Specification 15 Section 3 Optical Mouse Transmitter 3 1 Introduction 17 3 2 System Overview 17 3 2 1 Microcontroller JB8 18 3 2 2 Optical Mouse Sensor 18 3 2 3 RF Tra...

Страница 6: ...r JB16 36 7 2 2 RF Transmission 36 7 2 3 Voltage Regulator 37 Section 8 Receiver Firmware 8 1 Receiver Firmware Structure 39 8 2 USB Report 41 8 2 1 Input Report Example 43 8 3 Remote Wakeup 44 Sectio...

Страница 7: ...ensed Industrial Scientific and Medical ISM band of 2400 2483 MHz All hardware schematic diagrams and firmware source codes are available as reference materials 1 2 Features High speed RF link in 2 4...

Страница 8: ...ilar and consist of a RF transceiver module for half duplex transmission in 2 4 GHz frequency band a baseband IC for link layer access control and protocol handling The overall system operation I O in...

Страница 9: ...detected by MCU and sent to the baseband IC in a parallel format All kinds of media access link layout control and data conversion in serial format are handled by the baseband IC The final data in ser...

Страница 10: ...System Overview Designer Reference Manual DRM050 Rev 0 10 System Overview MOTOROLA Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www freescale com nc...

Страница 11: ...RF transceiver consists of an RF transceiver module RFW102 and a link interface IC RFW D100 The RFW D100 links the MCU and the transceiver module When data is being transmitted from the mouse or keyb...

Страница 12: ...uence Spread Spectrum DSSS pulse pipe The modulation scheme is 100 MCU GPIOs JB8 LJ24 3 3V DC DC Battery Keyboard Mouse RFW 102 Module Antenna RFW D100 Serial toparallel interface Parallel Add Databus...

Страница 13: ...ully digital serial I O interface providing a simple 3 line interface Tx Rx is for controlling of the transceiver work in transmit or receive mode Act is used for switching the transceiver between wor...

Страница 14: ...so it buffers the input through a 16 byte FIFO giving the MCU access the RFW D100 efficiently Instead of reading one byte per interrupt the MCU can read up to 16 bytes in each interrupt Below are the...

Страница 15: ...e using The reference antenna of the RFWaves transceiver module RFW102 M used here is a special design printed circuit board differential loop antenna The purpose of this design is aimed at low cost s...

Страница 16: ...RF Front End Designer Reference Manual DRM050 Rev 0 16 RF Front End MOTOROLA Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www freescale com nc...

Страница 17: ...or this 2 4 GHz Wireless Optical Mouse application The main features of the reference design include 2 4 GHz RF Link 1 Mbps data rate 800 DPI Resolution Smart Power Management 3 2 System Overview The...

Страница 18: ...sign for wireless optical mouse The communication between the sensor and the JB8 is through Serial Peripheral Interface with clock input at the SCLK pin and bidirection data interface at SDIO pin The...

Страница 19: ...al will be further up converted into 2 4 GHz ISM band for final transmission 3 2 4 DC DC Converter The power supply for a handheld device should be able to keep the DC voltage output at a constant lev...

Страница 20: ...use Transmitter Designer Reference Manual DRM050 Rev 0 20 Optical Mouse Transmitter MOTOROLA Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www freesc...

Страница 21: ...e keyboard and the dongle through the baseband RFW D100 IC The MAC layer implements two interrupt functions from each of the MCUs The IRQ and one Timer Channel are used by the MAC Interface functions...

Страница 22: ...imize the performance Figure 4 1 Firmware Structure MAIN PROGRAM INIT MAC TO TRANSMIT DATA POWER MANAGEMENT INITIATE SENSOR AND RF HARDWARE GET XY DISPLACEMENT GET Z DISPLACEMENT FROM SENSOR CHECK BUT...

Страница 23: ...ion IRQ serves as the periodical wakeup signal when JB8 is in sleep mode The JB8 must check whether there is any new movement or if the buttons status changed IRQ ISR firmware will determine what appr...

Страница 24: ...XY movement is continually monitored The Z movement and buttons activities are still monitored for every ms If no XY movement happens in 5 seconds it then enters Power Saving Stage Except for the 1 ms...

Страница 25: ...tus Packet Size Reserved for Sequence Node ID Network ID byte4 Network ID byte3 Network ID byte2 Network ID byte1 Packet Size Y Displacement Z Displacement X Displacement Button Status Packet Size Res...

Страница 26: ...mitter Firmware Designer Reference Manual DRM050 Rev 0 26 Mouse Transmitter Firmware MOTOROLA Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www frees...

Страница 27: ...V It contains enough I O pins for key matrix scanning The main features of the keyboard include 2 4 GHz RF Link 1 Mbps data rate Power management keys power wake and sleep support Multimedia keys supp...

Страница 28: ...error checking The encoded data will be passed to the RF module for ASK modulation in IF band and frequency spreading with DSSS scheme The modulated signal will be further up converted into the 2 4 GH...

Страница 29: ...andheld device should be able to keep the DC voltage output at a constant level even though the input battery voltage is continuously dropping down so a 3 3 V DC DC converter is designed for the whole...

Страница 30: ...ard Transmitter Designer Reference Manual DRM050 Rev 0 30 Multimedia Keyboard Transmitter MOTOROLA Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www...

Страница 31: ...ction 4 1 MAC Layer Protocol for a description of this layer Figure 6 1 shows the flow of the main program The main tasks are to detect any key being pressed or released and then send the key code by...

Страница 32: ...Break Make byte indicates whether the packet represents a Make key CONVERT SCAN KEY NO KEY ACTIVITY FOR 10 SECOND INITIALIZATION INITIALIZATION YES SCAN KEY MATRIX CONVERT SCAN KEY NO YES ENTER POWER...

Страница 33: ...quence Node ID Network ID byte4 Network ID byte3 Network ID byte2 Network ID byte1 Packet Size Scan Code Break Make Byte Packet Size Reserved for Sequence Node ID Network ID byte4 Network ID byte3 Net...

Страница 34: ...mitter Firmware Designer Reference Manual DRM050 Rev 0 34 Keyboard Transmitter Firmware MOTOROLA Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www fr...

Страница 35: ...Interface Devices HID applications such a mouse and keyboard The main features of the receiver include 2 4 GHz RF Link 1 Mbps data rate Fully USB specification 2 0 low speed compliant Windows 98 2000...

Страница 36: ...signal will be down converted into IF band for de spreading with DSSS scheme and ASK demodulation The demodulated data in serial packet format will be converted back to parallel data and sent to the M...

Страница 37: ...from USB interface is 5 V so a 3 3 V regulator is added to provide a correct voltage 3 3 V for baseband IC and RF module The JB16 is specially design for USB application so external regulated supply i...

Страница 38: ...USB Receiver Designer Reference Manual DRM050 Rev 0 38 USB Receiver MOTOROLA Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www freescale com nc...

Страница 39: ...C908JB8 for more detail The main routine continually checks if there is any valid mouse or keyboard data from the MAC layer If so the data will be converted to USB report format and sent to the host v...

Страница 40: ...X EP2 IN REPORT YES RF PACKET RESUME FROM HOST NO NO NO YES NO NEW RECEIVED DATA IN MAC LAYER DETECTED OR CONVERT ANY MOUSE IRQ ISR DETERMINE AND SERVE NO IRQ DRIVEN BY YES RECEIVED MOUSE NEW DISABLE...

Страница 41: ...finition for Human Interface Device HID version 1 1 This interface also allows the host system to send the CAP NUM SCROLL lock status to JB16 as specified by the 1 byte output report see Table 8 2 It...

Страница 42: ...able 8 5 Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 0 Scroll Lock Caps Lock Num Lock Table 8 2 Interface 0 Output Report Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 0 Report ID 1 1...

Страница 43: ...it equals 1 since Wake key is defined as the bit 2 of the second byte Hot keys are reported through interface 1 with reported ID 2 For example if the hot key 0 and the hot key 17 are pressed the first...

Страница 44: ...to be considered The first is the small wakeup duration at each IRQ wakeup For example if the receiver is sleeping while a packet arrives the transmitter will send out a second packet because there i...

Страница 45: ...tter The DC DC converters regulators used in this reference design are for reference only customers can choose any converters regulators they prefer The LEDs for the sensor can be connected to the DC...

Страница 46: ...er to RFWaves website for details and recommendations on RF circuitry customization http www rfwaves com 9 2 2 Firmware 9 2 2 1 Mouse Transmitter Set the timing parameters for power management 9 2 2 2...

Страница 47: ...Freescale Semiconductor I Freescale Semiconductor Inc For More Information On This Product Go to www freescale com nc...

Страница 48: ...rent applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts Motorola does no...

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