NXP Semiconductors DRM050 Reference Manual
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Multimedia Keyboard TransmitterDesigner Reference Manual DRM050 — Rev 028 Multimedia Keyboard Transmitter MOTOROLAFigure 5-1. Keyboard Block Diagram5.2.1 Microcontroller LK24The functions of the LK24 are to scan the key matrix and determine whatkeys are pressed and released, control the baseband IC to sending outdata, and perform the overall system control.5.2.2 RF TransmissionThe data from MCU will be transferred to the baseband IC for parallel toserial packet conversion as well as error checking. The encoded datawill be passed to the RF module for ASK modulation in IF band andfrequency spreading with DSSS scheme. The modulated signal will befurther up-converted into the 2.4-GHz ISM band for final transmission.2.4 GHz RFTransceiverModuleLOOPANTENNABasebandMAC ICD100DC/DC Converter3.3VOSC1OSC2PTF0-7PTC0-7PTB6-7PTA0-3PTD4-7[Externalpullup R][Externalpullup R](80-pin LQFP)RSTROW[0:7]COL[0:17]Key Matrix(8 rows x 18 columns)32.768kHz10pF 10pFX11uFMC68HC908LK24PTE7-PTE0PTA7-PTA4PTD3-PTD02MDATA BUSADDRESS / CTL BUSRFD_INT IRQFreescale Semiconductor, IFreescale Semiconductor, Inc.For More Information On This Product,Go to: www.freescale.comnc... |
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