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cybiko:functionalblockdiagram [2009/11/27 17:54] (current)
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 +======Cybiko Functional Block Diagram======
 +
 +{{ block_diagram.gif?​760 }}
 +
 +The tranceiver module is based on the IC RF2915, (RF MICRO-DEVICES INC) which was specially designed for wireless data transciever and IC LMXS2315. ​ Functionally,​ the IC RF2915 provides a monolithic superhetrodyne receieve and a FM transmitter. ​ The main building block (RSSI), FM demodulator and Data Amplifier. ​ The receiver also utilizes the on-chip VCO.  The FM transmitter includes variable gain amplifier, power amplifier (PA) and on chip VCO.
 +
 +A message to be transmitted is packed by the MCU HD6472246 into frames with 50 or 200 bytes lengths and sent to the MCU AT90S2313. ​ The MCU AT90S2313 encodes the frames by adding synchronization bits and sends with Manchester encoding.
 +
 +The data stream coming from the controller AVR goes through a low-pass filter LPF1 to the varactor diode V1 that modulates the frequency of the VCO.  The low-pass filter helps to limit the bandwidth occupied by the transmitter. ​ RF signal from TX OUT RF2915 goes through RF filter to the permenantly attached antenna A1.
 +
 +Receiving frequency modulation signal from antenna pass through RF filter in RX IN pin on RF2915. ​ From out RF2915 (pin 29) the signal goes through a low-pass filter LPF2 to the AT90S2313 for decoding, and then frames come to the MCU6472246 for further processing.
 +
 +The DC/DC converters LT1613 and LT1615 are used to generate a fixed power supply voltage of 3.3V for all IC and 17.8V for LCD.
 +
 +The DC/DC converters is designed for the application of 2 NiMa cells.\\
 +The LMX2315 is high performance frequency synthesizers with integrated prescalers.
 +
 +Serial data is transferred into the LMX2315 from the MCU AT90S2313 via a three line interface (Data, Enable, Clock)
 +
 +the PCF8593 is a CMOS clock/​calendar circuit, optimized for low power consumption.\\
 +Addresses and data are transferred serially in the MCU via the two-line bi-directional I2C bus.  He has built-in 32.768kHz oscillator circuit.
 +----
 +These documents have been combined on this page
 +  * {{block_diagram.pdf|Block Diagram}}
 +  * {{block_diagram_desc.pdf|Block Diagram Description}}
 +