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MCP2030 BIDIRECTIONAL
COMMUNICATION DEMO KIT
USER ’S GUIDE
Chapter 3. Hardware and Firmware Overview
3.1
3.2
INTRODUCTION
The following section provides an overview of the hardware and MCU firmware
algorithm used in the MCP2030 Bidirectional Communication Demo Kit.
MCP2030 BASE STATION DEMO BOARD
3.2.1
Technical Specifications
Normal Operating Voltage:
LF Frequency
(LF Command Frequency)
UHF AM Receiving Frequency:
Liquid Crystal Display (LCD):
Communication Protocols:
9 - 18V, Current Rating > 500 mA
125 kHz
433.92 MHz
2x16 characters
See Figure 2-2 , Figure 3-1 , Figure 3-2
3.2.2
Microcontroller (PIC18F4680)
The PIC18F4680 is used in this unit. The MCU provides an 125 kHz PWM for LF
command and decodes incoming Transponder responses. If the response is valid, it
displays the received data on the LCD and also blinks the LED D3. The PIC18F4680
has both a CAN controller and a LIN compatible EUSART features. The CAN and LIN
transceiver components are populated on the Base Station Demo Board, but their func-
tions are not implemented for this demo version.
3.2.3
433.92 MHz UHF Receiver Module
The Base Station Demo Board uses a 433.92 MHz AM super-regenerative compact
hybrid receiver module. The AM UHF receiver receives the responses from the
Transponder. The receiver has very high frequency stability over a wide operating
temperature and tolerance of mechanical vibrations or manual handling. The AM
receiver module has about -90 dBm of input sensitivity. The user can use their own
receiver module of any frequency of interest as long as the frequency and
modulation/demodulation method matches with those of the transmitter on the
Transponder.
3.2.4
LCD
A standard 16 pin 2x16 monochromes LCD is used to display the response from the
Transponder.
? 2006 Microchip Technology Inc.
DS51637A-page 11
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