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CY3274 Cypress High Voltage Programmable PLC Development Kit Guide, Doc. # 001-53598 Rev. *G
PLC Development Board
4.3
Hardware Description
The programmable high voltage PLC development board is shown in
. Key sections on the
board are highlighted.
Figure 4-1. Front View of Cypress Programmable PLC HV Development Board
The core of the PLC HV board is the CY8CPLC20 chip. The communication signal flows on this HV
board as follows:
Transmit
: CY8CPLC20 TX pin (FSK_OUT)
Transmitter Filter Circuitry
Power Amplifier Cir-
cuitry
High Voltage Powerline Coupling Circuitry
High Voltage Powerline (110 V to 240 V AC)
Receive
: High Voltage Powerline (110 V to 240 V AC)
High Voltage Powerline Coupling Circuitry
Passive Low Pass Filtering
Vdd/2 Biasing
CY8CPLC20 RX pin (FSK_IN)
The CY3274 board can be divided into seven main sections:
■
Development
■
LCD daughter card
■
RJ45 connector for debugging
■
RS232 COM port
■
High voltage with SMPS (This acts as the built in Power adaptor.)
■
Transmit amplifier and filtering
■
High voltage coupling circuit
Potentiometer (R47)
-> Connected to VR
High Voltage AC-DC
Power Supply
High Voltage PLC
Coupling Circuit
RS232 Interface
I
2
C Connector (J15)
and Jumpers
(JP1, JP3, JP4, JP5)
LCD Connector
-> Connected to Port4
Push-button (S4)
-> Connected to SW
Potentiometer (R46)
-> For LCD Contrast
Transmit Filter, Transmit
Amplifier, and Receive Filter
Reset Push-button (S2)
CY8CPLC20 PLC Device
with On-Chip Debugger (U1)
General LEDs
-> Connected to LED1-4
ISSP Programming
Connector (J21)
RJ45 Debugger
Connector (J14)
PLC RX, TX, BIU Indicator
LEDs (DS2, DS3, DS4)
AC Power
Connector (J7)
Breadboard with
surrounding GPIO headers
DIP Switch (S3)
-> Connected to J12