CY3274 Cypress High Voltage Programmable PLC Development Kit Guide, Doc. # 001-53598 Rev. *G
45
PLC Development Board
JP4 (I2C-SDA)
This is a pull-up jumper. While communicating through I2C (J15), one side
has to pull up the line. When the jumper is connected, the SDA line is pulled
high. This needs to be done when the user wants the I2C link to be pulled up
by the CY3274 board.
This jumper does not need to be placed if the USB-I2C bridge is used for
communication to the host.
JP3 (I2C-SCL)
This is a pull-up jumper. While communicating through I2C (J15), one side
has to pull up the line. When the jumper is connected, the SCL line is pulled
high. This needs to be done when the user wants the I2C link to be pulled up
by the CY3274 board.
This jumper does not need to be placed if the USB-I2C bridge is used for
communication to the host.
J15
V – V
DD
. This pin can provide a maximum of 50 mA at 5 V to an external
board. This pin is only to source the current. DO NOT SUPPLY POWER TO
THIS PIN FOR POWERING CY8CPLC20 DEVICE. Note that the PWR
jumper (JP1) needs to be connected to enable this functionality.
G – Gnd. The Gnd pin can provide the ground reference to an external
board. This pin connects to the ground plane of the CY3274 board.
D – I
2
C data (SDA). The I
2
C data pin is the data line for the I2C communi-
cation. This pin is directly connected to the CY8CPLC20 device. See appro-
priate I2C-SDA jumper (JP4) settings before connecting I2C bus to this pin.
C – I
2
C clock (SCL). The I
2
C clock pin is the clock line for the I2C commu-
nication. This pin is directly connected to the CY8CPLC20 device. See
appropriate I2C-SCL jumper (JP3) settings before connecting I2C bus to
this pin.
R – Reset. Connecting this pin to an external board enables the
CY8CPLC20 chip to be reset by an external board. Note that the RES
jumper (JP5) needs to be connected to enable this functionality.
LCD Contrast[R46]
Adjusting this potentiometer adjusts the contrast on the LCD Daughter Card.
LED1-LED4
Headers connected to general purpose configurable LEDs.
PWR LED[DS1]
Blue LED that glows when the board is powered on.
P01, P02, P04, P07
Free analog/digital port pins
P15
Port pin connected to SDA for I2C
P16, P12
Free port pins
P17
Port pin connected to SCL for I2C
P21
Port pin connected to yellow LED for BIU
P23
Port pin connected to red LED for RX
P25
Port pin connected to green LED for TX
P26
Free port pin
P30, P31, P32, P33, P34,
P35, P36, P37
Free port pins
P40-P46
Port pins connected to LCD card
P47
Free port pin
P50, P51, P52, P53
Free port pins
Headers and Jumpers
Description
