CY8CKIT-017 CAN/LIN Expansion Board Kit Guide, Doc. # 001-57814 Rev. *D
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Hardware
4.5.1
Jumper Settings of CY8CKIT-001 DVK for Using Port B
Port B uses the port 2 GPIO pins to connect to two of the LEDs and the two LIN transceiver circuits
on the expansion board. Therefore, switch the jumper J12 to ‘Off’ position; this switches off the
power for the character LCD that is connected to port 2 of the CY8CKIT-001 DVK. This means that
the LCD on the DVK cannot be used when the port 2 GPIO pins are used and the expansion board
is occupying port B of the DVK.
It is possible to use the EBK for CAN on port B of the DVK along with the LCD of the DVK. In this
case, the LEDs and both LIN circuits on the EBK should be isolated from the 2x20 header by
removing the corresponding 0-
resistors on the expansion board.
Figure 4-6. J12 Jumper in Off Position
4.5.2
Debugging Restrictions When Using Port B
When the CY8CKIT-017 EBK occupies port B, debugging is possible only through Serial Wire
Debug (SWD) interface. It is not possible through JTAG and Serial Wire Viewer (SWV) debug
interfaces because expansion board circuits conflict with GPIO pins of these (JTAG and SWV)
interfaces.
4.6
Power Supply Configurations
By default, the CAN/LIN expansion board is powered from the CY8CKIT-001 DVK through the 40-pin
(2×20) connector.
The expansion board has a selection jumper on it (JP6) that must be set correctly to match the
power settings of the DVK. This jumper can be set to power up the circuits on the expansion board
with the V5_0, V3_3, or VADJ power supplies from the DVK board.
The CAN transceiver circuit only works when it is powered with 5 V. Therefore, JP6 must be set to
the V5_0 setting when using CAN. The LIN circuits can works at either the V5_0 or the V3_3 power
supplies.
The expansion board has a pin on each CAN and LIN header (P2, P4, and P5) that can be
connected to the VIN power supply of the DVK. One reason to use this is if there are two CY8CKIT-
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P12_0
P12_0
P12_0
SCL
35
V3_3
V3_3
V3_3
V3_3
36
VADJ
VADJ
VADJ
VADJ
37
GND
GND
GND
GND
38
V5_0
V5_0
V5_0
V5_0
39
VIN
VIN
VIN
VIN
40
GND
GND
GND
GND
Pin
Port A
Port B
Port C
CAN/LIN EBK