MCP251XFD CAN FD Motherboard User’s Guide
DS50002556A-page 16
2017 Microchip Technology Inc.
FIGURE 2-1:
mikroBUS Interface
2.2
POWER SOURCES
The MCP251XFD CAN FD Motherboard must be powered using a +5V DC regulated
power source. The user has two options to connect the power:
• USB connector (J14), or
• Test loops: 5VIN and GND1.
The jumper (JP1) is used to select between the power sources, see
Table 2-1
.
2.3
RESISTOR JUMPER SETTING ON MCP2517FD CLICK BOARD
Table 2-2
briefly describes the functions of all the board's resistor jumpers.
INT
INT1
SCL
SDA
1
2
3
4
5
6
7
8
PWM
INT
RX
TX
SCL
SDA
+5V
GND
5V
GND
J2
CLKO_SOF
INT0_XSTBY
STBY
RST
CS
SCK
MISO
MOSI
1
2
3
4
5
6
7
8
AN
RST
CS
SCK
MISO
MOSI
+3.3V
GND
3V3
GND
J1
TABLE 2-1:
POWER SOURCE JUMPERS
Index
Description
Default
Configuration
JP1
• Powers-up the MCP251XFD CAN FD Motherboard from USB or an external
5V power supply between 5VIN and GND1.
• Short-circuit pins 2 and 3 (top and middle) to select VBUS, or pins 1 and 2
(middle and bottom) to select the external power supply.
VBUS
JP2
(
1
)
Could be used to select 5V VDD for a different microcontroller.
U1 is a 3.3V microcontroller.
Note 1:
Jumper JP3 is not populated, however, it is short-circuited on the bottom layer (back) of the board. The
trace can be cut in order to disconnect it.
TABLE 2-2:
JUMPER DESCRIPTIONS
Index
Description
Default
Configuration
VIO_SEL
Selects 3.3V or 5V for VIO of the CAN FD transceiver.
3.3V
20/40 MHz
The OSC1 of the MCP2517FD can be connected to the 20 or 40 MHz clock
output of U3.
40 MHz
STBY
The STBY pin of the CAN FD transceiver can be grounded (transceiver always
in Normal mode); or controlled by the microcontroller or MCP2517FD.
Grounded
(Normal mode)
STBY_SEL Selects between the STBY output of the microcontroller or the INT0/XSTBY pin
of the MCP2517FD.
Microcontroller
(STBY header)
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