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OLIMEX© 2017
PIC32-EMZ64 user's manual
CHAPTER 6: JUMPERS, CONNECTORS AND INTERFACES
In this chapter you will find the description of the jumpers and what signals might be found on the
different connectors.
6.1 JUMPER DESCRIPTION
Jumpers are used to alter the default hardware configuration of the board. PIC32-EMZ64 uses both
PTH and SMT jumpers.
6.1.1 USB connector jumpers
On the top of the board there are three easy to re-configure PTH jumpers named
“DEV_DM/HOST_DM”; “DEV_DP/HOST_DP”; “DEV_ID/HOST_ID”. Changing the jumpers
changes the routing of the D-, D+ and USB_ID signals. The position of these jumpers determines
whether the USB_HOST or the USB_DEV connectors would be enabled. Only one of the USB
connectors can be enabled at a time (or if all jumpers are removed both USB connectors would be
disabled). You can't have both USB_HOST and USB_DEV enabled simultaneously.
Important! The three jumpers have to me moved together! There are only three valid configurations
– all jumpers to right position (to enable USB type A connector “USB_HOST”), all jumpers to left
position (to enable micro USB connector “USB_DEV”), or all jumper removed (to disable both
USB connectors).
By default the jumpers are set to right positions – the USB type A connector is enabled.
6.1.2 CAN_T jumper
CAN_T jumper is an SMT jumper located at the bottom of the board. It configures whether to have
a 120 Ohm termination resistor connected between CANL and CANH signal lines.
By default CAN_T is open – the 120 Ohm termination resistor between CANL and CANH is
disconnected.
Note that changing SMT jumpers requires soldering. To close such a jumper solder the pads
together. To disconnect an SMT jumper – remove any solder and/or cut between the pads (in case
the jumper is closed by default).
6.1.3 5V/3.3V jumper
This is another SMT jumper. It is related to the powering of the MCP2551 CAN transceiver. By
default it is set to 5V operating voltage since MCP2551 requires 5V. This jumper was added for
future design compatibility with other CAN transceivers that work at 3.3V.
It is not recommended to change the default position of this 5V/3.3V jumper, unless you also
change MCP2551 with another CAN transceiver that requires only 3.3V.
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