Microchip Developer Explorer 16/32 User Manual page 8

Explorer 16/32 Development Board User's Guide - Developer Help
J25
J26
J27
J28
J29
J33
J37
J38
J39
J41
J42
J43
J44
J45
J50
Additional details of each jumper and their intended purpose/usage are described
below:
JP2 – Jumper JP2 can be opened to effectively disable the LEDs D3-D10 on the
Explorer 16/32 board, so as to minimize loading of the I/O pins connected to the
LEDs. In order to use any of the LEDs D3-D10 as indicators, JP2 must be capped.
J19 – Connects to the PIM pin P82 and the LCD R/W pin. When the jumper is
capped, this allows the PIM microcontroller firmware to read from the LCD module.
When the jumper is left open, the LCD R/W pin is pulled low by R116, putting the
LCD in write only mode. In general, it is usually not necessary to read from the LCD,
and it is preferable to leave J19 open. When the LCD module is in write only mode,
the module I/O pins will be tri-stated (albeit with weak internal pull ups in the
module), which prevents I/O contention with the microcontroller firmware, if/when the
application code uses the I/O pins connected to the LCD module for other purposes.
J22 – Connects to the PIM P96_VBUSON net and when capped in the 2-3 position,
enables the PIM microcontroller firmware to turn on/off the USB Type-C™ connector
+5V VBUS power supply (output to an attached USB device). The USB Type-C
specifications indicate that hosts should first detect the presence of an attached
USB device, prior to enabling the +5V VBUS output to the USB connector (so as to
avoid potentially harmful current flows if two hosts or power sourcing devices are
connected together). For engineering development/testing convenience, jumper
position 1-2 continuously enables the +5V VBUS output onto the USB Type-C
connector, but this jumper position is generally not recommended for normal use, as
8 z 18
USB Signal Quality/P90_USBDP to PICtail+ access connection
USB Signal Quality/P89_USBDN to PICtail+ access connection
EEPROM U4 Chip Select disconnect
USB Type-C host/device Configuration Channel 1 select (CC1)
USB Type-C host/device Configuration Channel 2 select (CC2)
USB Host VBUS Over Current detect signal
UART RX to MCP2221A connection
UART TX to MCP2221A connection
Temperature sensor U4 disconnect
2
MCP2221A I C SDA signal disconnect
2
MCP2221A I C SCL signal disconnect
9V rail current measurement test point
5V rail current measurement test point
3.3V rail current measurement test point
PIM_VDD rail current measurement test point
http://microchipdeveloper.com/boards:explorer1632
7.6.2017 8:59