User manual

 2015 Microchip Technology Inc. DS40001804A-page 17
CURIOSITY DEVELOPMENT BOARD
USER’S GUIDE
Appendix B. General Notes
B.1 POWER
When the Curiosity board is USB-powered though a 5V supply rather than a USB port
on a computer, MCLR
is held in Reset for approximately five seconds.
B.2 RN4020 BLUETOOTH
®
LOW ENERGY (BLE) MODULE
1. The RN4020 Bluetooth Low Energy (BLE) module must be configured before
use. This can be achieved by either of the following methods:
a) Connecting the UART TX and RX lines to an external UART-to-USB bridge,
such as the MCP2200, and using a terminal program to communicate with
and program the BLE module
b) Writing custom firmware and programming the BLE module through the PIC
MCU.
2. The Wake_HW line (pin 15 of the RN4020) was not connected, but is now
recommended. This line must be connected for proper BLE functionality. See the
RN4020 Bluetooth
®
Low Energy Module Command Reference User’s Guide
(DS70005191) for more information.
B.3 CLICK OR RN4020 MODULES
Shared UART TX and RX lines supply connection to either the RN4020 BLE module or
a Click module (which uses UART for communication with the PIC MCU), but not both.
B.4 DEBUGGING MODE
During Debug mode, LED D5 is not available to the user. This was done to provide
out-of-the-box LED access to Microchip’s 8-pin MCUs. There are zero-ohm-resistors in
series that can be removed to allow connection to another pin, if desired.
B.5 ROUTING AND FLEXIBILITY
Pinouts to the various connections provide connectivity to many devices. With
zero-ohm-resistors in series to all connections, i.e., the mikroBUS™, TouchPad, and
LEDs, the board can be modified for many situations without cutting the printed circuit
board (PCB) traces.