Microchip Developer Explorer 16/32 User Manual page 12

Explorer 16/32 Development Board User's Guide - Developer Help
In order to use a canned oscillator, the unpopulated resistor pad R4 must first be
populated with a 0 ohm jumper resistor (size 0603), which will have the effect of
connecting the canned oscillator output to the P63_OSCI net, which feeds the PIM
microcontroller. Once R4 is populated, a canned oscillator (or oscillator socket) may
be installed onto either pad X2 or X4.
Pad X2 is designed to accommodate standard DIP-14 or DIP-8 canned oscillators
(with 3.3 V VDD and CMOS output capability) or sockets, while pad X4 is designed
to be used with the Microchip DSC1001 (or other DSC100x) series oscillators, in the
2.5 mm x 2.0 mm package. If using a DIP-8 canned oscillator (or oscillator socket),
the device should be installed in the bottom most four pins of pad X2 (e.g., so that
pin 1 of the DIP8 oscillator is the same pin 1, if a DIP14 oscillator were used
instead).
When using a canned oscillator it also recommended to populate C9 with a 0.01 µF
to 0.1 µF ceramic capacitor, and R94 with a ~5.1 k
canned oscillator with a standby/enable pin will be used).
Using the MCP2221A USB-Serial Converter
The MCP2221A provides USB to UART and USB to I C serial adapter functionality,
which can be used to interface the PIM microcontroller and/or other hardware to a
host (e.g., a PC serial terminal application).
On the Explorer 16/32 Development Board, the MCP2221A is accessible through
USB micro-B connector J40.
USB Driver Installation
When using the MCP2221A on a Windows® XP SP3 through Windows 8.1 USB
host, the USB drivers for the MCP2221A can be manually downloaded and installed
from this link (http://www.microchip.com/mcp2221a). Alternatively, under Windows 7
or Windows 8, the drivers may also be obtained through the Windows Update
service, provided that the machine is connected to the internet at the time of the first
attachment of the hardware, and the local policy settings enable automatic driver
searching on Windows Update.
Under Windows 10, the OS provides all necessary drivers and installation is fully
automatic, without requiring any internet connection or manual installation
procedures. Under Windows 10, it is neither necessary nor recommended to try to
manually install any additional or different drivers.
Under Mac OS® X 10.7 and later, and under most modern Linux® distributions, the
device uses operating system provided HID (Human Interface Device) and CDC-ACM
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http://microchipdeveloper.com/boards:explorer1632
pull-up resistor (if a DIP8/DIP14
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