Microchip Developer Explorer 16/32 User Manual page 6

Explorer 16/32 Development Board User's Guide - Developer Help
available
/0ohr115y3h27gpw3qhbe61d2urrmq4mz.pdf).
Powering the Explorer 16/32 Development Board
The Explorer 16/32 board can be powered from any one or more of four different
connectors: USB micro-B for PKOB (J18), USB Type-C (J24), USB micro-B for
USB-Serial converter (J40), or the DC barrel jack (J12). The three USB power
sources are effectively (Schottky) diode OR-ed together, and sent through a current
limiting/inrush limiting/short circuit protection circuit, before feeding the 5 V rail on
the board. A summary of the typical output voltage and current capability of each
power supply rail based on the type of power source provided is as follows:
Power Source
USB only
"9 V" DC barrel plug
For applications requiring a true 9 V rail, 3.3 V / 5 V rail currents exceeding 400 mA,
or applications requiring a well regulated 5 V rail (ex: USB host applications), it is
recommended to power the Explorer 16/32 board through the dedicated DC barrel
jack J12. The board accepts center pin positive 8 V - 15 V DC power supplies (such
as microchipDIRECT AC002014 (http://www.microchip.com/AC002014)).
powered with an external wall cube, 5 V or 3.3 V rail currents up to ~1.3 A are
supported. However, when continuously operating at this current level, be
careful, as components U6, D20, U9, and other surrounding areas will become
quite hot (>100° Celsius possible).
Some of the components in the power supply related circuitry have special purposes
that may not be immediately obvious at first glance. Some of the special
components and details/intent of their implementation are described below.
The Explorer 16/32 components Q5, C61, and R132 implement a soft start circuit
when the board is powered through one of the USB connectors.
During attachment of a USB device to a host (or hub), a USB device should attempt
to limit the amount of (near) instantaneous in-rush current it consumes from the
host/hub's +5V VBUS supply. If the device's total VBUS effective capacitance
6 z 18
here
3.3 V / Vdd Rail
3.3 V up to 400 mA
3.3 V up to 1.3 A
When operating on USB power only, the total current (sum of 3.3 V + 5 V + 9 V
rail currents) that may be drawn by hardware accessories (ex: mikroBUS,
PICtail Plus, and PIM boards) should not exceed 400 mA. When an external
wall cube is connected to the DC barrel jack J12, the total current (sum of 3.3 V
+ 5 V + 9 V rail currents) available to accessory hardware is 1.3A, or the max
current rating of the wall cube, whichever is lower.
http://microchipdeveloper.com/boards:explorer1632
(https://microchip.box.com/shared/static
"5 V" Rail
~4.5 V up to 400 mA
5.0 V up to 1.3 A
"9 V" Rail
~4.2 V up to 400 mA
~8.7 V up to 1.3 A
When
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