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PICDEM? PIC18 Explorer Demonstration Board User’s Guide
2.3.2
Varying the Device Voltage (5V/3.3V)
By default, the PICDEM PIC18 Explorer Demonstration Board’s V DD supply is 5V. The
V DD can be varied, for PIM-mounted microcontrollers, from 5 to 3.3V to accommodate
devices running at 5 or 3.3V. This V DD is named VAR.
The PICDEM PIC18 Explorer Demonstration Board enables the voltage change with
PIM connection headers and a variable voltage regulator. PIMs mounted with 3.3V
devices implement the voltage change through two resistors with values that produce
the desired voltage. (See “Calculating Other V DD Values” on page 15 .)
The voltage varying hardware includes:
? An adjustable voltage regulator, the LM317 – Located on the board, left of the PIM
connectors and marked as U2 (recognizable by the TO-220 package commonly
used for transistors)
? Header J2 – Located above the PIM connectors
? Resistors R25 and R26 – Located below jumper J13
? Resistors R101 and R102 – Located on the PIM board
In setting the board’s voltage:
? For the default, 5V voltage –
- For board-mounted PIC18F8722 device:
? Board resistor R25 = 1 k Ω
? Board resistor R26 = 330 Ω
- For a PIM-mounted, 5V microcontroller:
? Board resistors R25 and R26 – Same values of 1 k Ω and 330 Ω ,
respectively
? PIM-mounted resistors R101 and R102 – Unpopulated
? For 3.3V V DD (achieved only with a PIM with a mounted 3.3V device, such as the
PIC18F87J11) –
- Header J2 goes into the PIM board where resistors R101 and R102 are
inserted in parallel to the board resistors R25 and R26
- PIM board resistor R101 can be unpopulated
- PIM board resistor R102 can be 1.18 k Ω .
DS51721B-page 14
Note:
For precise adjustment of V DD , 1% resistors are recommended.
? 2008 Microchip Technology Inc.
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