DM183032 Microchip Technology, DM183032 Datasheet - Page 18

• Manufacturer Part Number: DM183032
• Description: BOARD EXPLORER PICDEM PIC18
• Manufacturer: Microchip Technology
• Series: MPLAB®r
• Type: MCUr

Specifications of DM183032

• Contents: Evaluation Board
• Processor To Be Evaluated: PIC 18
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F8xxx, PIC18FxxJxx
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC18 Series
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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