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Installation and Operation
2.4.1.3
DEMO STEPS
The Explorer 16 Development Board firmware contains two programs. The program
selected is determined after a reset (including the Power-on reset) by the state of the
S3 switch. The programs are:
1. Wiper 1 Saw Wave (Switch S3 not depressed).
2. Increment / Decrement with High Voltage Write to Non-Volatile Wiper 1 Register
(Switch S3 depressed).
Table 2-2 shows the sequence of steps to demonstrate the MCP46XXDM-PTPLS
board with the Explorer 16 Development Board.
Figure 2-6 shows the expected output waveform for Program #1 (Wiper 1 Saw Wave)
as well as the voltage levels and ranges of the four signals. Figure 2-7 shows an
example waveforms for the High Voltage Write Command for the SDA, SCL, and HVC
signals.
TABLE 2-2:
DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO
BOARD
Step
1a
1b
2a
2b
3
4
5
6
7
Action
Turn on the oscilloscope and configure it as
follows:
? Channel 1, 2, 3, and 4 @ 5V/Division
? Channel 1 to 4 have the same ground
reference point
Configure the oscilloscope as follows:
? Time-base = 10 ms/Division
(see Figure 2-6 for scope details)
Configure the MCP46XXDM-PTPLS to the
jumper settings shown in Figure 2-4 .
On the Explorer 16 Development Board,
remove the shunt on JP2 (near the indicator
LEDs).
Insert the MCP46XXDM-PTPLS board into the
Explorer 16 Development Board J5 header
(see Figure 2-5 ). Ensure proper orientation of
Daughter Board to J5 Header.
Connect the oscilloscope probes as follows:
? Channel 1 to the CS Pin of Header J1
(HVC signal of MCP4661)
? Channel 2 to the SDA Pin of Header J2
? Channel 3 to the SCL Pin of Header J2
? Channel 4 to the VW1 Pad
Power up the programmed Explorer 16
Development Board and depress and release
the MCLR push button.
Depress the Explorer 16 Development Board’s
S3 push button.
Depress and release the Explorer 16
Development Board’s MCLR push button.
Result
—
—
—
The LEDs are disabled (no longer
connected to ground).
—
—
Program 1 is now selected.
Output waveform should look similar
to Figure 2-6 . Ensure to verify
voltage levels/ranges of the four
signals.
(Note 1)
—
—
Note 1:
? 2009 Microchip Technology Inc.
The SDA and SCL signals go from V SS to approximately 3.3V due to the PIC24
operating at 3.3V. The VW1 signals go from V SS to approximately 5V.
DS51804A-page 17
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