Microchip Technology MCP42XXDM-PTPLS Data Sheet

MCP42XX PICtail™ Plus Daughter Board User’s Guide

DS51759A-page 6

1.2

WHAT IS THE MCP42XX PICTAIL PLUS DAUGHTER BOARD?

The MCP42XX PICtail Plus Daughter Board is used to demonstrate the use of Digital
Potentiometers. This board is designed to be used in conjunction with either the PIC24
Explorer 16 Demo Board or the PICkit™ Serial Analyzer. Figure 1-1 shows the boards
component placement and the purpose of the jumpers.

The board has an MCP4261-103 (10 k

Ω) device for evaluation. This device is in the

TSSOP package (U2). This is a dual 8-bit Non-Volatile Potentiometer device. The
MCP4261 uses an SPI interface and can be controlled via the PICkit Serial Analyzer
interface (J1) or via the PICtail Plus interface (J3).

When using the PICtail Plus interface, the CS voltages can be taken to a V

IHH

level for

high voltage commands. This is done by controlling the selection of the analog switch
device (U1).

Jumpers allow the Terminal A and Terminal B voltages to be tied to AVDD and VSS, or
come from and external source.

FIGURE 1-1:

MCP42XX Explorer 16 Daughter Board Demo Board Connectors.

PICkit Serial
Analyzer
Interface (SPI)

Not Installed

Connects
Wipers
(W0 and W1)
to PIC24 Analog
Inputs

Connects
Explorer 16
+5V signal to
AVDD signal

Selects source
of Terminal A0
Voltage. Either
AVDD or VA0

Selects source
of Terminal B0
Voltage. Either
AVSS or VB0

Selects source
of Terminal A1
Voltage. Either
AVDD or VA1

Selects source
of Terminal B1
Voltage. Either
AVSS or VB1