Microchip Technology MCP42XX, Руководство пользователя

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MCP42XX PICtail™ Plus Daughter Board User’s Guide
DS51759A-page 6
©
2008 Microchip Technology Inc.
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