Microchip Technology MCP401XEV, Руководство пользователя

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Installation and Operation
©
2010 Microchip Technology Inc. DS51888A-page 13
2.3 GETTING STARTED
The MCP401XEV Evaluation Board allows quick evaluation of the
MCP40D18-103AE/LT device. This device is in the potentiometer configuration with
terminal B internally tied to ground. This devices has an R
AB
resistance that is typically
10 k
Ω
and has a slave I
2
C device address of 7Ch. Evaluation can be done by:
• Using the PICkit Serial Analyzer for interface communication
• Jumpering the MCP401XEV Evaluation Board into your application circuit to
control the MCP40D18-103A device
This user guide will discuss the steps needed to evaluate the MCP40D18-103AE/LT
device using the PICkit Serial Analyzer (order number: DV164122).
Section 2.5 “Configuring The PICkit Serial Analyzer” shows the steps to configure
the PICkit Serial Analyzer as well as create User Script files which are used to
communicate with the MCP40D18, based on the devices I
2
C communication protocol
format.
2.4 MCP401XEV EVALUATION BOARD DESCRIPTION
The MCP401XEV Evaluation Board uses the flexible SC70EV Evaluation Board PCB.
This simple Evaluation Board allows the system designer to quickly evaluate the
operation of the MCP40D18-103A device (R
AB(TYP)
= 10 k
Ω
and has a device slave
I
2
C address = 7Ch) using the PICkit Serial Analyzer or by jumpering the board into their
application system. The PICkit Serial Analyzer is available separately (order number:
DV164122).
2.4.1 The Hardware
Figure 2-2 shows the component layout of the MCP401XEV Evaluation Board. This is
a small four-layer board (1.43" x 1.255" (36.322 mm x 31.877 mm)). There are ten
connection points/pads that can use either through-hole or surface-mount connector
posts.
The pad labeled VDD is connected to the PCB power plane, while the pad labeled VSS
is connected to the PCB ground plane. All the passive components that are connected
to VDD or VSS are connected to either the power plane or ground plane.
The eight remaining PCB pads correspond to the device pins (i.e.; pad 1 connects to
pin 1).
Each pad has two passive components associated with them: a pull-up resistor and a
pull-down resistor. The pull-up resistor is always RXU and the pull-down resistor is
RXD. The “X” is a numeric value that corresponds to a particular pad (1 to 8). As an
example, Pad 5’s pull-up resistor is R5U. Capacitor C1 and C2 are the power supply
filtering capacitors. For whichever pin is the device’s VDD, the RxD component
footprint can be used for the device’s bypass capacitor. Table 2-2 describes the
components.
A 6-pin header interface is available to support the PICkit Serial or the PICmicro
In-Circuit Serial Programming (ICSP) interface.