Microchip Technology MCP355X, Руководство пользователя

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MCP355X TINY APPLICATION SENSOR
DEMO BOARD USER’S GUIDE
©
2006 Microchip Technology Inc. DS51598A-page 7
Chapter 2. Installation and Operation
2.1 INTRODUCTION
The MCP355X Tiny Application Sensor Demo Board is designed to demonstrate the
performance of the MCP3550/1/3 devices in a simple low-cost application. The circuit
uses a ratiometric sensor configuration and uses the system power supply as the
voltage reference. The extreme common mode rejection capability of the MCP3551
device, along with it’s excellent normal mode power supply rejection at 50 and 60 Hz,
allows for this system performance. The functional circuit block diagram is shown in
Figure 2-1.
FIGURE 2-1: Ratiometric Sensor Configuration.
2.2 FEATURES
The MCP355X Tiny Application Sensor Demo Board has the following features:
• Better than 16-bit system performance from a direct connected PC USB
connection using ratiometric
• Simple USB connection to DataView on the PC showing system performance
• Low-cost design for analog-to-digital conversion
USB interface to DataView on PC
PC Running
for noise analysis
V
REF
PIC18F4550
V
DD
V
SS
SCK
SDO
CS
MCP3551
MCP355X Tiny Application Sensor Demo Board
350
Ω
350
Ω
350 Ω
350 Ω
USB
DataView
SM5420 Absolute
Pressure Sensor
PS Filtering
Analog
Digital
Inpu
t Fi
lter
ing
3
5
V
IN
+
V
IN
-