MCP3221DM-PCTL Microchip Technology, MCP3221DM-PCTL Datasheet - Page 12

• Manufacturer Part Number: MCP3221DM-PCTL
• Description: BOARD DEMO FOR PICTAIL MCP3221
• Manufacturer: Microchip Technology
• Series: PICtail™r
• Type: A/Dr

Specifications of MCP3221DM-PCTL

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 22.3k
• Data Interface: Serial
• Inputs Per Adc: 1 Single Ended
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: MCP3221
• Product: Data Conversion Development Tools
• Resolution: 12 bit
• Interface Type: USB
• Silicon Manufacturer: Microchip
• Silicon Core Number: MCP3221
• Kit Application Type: Data Converter
• Application Sub Type: ADC
• Silicon Family Name: PICtail
• Kit Contents: Board Cables CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: MCP3221
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

2.4
DS51545B-page 8
MCP3221 PICTAIL™ DEMO BOARD DESCRIPTION
The major components of the MCP3221 PICtail™ Demo Board are listed.
1. MCP3221 device (U1)
2. PICmicro
3. PICkit™ Starter Kit Header (J1)
4. USB Connector (J2)
5. Analog Input and Prototype Area (TP)
6. Input Selection Jumper (JP1)
7. Potentiometer Input (VR1)
For more detailed circuit information, refer to Appendix A. “Schematic and Layouts”
and Appendix B. “Bill Of Materials (BOM)”.
FIGURE 2-1:
2.4.1
The USB power is regulated and filtered before supplying power to the MCP3221
device. The raw USB power supplies the digital voltage to the PICmicro MCU only. This
digital power supply is filtered through the LRC circuit and the 4.1V regulator as it
becomes the analog voltage (A
used as the reference for the mechanical potentiometer. This regulated ratiometric
connection achieves superior performance from the typically noisy PC USB power
supply.
2.4.2
The MCP3221 is an infrared device. The two data lines, SCL and SDA, are connected
from the PICkit Starter Kit header J1 to the appropriate port pins, RC0 and RC1. +5V
and V
header.
2.4.3
The MCP3221 analog input is tied directly to TP1, next to a small area for prototyping.
A mechanical potentiometer is also connected to this node, allowing for a quick DC
evaluation of the device’s function. When the jumper is selected, the wiper of the
mechanical potentiometer is connected to the analog input of the device. When the
jumper is de-selected, the analog input is connected only to TP1 and the prototype
area.
SS
are the other two PICkit Starter Kit connections made on the MCP3221 PICkit
Hardware Power
MCP3221 Interface to PICkit™ 1 Flash Starter Kit
Selecting The Analog Input
®
MCU – PIC16C745 (U2)
MCP3221 PICtail™ Demo Board Block Diagram.
VDD
) for the MCP3221. This analog power supply is also
© 2006 Microchip Technology Inc.