MCP3421EV 查看數據表（PDF） - Microchip Technology
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MCP3421EV Datasheet PDF : 34 Pages
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Quick Start Instructions
1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER
Figure 1-1 shows the MCP3421 SOT23-6 Evaluation Board and Figure 1-2 shows the
Evaluation Board and PICkit Serial Analyzer connection.
The following steps describe how to use them together:
1. Connect the MCP3421 SOT23-6 Evaluation Board’s J1 pin socket to the PICkit
Serial Analyzer as shown in Figure 1-2.
2. Connect the oscilloscope probes to SCL and SDA test pins (optional).
3. VDD selection: You can use the VDD from the PICkit Serial Analyzer or use your
own external VDD. You can select the VDD path using the JP1 connector:
(a) Connect JP1, if using VDD from PICkit Serial Analyzer,
(b) Disconnect JP1 and apply VDD at VDD pin, if you are using external VDD.
Note: If you are using external VDD, connect the external VDD at VDD pad).
4. Connect VDD, if external VDD is used.
Note: Do not connect VDD if you are using VDD from the PICkit Serial Analyzer.
The PICkit Serial Analyzer provides the VDD automatically if it is connected
to PC.
5. LED D1 turns on when VDD is applied.
Note:
If the VDD is provided from the PICkit Serial Analyzer, then the LED may not
be turned on until you execute a command. See Section 1.3.2.1 “Creating
a Script File for Configuration Byte Writing” for executing the I2C
command.
6. Connecting analog inputs: If you need to measure single-ended input, connect
the unused pin (example, VIN-) to VSS.
7. Use the PICkit Serial Analyzer PC GUI to send I2C write and read commands.
See Section 1.3.2.1 “Creating a Script File for Configuration Byte Writing”.
8. Execute the PICkit Serial Analyzer Script file and obtain the ADC conversion
results. The conversion results appear on the PICkit Serial Analyzer PC GUI. You
can also observe the conversion results using the oscilloscope.
CAUTION
The analog input pin has ESD diodes. Certain input conditions can damage the
device. Please pay attention to the following conditions:
(a) Do not apply input greater than the input range specified by the MCP3421
data sheet.
(b) Apply input signal after VDD is powered-up.
© 2009 Microchip Technology Inc.
DS51793A-page 7
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