Microchip Technology MCP3421EV User Manual
Quick Start Instructions
© 2009 Microchip Technology Inc.
DS51793A-page 7
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.
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.
Serial Analyzer as shown in Figure 1-2.
2.
Connect the oscilloscope probes to SCL and SDA test pins (optional).
3.
V
DD
selection: You can use the V
DD
from the PICkit Serial Analyzer or use your
own external V
DD
. You can select the V
DD
path using the JP1 connector:
(a) Connect JP1, if using V
DD
from PICkit Serial Analyzer,
(b) Disconnect JP1 and apply V
DD
at V
DD
pin, if you are using external V
DD
.
4.
Connect V
DD
, if external V
DD
is used.
5.
LED D1 turns on when V
DD
is applied.
6.
Connecting analog inputs: If you need to measure single-ended input, connect
the unused pin (example, V
the unused pin (example, V
IN
-) to V
SS
.
7.
Use the PICkit Serial Analyzer PC GUI to send I
2
C write and read commands.
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.
results. The conversion results appear on the PICkit Serial Analyzer PC GUI. You
can also observe the conversion results using the oscilloscope.
Note:
If you are using external V
DD
, connect the external V
DD
at V
DD
pad).
Note:
Do not connect V
DD
if you are using V
DD
from the PICkit Serial Analyzer.
The PICkit Serial Analyzer provides the V
DD
automatically if it is connected
to PC.
Note:
If the V
DD
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 I
a Script File for Configuration Byte Writing” for executing the I
2
C
command.
CAUTION
The analog input pin has ESD diodes. Certain input conditions can damage the
device. Please pay attention to the following conditions:
device. Please pay attention to the following conditions:
(a) Do not apply input greater than the input range specified by the MCP3421
data sheet.
data sheet.
(b) Apply input signal after V
DD
is powered-up.