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System Setup
2
System Setup
Figure 2
shows the system setup for the INA220EVM. The PC runs software that communicates with the
USB DIG Platform. The USB DIG Platform generates the analog and digital signals used to communicate
with the INA220_Test_Board. Connectors on the INA220_Test_Board allow the user to connect to the
system under test whose power, current, and voltage will be monitored.
2.1
Theory of Operation for INA220_Test_Board Hardware
Figure 3
presents a block diagram of the INA220_Test_Board. The functionality of this PCB is relatively
simple. It provides connections to the I
DIG Platform board. It also provides connection points for external connections of the shunt voltage, bus
voltage, and GND.
4
INA220 Evaluation Module
EVM
Power
Figure 2. INA220EVM Hardware Setup
2
C interface and general-purpose input/outputs (GPIO) on the USB
V
DUT
Switched 5.0V Power
25-Pin
Male DSUB Signals
From USB DIG Platform
Interface
Figure 3. INA220_Test_Board Block Diagram
Copyright © 2009–2010, Texas Instruments Incorporated
System on which we will measure
Shunt Current, Bus Voltage, and Power
Shunt
Resistor
System
Power
INA220
Test Board
USB DIG
Platform
Connection to
Supply
Shunt Voltage
and GND
Address
2
I C
Jumpers
INA220
SBOU079A – July 2009 – Revised February 2010
www.ti.com
System
Load
2
I C
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