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