Texas Instruments INA220EVM, User Manual, Page: 7 / 26

USB DIG EVM
External
Power
USB Connection
from Computer
V
5V
USB
Adjustable
Regulator
Power
Switching
3.3V
Regulator
Buffers and
Latches
TUSB3210
8052 C
with USB Interface
and UART
m
Reset Button
and Power-On
Reset
8Kx8-Byte
EEPROM
V
(2.7V to
5.5V)
CC
V
(2.7V to 5.5V)
DUT
Switched Power
I C
SPI
Control Bits
Measure Bits
2
V
3.3V
S
m
C
www.ti.com
System Setup
7 SBOU079B – July 2009 – Revised May 2016
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Copyright © 2009–2016, Texas Instruments Incorporated
INA220 Evaluation Module
2.3 Theory of Operation For USB_DIG_Platform
Figure 5 shows the block diagram for the USB DIG Platform. This platform is a general-purpose data
acquisition system that is used on several different Texas Instruments evaluation modules. The details of
its operation are included in
a separate document (available for download at www.ti.com). The block
diagram shown in Figure 5 gives a brief overview of the platform. The primary control device on the USB
DIG Platform is the TUSB3210 .
Figure 5. USB_DIG_Platform Theory of Operation
An important function of the USB DIG is to power the EVM PCB. As depicted in Figure 5 , switched power
for the EVM can be derived from the PC's USB supply or alternatively from an external power source
connected to J5. TI recommends using the external supply option because the USB power supply can be
noisy. The barrel connector cable assembly included in the EVM kit can be used to connect an external
power supply to the USB DIG. Connect the black wire of the cable assembly to the low side (or ground) of
the external supply and the red wire to the high side.
NOTE: For proper operation, the external source must provide a supply voltage between 5.8 V and
10.4 V and have a current limit greater than 100 mA