Datasheet

R
SHUNT
Attenuator
Load
Two-Wire
Interface
GND
INA223
C
BYPASS
0.1 Fm
V (Supply Voltage)
S
Power Supply
(0V to 26V)
R
4.7k
PULLUP
W
V
IN-
V
IN+
V
OUT
SCL
SDA
A0
0 ResistorsW
Unpopulated C3
www.ti.com INA223EVM Hardware Overview
3.6.4 V
IN+
and V
IN–
Input Filter (R4, R3, and C3)
The INA223EVM has an optional input filter located between the terminal block T2 and the INA223 input
pins. This filter helps to remove high-frequency noise from the V
IN+
and V
IN–
inputs. The EVM ships with
this filter not used. C3 is typically unpopulated and R3 and R4 have 0-Ω resistors installed. If filtering is
desired, limit the value for R3 and R4 to 10-Ω or less. Figure 9 shows the typical setup that is
recommended for basic INA223 evaluation. See the INA223 data sheet (SBOS528) for more details.
Figure 9. Typical Filter Setup
3.6.5 Shunt Monitor Configuration and Terminal Block T2
The INA223 is typically used in a high-side configuration, as shown in Figure 10. The T2 terminal block
includes the connections for V
IN+
and V
IN–
, which should be connected directly across the shunt resistor.
Depending on the user’s needs, either of these configurations may be used without any changes needed
to the INA223EVM board or software.
Figure 10. INA223 Shunt Configurations
11
SBOU125–June 2012 INA223EVM User’s Guide and Software Tutorial
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