INA260EVM-PDK Hardware
11
SBOU180 – November 2016
Copyright © 2016, Texas Instruments Incorporated
INA260EVM-PDK and Software Tutorial
2.2.2
EVM Analog Inputs
The INA260 accepts two kinds of analog inputs: namely, a current through the internal shunt resistor and
a voltage between the V
BUS
pin and GND. The GUI allows the INA260 to be configured for digitizing either
one or both of these inputs in serial order. The high current lug connectors designated T1 and T2 are the
terminations of the internal 2-m
Ω
shunt resistor. Therefore, connect T1 and T2 in series with the input
current source and load; see
. The INA260 is a bidirectional device and thus current can flow
through the shunt resistor in either direction.
CAUTION
Do Not Exceed the Absolute Maximum Ratings (see the
)!
To help ensure safe operating conditions, the following electrical ratings must
not be exceeded:
•
15 A between connectors T1 and T2 in either direction
•
36 Vdc between T1 and GND
•
36 Vdc between T2 and GND
WARNING
Potential Burn Hazard!
To minimize risk of burn, do not touch U1 (the INA260 device)
when input current is present. Temperatures higher than 50°C are
possible.
The V
BUS
input of the INA260 is accessible through pin 2 of header J1. Pins 1 and 3 of J1 are connected
to IN+ and IN–, respectively. Note that the V
BUS
input is independent of the current input (that is, the V
BUS
input can be applied with or without a load), and the INA260 provides an accurate voltage reading.
However, the device also passively multiplies the measured values of V
BUS
and input current to generate a
power value. For the power calculation to be meaningful, V
BUS
must represent the voltage drop created by
the input current across the load. Therefore, for accurate load power measurements, short the V
BUS
pin to
IN+ or IN– (on header J1) depending on the location of the load. For example, for the arrangement in
, short V
BUS
to IN– for an accurate load power calculation.
The EVM PCB also includes placeholders for the TVS devices to protect the INA260 inputs from
excessively high common-mode voltages. The pads for these uninstalled devices, D3 and D4, are located
on the bottom side of the EVM PCB and are suitable for DO-214AB package.
