INA780A datasheet(24/51 Pages) TI1

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7 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

7.1.1 Device Measurement Range and Resolution

The INA780x has a full scale ADC range for current measurements of ±78.64 A. However, the maximum value

that can be measured is limited by the operating junction temperature (see Figure 7-1).

Junction Temperature ( C)

-50

-25

100

125

150

175

Figure 7-1. Maximum ADC Current Reading vs Junction Temperature (Typical Characteristic)

Table 7-1 shows the full scale value for shunt, bus, and temperature measurements, along with their associated

step size.

Table 7-1. Register Full Scale Values and Resolution

PARAMETER

ADDRESS

SIZE

FULL SCALE VALUE

RESOLUTION

Current

16 bit, signed

±78.641

2.4 mA/LSB

Bus voltage

16 bit, signed, always positive

0 V to 85 V

3.125 mV/LSB

Die Temperature

12 bit, signed

–40°C to +150°C

125 m°C/LSB

Power

24 bit, unsigned

8.05306 kW

480 µW/LSB

Energy

40 bit, unsigned

8444.25 MJ

7.68 mJ/LSB

Charge

40 bit, unsigned

164.927 MC

150 µC/LSB

The internal die temperature sensor register range extends from –256°C to +256°C but is limited by the junction

temperature range of –40°C to 150°C. Likewise, the bus voltage measurement range extends up to 102.4 V but

is limited by silicon to 85 V.

Current, bus voltage, temperature, power, energy and charge measurements can be read through their

corresponding address registers. Values are calculated by multiplying the returned value by the corresponding

LSB size.

Signed values are represented in 2's complement format.

INA780A, INA780B

SBOSAB6A – JULY 2023 – REVISED DECEMBER 2023

www.ti.com

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