INA701 datasheet(16/47 Pages) TI2

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The current, voltage, and temperature values are immediate results when the number of averages is set to one

(see Figure 6-7). However, when averaging is used, each ADC measurement is an intermediate result that is

stored in the corresponding averaging registers. Following every ADC sample, the newly-calculated values for

current, voltage, and temperature are appended to the corresponding averaging registers until the set number

of averages is achieved. After all of the samples have been measured, the average current and voltage is

determined, then the power is calculated and the results are loaded to the corresponding output registers where

the results can then be read.

The energy and charge values are accumulated for each conversion cycle. Therefore the INA701 averaging

function is not applied to these.

Calculations for power, charge and energy are performed in the background and do not add to the overall

conversion time.

Q1 =

i1 x t1

Q.. =

i.. x t..

Q.. =

i.. x t..

Q.. =

i.. x t..

Q.. =

i.. x t..

E.. =

p.. x t..

E.. =

p.. x t..

E.. =

p.. x t..

E.. =

p.. x t..

E1 =

p1 x t2

Power register

Energy register

Charge register

ADC,

Temperature, Current,

Voltage

Figure 6-7. Power, Energy, and Charge Calculation Scheme

6.3.5 High-Precision Delta-Sigma ADC

The integrated ADC is a high-performance, low-offset, low-drift, delta-sigma ADC designed to support

bidirectional current flow. The measured inputs are selected through the high-voltage input multiplexer to

the ADC inputs as shown in Figure 6-6. The ADC architecture enables lower drift measurement across

temperature and consistent offset measurements across the common-mode voltage, temperature, and power

supply variations. A low-offset ADC is preferred in current sensing applications to provide a near 0V offset

voltage that maximizes the useful dynamic range of the system.

The INA701 measures the die temperature, current, and bus voltage. An internal temperature measurement is

made before each current measurement. Temperature compensation is then applied to the current measurement

to achieve low drift performance. The MODE bits in the ADC_CONFIG register permit selecting modes to

convert only the current or bus voltage to allow the user to configure the monitoring function to fit the specific

application requirements. After an ADC conversion is complete, the converted values independently update in

the corresponding registers where the values can be read through the digital interface at the time of conversion

end if no averaging is selected. The conversion time for shunt voltage, bus voltage, and temperature inputs are

set independently from 50µs to 4.12ms depending on the values programmed in the ADC_CONFIG register.

The value for current is calculated after both the temperature and shunt voltage measurements are made. The

total time to get the current measurement is the sum of the conversion times for these two parameters. Enabled

measurement inputs are converted sequentially, which means the total time to convert all inputs depends on

the conversion time for each input and the number of inputs enabled. When averaging is used, the intermediate

values are subsequently stored in an averaging accumulator, and the conversion sequence repeats until the

number of averages is reached. After all of the averaging is complete, the final values are updated in the

corresponding registers that can then be read. These values remain in the data output registers until the values

are replaced by the next fully completed conversion results. In this case, reading the data output registers does

not affect a conversion in progress.

The ADC has two conversion modes—continuous and triggered—set by the MODE bits in the ADC_CONFIG

the output registers as described above in an indefinite loop. In triggered-conversion mode, the ADC converts

INA701

SBOSAM2 – AUGUST 2025

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