INA700 datasheet(15/50 Pages) TI

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voltage is measured with respect to device ground. Monitored bus voltages can range from 0 V to 40 V, while

monitored temperatures can range from –40°C to +125°C.

Shunt voltage, bus voltage, and temperature measurements are multiplexed internally to a single ADC as shown

in Figure 7-5.

IN+

IN-

VBUS

MUX digital

Control

Bus Voltage

Shunt Voltage

Temperature

ADC_IN+

ADC_IN-

To ADC Input

Integrated

Shunt Resistor

TEMP

Temperature

Sensor

Figure 7-5. High-Voltage Input Multiplexer

7.3.4 Internal Measurement and Calculation Engine

The current and charge are calculated after temperature and shunt voltage measurements, while the power and

energy are calculated after a bus voltage measurement. Power and energy are calculated based on the previous

current calculation and the latest bus voltage measurement.

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

(see Figure 7-6). 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 their 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

they can then be read.

The energy and charge values are accumulated for each conversion cycle. Therefore the INA700 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 7-6. Power, Energy, and Charge Calculation Scheme

7.3.5 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

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INA700

SBOSAB4A – MAY 2023 – REVISED SEPTEMBER 2023

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