ADS131M08IPBSR datasheet(91/118 Pages) TI2

91 / 118 page

9.1.4 Power Metrology Applications

Each channel of the ADS131M08 is identical, giving designers the flexibility to sense voltage or current with any

channel. Simultaneous sampling allows the application to calculate instantaneous power for any simultaneous

voltage and current measurement. This section provides a diagram depicting the common energy metrology

configuration that can be used with the ADS131M08. A Rogowski coil can alternatively be used to sense current

in the following example wherever a CT is used. The integration to determine the current flowing through the

Rogowski coil is done digitally if that modification is made. RC antialiasing filters are not shown in the following

diagrams for simplicity, but are recommended for all channels.

Figure 9-3 illustrates a three-phase configuration where live and neutral currents are monitored using CTs, the

phase voltages are measured using a voltage divider, and the final channel is used for an auxiliary

measurement. This auxiliary measurement can be temperature if connected to an external thermistor or other

voltage output temperature sensor. Otherwise, this measurement can sense any other signal that requires

monitoring on the board.

AIN0N

AIN1P

AIN1N

AIN0P

AVDD

AGND

ADS131M08

VDD

AIN2N

AIN3P

AIN3N

AIN2P

Load

AIN4N

AIN4P

AIN5P

AIN5N

AIN6N

AIN6P

AIN7P

AIN7N

Aux

Figure 9-3. Three-Phase Current and Voltage Measurement Front-End With a Neutral Current Monitor

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ADS131M08

SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021

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ADS131M08IPBSR Datenblatt(PDF) 91 Page - Texas Instruments