AMC131M01DFMR datasheet(68/81 Pages) TI

68 / 81 page

9.2.1 Design Requirements

Table 9-2 lists the design requirements for a three-phase metrology application.

Table 9-2. Key System Specifications

FEATURES

DESCRIPTION

Number of phases

3 phase (requires measurement of three voltages and three currents)

E-meter accuracy class

Class 0.1

Current sensor

Shunt resistor

Current range

0.05 A–100 A

System nominal frequency

50 Hz or 60 Hz

Measured parameters

•

Active, reactive, apparent power, and energy

•

Root-mean-square (RMS) current and voltage

•

Power factor

•

Line frequency

9.2.2 Detailed Design Procedure

Figure 9-5 illustrates phase A of a three-phase energy meter. The other AMC131M01 devices that monitor

phases B and C are connected in a similar way. The phase A current, ISHUNT, is sensed with a shunt resistor

(RSHUNT) using channel 0 of the ADC (AIN0N, AIN0P). One terminal of the shunt becomes the isolated

ground ISO_GND of the circuit and is connected to the ground pin HGND (pin 5) of the isolated side of the

AMC131M01.

The selection of the shunt resistor value is made based on the manufacturer and current range required for

energy measurements.

The measurement of the mains voltage is not shown in Figure 9-5. This voltage measurement is typically

implemented by sensing each individual phase voltage with a resistor divider connected to a non-isolated

multichannel ADC. This multichannel ADC can be implemented as a discrete component, or using the onboard

ADC of the MCU if available.

In this design, the AMC131M01 interacts with an MCU in the following manner:

• The MCU provides the CLKIN clock to the AMC131M01

• When new ADC conversion data are ready, the AMC131M01 asserts the DRDY pin, which alerts the MCU

that new samples are available

• After being alerted of new conversion data, the MCU retrieves the current samples from the AMC131M01

through the SPI interface

AMC131M01

SBASA57 – SEPTEMBER 2023

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