ATM90E32AS-AU-R datasheet(2/84 Pages) ATMEL

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M90E32AS [Datasheet]

Atmel-46003B-SE-M90E32AS-Datasheet_02122015

APPLICATION

• Poly-phase energy meters of class 0.2S, 0.5S and class 1 which are used in three-phase four-wire (3P4W, Y0) or

three-phase three-wire (3P3W, Y or Δ) systems.

• Power monitoring instruments which need to measure voltage, current, mean power, etc.

GENERAL DESCRIPTION

The M90E32AS is a poly-phase high performance wide-dynamic range metering IC. The M90E32AS incorporates 6 inde-

pendent 2nd order sigma-delta ADCs, which could be employed in three voltage channels (phase A, B and C) and three

current channels (phase A, B, C) in a typical three-phase four-wire system.

The M90E32AS has an embedded DSP which executes calculation of active energy, reactive energy, apparent energy, fun-

damental and harmonic active energy over ADC signal and on-chip reference voltage. The DSP also calculates measure-

ment parameters such as voltage and current RMS value as well as mean active/reactive/apparent power.

A four-wire SPI interface is provided between the M90E32AS and the external microcontroller.

The M90E32AS is suitable for poly-phase multi-function meters which could measure active/reactive/apparent energy and

fundamental/harmonic energy either through four independent energy pulse outputs CF1/CF2/CF3/CF4 or through the cor-

responding registers.

The ADC and auto-temperature compensation technology for reference voltage ensure the M90E32AS's long-term stability

over variations in grid and ambient environment conditions.

BLOCK DIAGRAM

Figure-1 M90E32AS Block Diagram

VDD18 Regulator

Temperature Sensor

Current Detector

ADC-V1

ADC-V2

ADC-V3

ADC-I1

ADC-I2

ADC-I3

SPI Interface

DSP

Energy Metering

(Forward/Reverse

Active/Reactive/CF Generator)

Measure and Monitoring

(V/I/rms / SAG / Phase /

Frequency)

Control Logic

Zero

Crossing

CF Out

Power On Reset

Crystal Oscillator

On-chip

Reference Voltage

Vref

I1P / I1N

V1P / V1N

SCLK

SDO

SDI

OSCI

OSCO

RESET

CF1

ZX0

I2P / I2N

I3P / I3N

V2P / V2N

V3P / V3N

CF2

CF3

CF4

ZX1

ZX2

Power Mode

Configuration

PM1

PM0

IRQ

WarnOut

IRQ0

IRQ1

Warn

Out

Flexible Piece-wise Non-linear

Compensation

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