ATM90E32AS-AU-R datasheet(24/84 Pages) ATMEL

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M90E32AS [Datasheet]

Atmel-46003B-SE-M90E32AS-Datasheet_02122015

3.8.3

DETECTION MODE (D MODE)

In Detection mode, the current detector is active. The current detector compares whether any phase current exceeds the

configured threshold using low-power comparators.

When the current of one phase or multiple phases exceeds the configured threshold, the M90E32AS asserts the IRQ0 pin

to high and hold it until power mode change. The IRQ0 state is cleared when entering or exiting Detection mode.

When the current of all three current channels exceed the configured threshold, the M90E32AS asserts the IRQ1 pin to

high and hold it until power mode change. The IRQ1 state is cleared when entering or exiting Detection mode.

The threshold registers need to be programmed in Normal mode before entering Detection mode.

The digital I/O state is the same as that in Idle state (except for IRQ0/IRQ1 and PM1/PM0).

The M90E32AS has two comparators for detecting each phase’s positive and negative current. Each comparator’s thresh-

old can be set individually. The two comparators are both active by default, which called ‘double-side detection’. User also

can enable one comparator only to save power consumption, which called ‘single-side detection’.

Double-side detection has faster response and can detect ‘half-wave’ current. But it consumes nearly twice as much power

as single-side detection.

Comparators can be power-down by configuring the DetectCtrl register. The current detector can be enabled and calibrated

in normal mode using control bits in the DetectCtrl register.

Figure-12 Block Diagram in Detection Mode

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

Disabled

ATM90E32AS-AU-R Datasheet(PDF) 24 Page - ATMEL Corporation

ATM90E32AS-AU-R Datasheet(HTML) 24 Page - ATMEL Corporation

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