ATM90E32AS-AU-R datasheet(19/84 Pages) ATMEL

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M90E32AS [DATASHEET]

Atmel-46003B-SE-M90E32AS-Datasheet_02122015

3.7.2

INSTANTANEOUS SIGNAL RELATED STATUS AND EVENTS

The registers involved are OVth, OIth, SagTh, PhaseLossTh and SagPeakDetCfg.

The result can be reflected in EMMState0 and EMMState1 registers, as well as EMMIntState0 and EMMIntState1 registers

if the corresponding bits in EMMIntEn0/EMMIntEn1 registers are set.

The threshold value has the following relationship with the RMS register (MSB-16bit):

Here VIgain is Ugain register value or Igain register value.

3.7.2.1

Sag Detection

Usually in the application the Sag threshold is set to be 78% of the reference voltage. The M90E32AS generates Sag event

when there are less than three 8KHz samples (absolute value) greater than the sag threshold in one detecting period.

Refer to 6.6 Voltage Sag and Phase Loss Timing. The detecting period length can be configured by the Sag_Period bits

(b7~0, SagPeakDetCfg).

Sag status is asserted when there is no voltage instantaneous sample's absolute value goes beyond the Sag threshold in

any phase. Sag status is cleared when there are three samples detected with absolute value above the Sag threshold.

For the computation of Sag threshold register value, refer to application note 46103.

The Sag event is captured by the SagPhaseIntST bits (b14-12, EMMIntState1). If the corresponding IRQ enable bits the

SagPhaseIntEN bits (b14-12, EMMIntEn1) is set, IRQ can be generated. Refer to Figure-26.

3.7.2.2

Phase Loss Detection

The phase loss detection detects if there is one or more phases’ voltage is less than the phase-loss threshold voltage.

The processing and handling is similar to sag detection, only the threshold is different. The threshold computation flow is

also similar. The typical threshold setting could be 10% Un or less.

If any phase line is detected as in phase-loss mode, that phase’s zero-crossing detection function (both voltage and cur-

rent) is disabled.

3.7.2.3

Over Voltage (OV) Detection

When any phase's absolute voltage sample instantaneous value goes beyond the over voltage threshold, the Over Voltage

status is asserted. The status is de-asserted when the voltage sample instantaneous value go back below the over voltage

threshold.

Change of the Over Voltage status can generate interrupt and flagged in the EMMState0 and EMMIntState0 registers.

3.7.2.4

Over Current (OI) Detection

When any phase's absolute current sample instantaneous value go beyond the over current threshold, the Over Current

status is asserted. The status is de-asserted when the current sample instantaneous value go back below the over current

threshold.

Change of the Over Current status can generate interrupt and flagged in the EMMState0 and EMMIntState0 registers.

VIgain

RmsRegValu

xxThRegVal

∗

ATM90E32AS-AU-R Datasheet(PDF) 19 Page - ATMEL Corporation

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