ATM90E32AS-AU-R datasheet(28/84 Pages) ATMEL

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M90E32AS [Datasheet]

Atmel-46003B-SE-M90E32AS-Datasheet_02122015

3.9.1

GAIN BASED COMPENSATION

The channel gain can be tuned automatically according to measured temperature and current RMS.

Here

Log(x) = Log2(x)*16, e.g.: Log(2) = 16, Log(16) = 64

•

Gain0 is the calibrated Gain at nominal condition,

•

GainIrms is the gain adjustment per Irms change (8 bit)

•

Irms_ref is the reference current RMS

•

GainIrms_offset is the offset for segment calibration

•

UGain0 is the calibrated Gain at nominal temperature

•

UGainT is the gain adjustment per temperature degree change,

•

T0 is the nominal temperature,

If (Irms > Irms0)

GainIrms = GainIrms0,

Irms_ref = Irms0,

GainIrms_offset = 0,

If (Irms1<Irms < Irms0)

GainIrms = GainIrms1,

Irms_ref = Irms0,

GainIrms_offset = 0,

If (Irms < Irms1)

GainIrms = GainIrms2,

Irms_ref = Irms1

Figure-15 Segment Gain Compensation













ffset

GainIrms_o

))

Irms_ref

Irms

(Log(

GainIrms

Gain0

Channel_Ga

















T0)

UGainT

UGain0

in_Voltage

Channel_Ga

))

Irms0

Irms1

(Log(

GainIrms1

ffset

GainIrms_o

PhiIrms0

PhiIrms1

PhiIrms2

Irms0

Irms1

Log(Irms)

Delta-Gain

Delta-Phi

Delta-Gain

Delta-Phi

GainIrms0

GainIrms1

GainIrms2

ATM90E32AS-AU-R Datasheet(PDF) 28 Page - ATMEL Corporation

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