90E21 datasheet(29/57 Pages) IDT

29 / 57 page

90E21/22/23/24

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC

January 10, 2012

MMode

Metering Mode Configuration

Address: 2BH

Type: Read/Write

Default Value: 9422H

Bit

Name

Description

15 - 13

Lgain[2:0]

L line current gain, default value is ‘100’.

12 - 11

Ngain[1:0]

N line current gain

00: 2

01: 4

10: 1 (default)

11: 1

LNSel

This bit specifies metering as L line or N line when metering mode is set to flexible mode by MMD1 and MMD0 pins.

0: N line

1: L line (default)

9 - 8

DisHPF[1:0]

These bits configure the High Filter Pass (HPF) after ADC. There are two first-order HPF in serial: HPF1 and HPF0. The config-

uration are applicable to all channels:

7Amod

CF1 output for active power:

0: forward or reverse energy pulse output (default)

1: absolute energy pulse output

6Rmod

CF2 output for reactive power:

0: forward (inductive) or reverse (capacitive) energy pulse output (default)

1: absolute energy pulse output

Lgain2

Lgain1

Lgain0

Ngain1

Ngain0

LNSel

DisHPF1

DisHPF0

765

432

Amod

Rmod

ZXCon1

ZXCon0

Pthresh3

Pthresh2

Pthresh1

Pthresh0

Lgain2

Lgain1

Lgain0

Current Channel Gain

DisHPF1

DisHPF 0

HPF Configuration

enable HPF1 and HPF0 (default)

enable HPF1, disable HPF0;

disable HPF1, enable HPF0;

disable HPF1 and HPF0

90E21 Datasheet(PDF) 29 Page - Integrated Device Technology

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