90E21 Datasheet, PDF (29/57 Pages) Integrated Device Technology – Single-Phase High-Performance Wide-Span Energy Metering IC

90E21/22/23/24
SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
MMode
Metering Mode Configuration
Address: 2BH
Type: Read/Write
Default Value: 9422H
15
14
13
12
Lgain2
7
Lgain1
6
Lgain0
5
Ngain1
4
Amod
Rmod
ZXCon1
ZXCon0
Bit
Name
L line current gain, default value is ‘100’.
11
10
Ngain0
3
LNSel
2
Pthresh3
Pthresh2
Description
9
DisHPF1
1
Pthresh1
8
DisHPF0
0
Pthresh0
15 - 13
12 - 11
10
Lgain[2:0]
Ngain[1:0]
LNSel
Lgain2
1
0
0
0
0
Lgain1
X
0
0
1
1
Lgain0
X
0
1
0
1
Current Channel Gain
1
4
8
16
24
N line current gain
00: 2
01: 4
10: 1 (default)
11: 1
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)
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:
9-8
DisHPF[1:0]
DisHPF1
0
0
1
1
DisHPF 0
0
1
0
1
HPF Configuration
enable HPF1 and HPF0 (default)
enable HPF1, disable HPF0;
disable HPF1, enable HPF0;
disable HPF1 and HPF0
CF1 output for active power:
7
Amod 0: forward or reverse energy pulse output (default)
1: absolute energy pulse output
CF2 output for reactive power:
6
Rmod 0: forward (inductive) or reverse (capacitive) energy pulse output (default)
1: absolute energy pulse output
Register
29
January 10, 2012