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90E21 Datasheet(PDF) 30 Page - Integrated Device Technology

Part # 90E21
Description  Single-Phase High-Performance Wide-Span Energy Metering IC
PDF  57 Pages
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

90E21 Datasheet(HTML) 30 Page - Integrated Device Technology

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90E21/22/23/24
SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Register
30
January 10, 2012
5 - 4
Zxcon[1:0]
These bits configure zero-crossing mode. The ZX pin outputs 5ms-width high level when voltage crosses zero.
00: positive zero-crossing
01: negative zero-crossing
10: all zero-crossing: both positive and negative zero-crossing (default)
11: no zero-crossing output
3 - 0
Pthresh[3:0]
These bits configure the L line and N line power difference threshold in anti-tampering mode.
Pthresh3
Pthresh2
Pthresh1
Pthresh0
Threshold
00
0
0
12.5%
0
0
0
1
6.25%
0
0
1
0
3.125% (default)
0
0
1
1
1.5625%
01
0
0
1%
01
0
1
2%
01
1
0
3%
01
1
1
4%
10
0
0
5%
10
0
1
6%
10
1
0
7%
10
1
1
8%
11
0
0
9%
1
1
0
1
10%
11
1
0
11%
1
1
1
1
12%



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