90E21 Datasheet, PDF (30/57 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
These bits configure zero-crossing mode. The ZX pin outputs 5ms-width high level when voltage crosses zero.
00: positive zero-crossing
5-4
Zxcon[1:0] 01: negative zero-crossing
10: all zero-crossing: both positive and negative zero-crossing (default)
11: no zero-crossing output
These bits configure the L line and N line power difference threshold in anti-tampering mode.
3-0
Pthresh[3:0]
Pthresh3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Pthresh2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Pthresh1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Pthresh0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Threshold
12.5%
6.25%
3.125% (default)
1.5625%
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
11%
12%
Register
30
January 10, 2012