90E21 Datasheet, PDF (44/57 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
Smean
L Line Mean Apparent Power
Address: 4FH
Type: Read
Default Value: 0000H
15
14
Smean15
Smean14
7
6
Smean7
Smean6
13
Smean13
5
Smean5
12
Smean12
4
Smean4
11
Smean11
3
Smean3
10
Smean10
2
Smean2
9
Smean9
1
Smean1
8
Smean8
0
Smean0
Bit
15 - 0
Name
Smean[15:0]
Description
L line mean apparent power.
Complement, MSB is always '0'. Data format is XX.XXX, which corresponds to 0~+32.767kVA.
If current is specially handled by MCU, the power of the 90E21/22/23/24 and the actual power have the same multiple relation-
ship as the current.
Irms2
N Line Current rms
Address: 68H
Type: Read
Default Value: 0000H
15
14
Irms2_15
Irms2_14
7
6
Irms2_7
Irms2_6
13
Irms2_13
5
Irms2_5
12
Irms2_12
4
Irms2_4
11
Irms2_11
3
Irms2_3
10
Irms2_10
2
Irms2_2
9
Irms2_9
1
Irms2_1
8
Irms2_8
0
Irms2_0
Bit
15 - 0
Name
Irms2[15:0]
Description
N line current rms.
Data format is XX.XXX, which corresponds to 65.535A.
For cases when the current exceeds 65.535A, it is suggested to be handled by MCU in application. For example, the register
value can be calibrated to 1/2 of the actual value during calibration, then multiplied by 2 in application.
Register
44
January 10, 2012