90E21 Datasheet, PDF (41/57 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
5.5 MEASUREMENT REGISTER
Irms
L Line Current rms
Address: 48H
Type: Read
Default Value: 0000H
15
Irms15
7
Irms7
14
Irms14
6
Irms6
13
Irms13
5
Irms5
12
Irms12
4
Irms4
11
Irms11
3
Irms3
10
Irms10
2
Irms2
9
Irms9
1
Irms1
8
Irms8
0
Irms0
Bit
15 - 0
Name
Irms[15:0]
Description
L line current rms.
Data format is XX.XXX, which corresponds to 0 ~ 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.
Urms
Voltage rms
Address: 49H
Type: Read
Default Value: 0000H
15
Urms15
7
Urms7
14
Urms14
6
Urms6
13
Urms13
5
Urms5
12
Urms12
4
Urms4
11
Urms11
3
Urms3
10
Urms10
2
Urms2
9
Urms9
1
Urms1
8
Urms8
0
Urms0
Bit
15 - 0
Name
Urms[15:0]
Description
Voltage rms.
Data format is XXX.XX, which corresponds to 0 ~ 655.35V.
Register
41
January 10, 2012