90E21 Datasheet, PDF (32/57 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
5.3.2 MEASUREMENT CALIBRATION REGISTER
AdjStart
Measurement Calibration Start Command
Address: 30H
Type: Read/Write
Default Value: 6886H
15
14
13
AdjStart15
AdjStart14
AdjStart13
7
6
5
AdjStart7
AdjStart6
AdjStart5
12
AdjStart12
4
AdjStart4
11
AdjStart11
3
AdjStart3
10
AdjStart10
2
AdjStart2
9
AdjStart9
1
AdjStart1
8
AdjStart8
0
AdjStart0
Bit
15 - 0
Name
AdjStart[15:0]
Description
Measurement Calibration Start Command
6886H: Power-on value. No measurement.
5678H: Measurement calibration startup command. After 5678H is written to this register, registers 31H-3AH resume to their
power-on values. The 90E21/22/23/24 starts to measure regardless of the correctness of diagnosis. The AdjErr[1:0] bits
(SysStatus, 01H) are not set and the IRQ pin does not report any interrupt.
8765H: Check the correctness of the 31H-3AH registers. If correct, normal measurement. If not correct, measurement function is
disabled, the AdjErr[1:0] bits (SysStatus, 01H) are set and the IRQ pin reports interrupt.
Others: No measurement. The AdjErr[1:0] bits (SysStatus, 01H) are set and the IRQ pin reports interrupt.
Ugain
Voltage rms Gain
Address: 31H
Type: Read/Write
Default Value: 6720H
15
Ugain15
7
Ugain7
14
Ugain14
6
Ugain6
13
Ugain13
5
Ugain5
12
Ugain12
4
Ugain4
11
Ugain11
3
Ugain3
10
Ugain10
2
Ugain2
9
Ugain9
1
Ugain1
8
Ugain8
0
Ugain0
Bit
15 - 0
Name
Ugain[15:0]
Description
Voltage rms Gain. For details, please refer to IDT application note AN-641.
Note: the Ugain15 bit should only be '0'
Register
32
January 10, 2012