90E21 Datasheet, PDF (22/57 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
SysStatus
System Status
Address: 01H
Type: Read/Clear
Default Value: 0000H
15
14
13
12
11
CalErr1
CalErr0
AdjErr1
AdjErr0
-
7
6
5
4
3
LNchange
RevQchg
RevPchg
-
-
10
9
8
-
-
-
2
1
0
-
SagWarn
-
Bit
Name
Description
15 - 14
CalErr[1:0]
These bits indicate CS1 checksum status.
00: CS1 checksum correct (default)
11: CS1 checksum error. At the same time, the WarnOut pin is asserted.
13 - 12
AdjErr[1:0]
These bits indicate CS2 checksum status.
00: CS2 checksum correct (default)
11: CS2 checksum error.
11 - 8
-
Reserved.
This bit indicates whether there is any change of the metering line (L line and N line).
7
LNchange 0: metering line no change (default)
1: metering line changed
This bit indicates whether there is any change with the direction of reactive energy.
6
RevQchq
0: direction of reactive energy no change (default)
1: direction of reactive energy changed
This status is enabled by the RevQEn bit(FuncEn, 02H).
This bit indicates whether there is any change with the direction of active energy.
5
RevPchg ^{0: direction of active energy no change (default)}
1: direction of active energy changed
This status is enabled by the RevPEn bit (FuncEn, 02H).
4-2
-
Reserved.
This bit indicates the voltage sag status.
0: no voltage sag (default)
1
SagWarn 1: voltage sag
Voltage sag is enabled by the SagEn bit (FuncEn, 02H).
Voltage sag status can also be reported by the WarnOut pin. It is enabled by the SagWo bit(FuncEn, 02H).
0
-
Reserved.
Note: Any of the above events will prompt the IRQ pin to be asserted, which can be supplied to external MCU as an interrupt.
Register
22
January 10, 2012