90E21 datasheet(22/57 Pages) IDT

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90E21/22/23/24

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC

January 10, 2012

SysStatus

System Status

Address: 01H

Type: Read/Clear

Default Value: 0000H

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.

LNchange

This bit indicates whether there is any change of the metering line (L line and N line).

0: metering line no change (default)

1: metering line changed

6RevQchq

This bit indicates whether there is any change with the direction of reactive energy.

0: direction of reactive energy no change (default)

1: direction of reactive energy changed

This status is enabled by the RevQEn bit(FuncEn, 02H).

RevPchg

This bit indicates whether there is any change with the direction of active energy.

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.

SagWarn

This bit indicates the voltage sag status.

0: no voltage sag (default)

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).

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.

CalErr1

CalErr0

AdjErr1

AdjErr0

765

432

LNchange

RevQchg

RevPchg

SagWarn

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