90E21 datasheet(25/57 Pages) IDT

25 / 57 page

90E21/22/23/24

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

January 10, 2012

5.3

METERING/ MEASUREMENT CALIBRATION AND CONFIGURATION

5.3.1

METERING CALIBRATION AND CONFIGURATION REGISTER

CalStart

Calibration Start Command

PLconstH

High Word of PL_Constant

Address: 20H

Type: Read/Write

Default Value: 6886H

Bit

Name

Description

15 - 0

CalStart[15:0]

Metering calibration start command:

6886H: Power-on value. Metering function is disabled.

5678H: Metering calibration startup command. After 5678H is written to this register, registers 21H-2BH resume to their power-

on values. The 90E21/22/23/24 starts to meter and output energy pulses regardless of the correctness of diagnosis. The

CalErr[1:0] bits (SysStatus, 01H) are not set and the WarnOut/IRQ pins do not report any warning/interrupt.

8765H: Check the correctness of the 21H-2BH registers. If correct, normal metering. If not correct, metering function is disabled,

the CalErr[1:0] bits (SysStatus, 01H) are set and the WarnOut/IRQ pins report warning/interrupt.

Others: Metering function is disabled. The CalErr[1:0] bits (SysStatus, 01H) are set and the WarnOut/IRQ pins report warning/

interrupt.

Address: 21H

Type: Read/Write

Default Value: 0015H

Bit

Name

Description

15 - 0

PLconstH[15:0]

The PLconstH[15:0] and PLconstL[15:0] bits are high word and low word of PL_Constant respectively.

PL_Constant is a constant which is proportional to the sampling ratios of voltage and current, and inversely proportional to the

Meter Constant. PL_Constant is a threshold for energy calculated inside the chip, i.e., energy larger than PL_Constant will be

accumulated in the corresponding energy registers and then output on CFx.

It is suggested to set PL_constant as a multiple of 4 so as to double or redouble Meter Constant in low current state to save ver-

ification time.

Note: PLconstH takes effect after PLconstL are configured.

For details, please refer to IDT application note AN-641.

CalStart15

CalStart14

CalStart13

CalStart12

CalStart11

CalStart10

CalStart9

CalStart8

765

432

CalStart7

CalStart6

CalStart5

CalStart4

CalStart3

CalStart2

CalStart1

CalStart0

PLconstH15

PLconstH14

PLconstH13

PLconstH12

PLconstH11

PLconstH10

PLconstH9

PLconstH8

765

432

PLconstH7

PLconstH6

PLconstH5

PLconstH4

PLconstH3

PLconstH2

PLconstH1

PLconstH0

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