Cirrus-logic AN366 Manual do Utilizador descarregar pdf (Página 15)

AN366

AN366REV2 15

RESET

(See Note 1)

ROGOWSKI

SENSOR?

ENABLE

HIGH PASS

FILTER

ENABLE

INTEGRATOR on

CURRENT &

HIGH PASS on

VOLTAGE

FULL LOAD

AVAILABLE?

APPLY

REFERENCE

LINE VOLTAGE

AND LOAD

CURRENT

(Note 5)

SET SCALE

0.6 · LOAD ÷ FS

(Note 6)

READ

IRMS, VRMS,

PAVG, QAVG, PF

START

CONTINUOUS

CONVERT

0xD5

STOP

CONVERSIONS

0xD8

SEND AC GAIN

CALIBRATION

0xFE

ACCURACY

IN SPEC?

CHECK

SETUP or

FAIL

READ VGAIN,

IGAIN, IACOFF,

POFF, QOFF, PC,

RegChk

STORE

CALIBRATION

CONSTANTS &

CHECKSUM

POWER UP

CALIBRATION

COMPLETE

MEASUREMENT?

PERFORM

CALIBRATION

DRDY

SET?

SINGLE

CONVERSION

YES

VALID RESET

CHECKSUM?

(Note 3)

CONFIRM

REFERENCE

SIGNALS ARE

APPLIED

CORRECTLY

Tsettle =

2000ms

(Note 2)

SampleCount (N)=

16,000

(Note 2)

START

CONTINUOUS

CONVERSION

AND VERIFY

METER

ACCURACY

CLEAR

DRDY

PERFORM PHASE

COMPENSATION,

IACOFF CALIBRATION,

and POWER OFFSET

CORRECTION if

NECESSARY

Note 1: The default setting for all registers should be set before performing calibration. Resetting the device restores the default setting

for all registers.

Note 2: Larger numbers in the Tsettle and SampleCount registers will increase calibration precision.

Note 3: Other configurations and controls might be necessary.

Note 4: For an expanded view showing more information about the main calibration flow, see Main Calibration Flow Diagram Using the

CDB5484 on page 29.

Note 5: See Non-full-scale Gain Calibration on page 9.

Note 6: Scale register is only in calibration path and does not require resetting to 0.6 after the calibration.

Figure 8. Main Calibration Flow

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 49 50

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