Cirrus-logic AN366 Bedienungsanleitung PDF herunterladen (Seite 41)

AN366

AN366REV2 41

STOP CONVERSIONS

(See Figure 37.)

SDI = 0x90 0x15 0xFFFFFF Read PF1 (page 16, register 21)

SDO = 0xFF 0xFF 0x410F40 (0.508278)

SDI = 0x90 0x19 0xFFFFFF Read PF2 (page 16, register 25)

SDO = 0xFF 0xFF 0x4106A8 (0.5080157)

For 1 to Count {

PF1SUM = PF1SUM + PF1

PF2SUM = PF2SUM + PF2}

Figure 37. Conversion Window

PF1AVG = PF1SUM ÷ Count

PF2AVG = PF1SUM ÷ Count

PHASE1_OFFSET = ARCCOS(0.5083238) - 60º = -0.55224327

PHASE2_OFFSET = ARCCOS(0.5085984) - 60º = -0.57051489

Use this constant stored from PC/Controller memory in following calculations.

READ PF

CALCULATE

PHASE

OFF SET =

arccos(PF)-60º

RESOLUTION

MULTIPLIER

0.008789 (50Hz)

0.010547 @ 60Hz

STOP

CONVERSIONS

0xD8

Shown

Main

Flow

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 49 50

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Cirrus-logic AN366 Bedienungsanleitung Seite 41