CS5464 datasheet(35/46 Pages) CIRRUS

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CS5464

DS682F3

E3MODE[1:0]

E3 Output Mode (with E1MODE enabled)

00 = Power Fail Monitor

01 = Energy Sign

10 = not used

11 = not used

POS

Positive Energy Only. Suppresses negative values in P1AVG and P2AVG. If a negative value is

calculated, zero will be stored instead.

AFC

Enables automatic line frequency measurement which sets Epsilon every time a new line fre-

quency measurement completes. Epsilon is used to control the gain of the 90 degree phase

shift integrator used in quadrature power calculations.

8.3.6 Line to Sample Frequency Ratio (Epsilon) – Address: 17

Default = 0.0125 (4.0 kHz x 0.0125 or 50 Hz)

Epsilon

is the ratio of the input line frequency to the output word rate (OWR). It can either be written by the ap-

plication program or calculated automatically from the line frequency (from the voltage input) using the AFC bit

in the Modes register. It is a two's complement value in the range of -1.0

 value  1.0, with the binary point to

the right of the MSB. Negative values are not used.

8.3.7 Pulse Output Width (PulseWidth) – Address: 14

Default = 1 (250 uS at OWR = 4 kHz)

PulseWidth

sets the duration of energy pulses. The actual pulse duration is the contents of PulseWidth divided

by the output word rate (OWR). PulseWidth is an integer in the range of 1 to 8,388,607.

8.3.8 Pulse Output Rate (PulseRate) – Address: 15

Default= -1

PulseRate

sets the full-scale frequency for E1, E2, E3 pulse outputs. For a 4 kHz sample rate, the maximum

pulse rate is 2 kHz. This is a two's complement value in the range of -1

 value  1, with the binary point to the

left of the MSB.

Refer to 6.10 Energy Pulse Rate on page 20 for more information.

MSB

LSB

-(20)2-1

2-2

2-3

2-4

2-5

2-6

2-7

.....

2-17

2-18

2-19

2-20

2-21

2-22

2-23

MSB

LSB

222

221

220

219

218

217

216

.....

MSB

LSB

-(20)2-1

2-2

2-3

2-4

2-5

2-6

2-7

.....

2-17

2-18

2-19

2-20

2-21

2-22

2-23

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