CS5464-IS View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5464-IS

Three-channel, Single-phase Power/Energy IC

Cirrus Logic 

CS5464

specified in Figure 2. Timing Diagram for E1, E2, and E3

on page 13.

Figure 6 illustrates the pulse output format with positive

active energy and negative reactive energy.

E1

E2

E3

Figure 6. Active and Reactive energy pulse outputs

The pulse output frequency of E1 is directly proportional

to the active power calculated from the input signals. To

calculate the output frequency of E1, the following trans-

fer function can be utilized:

FREQP

=

V-----I--N------×-----V----G-----A-----I--N------×-----I--I--N------×----I---G-----A----I--N------×-----P----F------×----P-----u----l-s----e----R----a----t--e--

VREFIN2

FREQP = Average frequency of active energy E1 pulses [Hz]

VIN = rms voltage across VIN+ and VIN- [V]

VGAIN = Voltage channel gain

IIN = rms voltage across IIN+ and IIN- [V]

IGAIN = Current channel gain

PF = Power Factor

PulseRate = PulseRateE x (MCLK/K)/2048 [Hz]

VREFIN = Voltage at VREFIN pin [V]

With MCLK = 4.096 MHz, PF = 1, and default settings,

the pulses will have an average frequency equal to the

frequency specified by PulseRateE when the input sig-

nals applied to the voltage and current channels cause

full-scale readings in the instantaneous voltage and cur-

rent registers. The maximum pulse frequency from the

E1 pin is (MCLK/K)/2048.

5.5.2 Apparent Energy Mode

Pin E2 outputs apparent energy pulses when the Oper-

ational Mode Register bit E2MODE = 1. Pin E3 outputs

apparent energy pulses when the Operational Mode

Register bits E3MODE[1:0] = 3 (11b). Figure 7 illus-

trates the pulse output format with apparent energy on

E2 (E2MODE = 1 and E3MODE[1:0] = 0)

E1

E2

E3

Figure 7. Apparent energy pulse outputs

The pulse output frequency of E2 (and/or E3) is directly

proportional to the apparent power calculated from the

input signals. Since apparent power is without reference

to an impedance phase angle, the following transfer

function can be utilized to calculate the output frequency

on E2 (and/or E3).

FREQS

=

V-----I--N------×-----V----G-----A-----I--N------×-----I--I--N------×----I---G-----A----I--N------×-----P----u----l--s---e----R-----a----t--e--

VREFIN2

FREQS = Average frequency of apparent energy E2 and/or E3 pulses [Hz]

VIN = rms voltage across VIN+ and VIN- [V]

VGAIN = Voltage channel gain

IIN = rms voltage across IIN+ and IIN- [V]

IGAIN = Current channel gain

PulseRate = PulseRateE x (MCLK/K)/2048 [Hz]

VREFIN = Voltage at VREFIN pin [V]

With MCLK = 4.096 MHz and default settings, the puls-

es will have an average frequency equal to the frequen-

cy specified by PulseRateE when the input signals

applied to the voltage and current channels cause

full-scale readings in the instantaneous voltage and cur-

rent registers. The maximum pulse frequency from the

E2 (and/or E3) pin is (MCLK/K)/2048. The E2 (and/or

E3) pin outputs apparent energy, but has no energy di-

rection indicator.

5.5.3 Reactive Energy Mode

Reactive energy pulses are output on pin E3 by setting

bit E3MODE[1:0] = 0 (default) in the Operational Mode

Register. Positive reactive energy is registered by E3

falling when E2 is high. Negative reactive energy is reg-

istered by E3 falling when E2 is low. Figure 6 on

page 19 illustrates the pulse output format with negative

reactive energy output on pin E3 and the sign of the en-

ergy on E2. The E3 and E2 pulse output switching char-

acteristics are specified in Figure 2 on page 13.

The pulse output frequency of E3 is directly proportional

to the reactive power calculated from the input signals.

To calculate the output frequency on E3, the following

transfer function can be utilized:

FREQQ

=

V-----I--N------×-----V----G-----A-----I--N------×-----I--I--N------×----I---G-----A----I--N------×-----P----Q-------×----P-----u----l-s----e----R----a----t---e-

VREFIN2

FREQQ = Average frequency of reactive energy E3 pulses [Hz]

VIN = rms voltage across VIN+ and VIN- [V]

VGAIN = Voltage channel gain

IIN = rms voltage across IIN+ and IIN- [V]

IGAIN = Current channel gain

PQ = 1 – PF2

PulseRate = PulseRateE x (MCLK/K)/2048 [Hz]

VREFIN = Voltage at VREFIN pin [V]

With MCLK = 4.096 MHz, PF = 0 and default settings,

the pulses will have an average frequency equal to the

frequency specified by PulseRateE when the input sig-

nals applied to the voltage and current channels cause

full-scale readings in the instantaneous voltage and cur-

DS682PP1

19

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