CS5480 datasheet(23/70 Pages) CIRRUS

23 / 70 page

CS5480

DS980F3

5.5 Meter Configuration Modes

There are two distinct meter configuration modes in the

CS5480 that affect how the total active, reactive, and ap-

parent power calculations are performed. The CS5480

has power results for each current channel as well as total

power registers (PSUM, QSUM, and SSUM). The total power

registers are calculated from either one or both channels,

depending on the meter configuration modes. See Table 2

for power calculations in each mode.

The Meter Configuration (MCFG) bits in the configuration

(Config2) register set the meter configuration modes. For

each meter mode, the current channels are interpreted dif-

ferently. In the one voltage and two line currents (1V – 2I)

mode, the CS5480 treats the two currents as individual

contributors to the overall power. In the one voltage, one

line current, and one neutral current (1V – 1I – 1N) mode,

the currents are treated as duplicate copies of the same

load current, and the total power is calculated from the

highest current or the one the customer has specified. The

MCFG multiplexers in Figure 14 show the data path for

both modes.

Table 2. Meter Configuration Modes

VFRMS

I2RMS

I1RMS

N

P2AVG

P1AVG

PSUM

N

Q2AVG

Q1AVG

QSUM

SSUM

VFIX

(Config2)

MCFG[1:0]

(Config2)

ICHAN

(IHOLD = 1)

Figure 14. Channel Selection and Tamper Protection Flow

Meter

Mode

MCFG

[1:0]

Total Power

Calculations

1V-2I

1V-1I-1N

(I1RMS > I2RMS)*

(P1AVG > P2AVG)*

(Default)

1V-1I-1N

(I1RMS < I2RMS)*

(P1AVG < P2AVG)*

(Default)

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