ADE7880 datasheet(40/104 Pages) AD

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ADE7880

Data Sheet

Rev. A | Page 40 of 104

Table 12. Settling Time for I RMS Measurement

Integrator Status

50 Hz Input Signals

the integrator is enabled, that is, when Bit 0 (INTEN) in the

CONFIG register is set to 1, the equivalent rms value of a full-

scale sinusoidal signal at 50 Hz is 3,759,718 (0x395E66) and at

60 Hz is 3,133,207 (0x2FCF17).

60 Hz Input Signals

Integrator Off

580 ms

Integrator On

700 ms

The accuracy of the current rms is typically 0.1% error from

the full-scale input down to 1/1000 of the full-scale input when

PGA = 1. Additionally, this measurement has a bandwidth of

3.3 kHz. It is recommended to read the rms registers synchronous

to the voltage zero crossings to ensure stability. The IRQ1 inter-

rupt can be used to indicate when a zero crossing has occurred

(see the

section).

shows the settling time for

the I rms measurement, which is the time it takes for the rms

when starting from 0.

Interrupts

Table 12

As stated in the Current Waveform Gain Registers section, the

serial ports of the ADE7880 work on 32-, 16-, or 8-bit words.

Similar to the register presented in Figure 64, the AIRMS,

BIRMS, CIRMS, NIRMS 24-bit signed registers are accessed as

32-bit registers with the eight MSBs padded with 0s.

24-BIT NUMBER

0000

Figure 64. 24-Bit AIRMS, BIRMS, CIRMS and NIRMS Registers Transmitted as

32-Bit Words

0xAEB86F =

–5,326,737

0x514791 =

5,326,737

CURRENT SIGNAL FROM

HPF OR INTEGRATOR

(IF ENABLED)

LPF

xIRMSOS[23:0]

xIRMS[23:0]

Figure 65. Current RMS Signal Processing

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