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ADE7854/ADE7858/ADE7868/ADE7878
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 4,191,910 (0x3FF6A6) and at
60 Hz is 3,493,258 (0x354D8A).
Data Sheet
power-up and DSP reset cases, it would typically take about
1.2 seconds for a FS/1000 signal to be settled.
Table 13. Settling Time for I rms Measurement
Integrator Status  50 Hz Input signals  60 Hz Input signals
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
Integrator Off
Integrator On
440 ms
550 ms
440 ms
500 ms
PGA = 1. Additionally, this measurement has a bandwidth of
2 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 Interrupts section). Table 13 shows the settling time for
the I rms measurement, which is the time it takes for the rms
register to reflect the value at the input to the current channel
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE78xx work on 32-, 16-, or 8-bit words.
Similar to the register presented in Figure 36, the AIRMS,
BIRMS, CIRMS, and NIRMS ( ADE7868 and ADE7878 only)
24-bit signed registers are accessed as 32-bit registers with the
eight MSBs padded with 0s.
when starting from 0 to full scale. However, during the chip
xIRMSOS[23:0]
2 7
CURRENT SIGNAL FROM
HPF OR INTEGRATOR
(IF ENABLED)
x 2
LPF
√
xIRMS[23:0]
0x5A7540 =
5,928,256
0V
0xA58AC0 =
–5,928,256
Figure 59. Current RMS Signal Processing
Rev. H | Page 44 of 100
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