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ADE5166ASTZF62-RL Datasheet(PDF) 51 Page - Analog Devices |
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ADE5166ASTZF62-RL Datasheet(HTML) 51 Page - Analog Devices |
51 / 148 page ADE5166/ADE5169 Rev. 0 | Page 51 of 148 1 1 0 1 0 0 1 70 PGA1 IP/IPA IN I ADC 1 HPF 24 PGA2 VP VN V ADC 2 24 LPF2 V I 60Hz 0.1° I V CHANNEL 2 DELAY REDUCED BY 4.48µs (0.1°LEAD AT 60Hz) 0x0B IN PHCAL[7:0] PHCAL[7:0] –231.93µs TO +48.83µs 60Hz 1 1 DELAY BLOCK 1.22µs/LSB Figure 55. Phase Calibration RMS CALCULATION The root mean square (rms) value of a continuous signal V(t) is defined as ∫ × = T rms dt t V T V 0 2 ) ( 1 () (1) For time sampling signals, rms calculation involves squaring the signal, taking the average, and obtaining the square root. The ADE5166/ADE5169 implement this method by serially squaring the input, averaging them, and then taking the square root of the average. The averaging part of this signal processing is done by implementing a low-pass filter (LPF3 in Figure 56, Figure 57, and Figure 58). This LPF has a −3 dB cutoff frequency of 2 Hz when MCLK = 4.096 MHz. ) sin( 2 t V t V ω × = () t V V t V ω − = 2 cos ) ( 2 2 2 V (2) where V is the rms voltage. (3) When this signal goes through LPF3, the cos(2ωt) term is attenu- ated and only the dc term, Vrms2 (shown as V2 in Figure 56), goes through. LPF3 INPUT V2 (t) = V2 –V2 cos(2ωt) V2 (t) = V2 V(t) = √2 × V sin(ωt) Figure 56. RMS Signal Processing The Irms signal can be read from the waveform register by set- ting the WAVMODE register (Address 0x0D) and setting the WFSM bit (Bit 5) in the Interrupt Enable 3 SFR (MIRQENH, Address 0xDB). Like the current and voltage channels waveform sampling modes, the waveform data is available at sample rates of 25.6 kSPS, 12.8 kSPS, 6.4 kSPS, and 3.2 kSPS. It is important to note that when the current input is larger than 40% of full scale, the Irms waveform sample register does not represent the true processed rms value. The rms value processed with this level of input is larger than the 24-bit read by the wave- form register, making the value read truncated on the high end. |
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