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ADE7932 数据表(PDF) 70 Page - Analog Devices |
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ADE7932 数据表(HTML) 70 Page - Analog Devices |
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70 / 120 page  ADE7978/ADE7933/ADE7932 Data Sheet Rev. 0 | Page 70 of 120 ENERGY REGISTERS AND CFx OUTPUTS FOR VARIOUS ACCUMULATION MODES Bits[1:0] (WATTACC[1:0]) in the ACCMODE register (Address 0xE701) specify the accumulation mode of the total and fundamental active powers when signals proportional to the active powers are selected at the CFx pins (the CFxSEL[2:0] bits in the CFMODE register are set to 000 or 011). These bits also specify the accumulation mode of the watthour energy registers (AWATTHR, BWATTHR, CWATTHR, AFWATTHR, BFWATTHR, and CFWATTHR). When WATTACC[1:0] = 00 (the default value), the active powers are sign accumulated in the watthour energy registers before enter- ing the energy-to-frequency converter. Figure 87 shows how signed active power accumulation works. In this mode, the CFx pulses synchronize perfectly with the active energy accumulated in the xWATTHR and xFWATTHR registers because the powers are sign accumulated in both datapaths. NEG POS POS APNOLOAD SIGN = POSITIVE NEG NO LOAD THRESHOLD ACTIVE POWER NO LOAD THRESHOLD ACTIVE ENERGY REVAPx BIT IN STATUS0 xWSIGN BIT IN PHSIGN Figure 87. Active Power Signed Accumulation Mode When WATTACC[1:0] = 01, the active powers are accumulated in positive only mode. When the powers are negative, the watt- hour energy registers do not accumulate them. The CFx pulses are generated based on signed accumulation mode. When WATTACC[1:0] = 01, the CFx pulses do not synchronize perfectly with the active energy accumulated in the xWATTHR and xFWATTHR registers because the powers are accumulated differently in each datapath. Figure 88 shows how positive only active power accumulation works. NEG POS POS APNOLOAD SIGN = POSITIVE NEG NO LOAD THRESHOLD ACTIVE POWER NO LOAD THRESHOLD ACTIVE ENERGY REVAPx BIT IN STATUS0 xWSIGN BIT IN PHSIGN Figure 88. Active Power Positive Only Accumulation Mode The WATTACC[1:0] = 10 setting is reserved, and the ADE7978 behaves identically to the case when WATTACC[1:0] = 00. When WATTACC[1:0] = 11, the active powers are accumulated in absolute mode. When the powers are negative, they change sign and are accumulated together with the positive power in the watthour registers before entering the energy-to-frequency converter. In this mode, the CFx pulses synchronize perfectly with the active energy accumulated in the xWATTHR and xFWATTHR registers because the powers are accumulated in the same way in both datapaths. Figure 89 shows how absolute active power accumulation works. NEG POS POS APNOLOAD SIGN = POSITIVE NEG NO LOAD THRESHOLD ACTIVE POWER NO LOAD THRESHOLD ACTIVE ENERGY REVAPx BIT IN STATUS0 xWSIGN BIT IN PHSIGN Figure 89. Active Power Absolute Accumulation Mode |
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