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ADE9078 数据表(PDF) 30 Page - Analog Devices |
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ADE9078 数据表(HTML) 30 Page - Analog Devices |
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30 / 108 page  Data Sheet ADE9078 Rev. 0 | Page 29 of 107 Current Channel Measurement Update Rates Table 9 indicates the registers that hold current channel measurements and the rate at which they update. Table 9. Current Channel Measurement Update Rates Register Name Description Update Rate (kSPS) AI_SINC_DAT IA sinc4 filter output 16 BI_SINC_DAT IB sinc4 filter output 16 CI_SINC_DAT IC sinc4 filter output 16 NI_SINC_DAT IN sinc4 filter output 16 AI_LPF__DAT IA sinc4 + IIR low-pass filter output and decimation 4 BI_LPF__DAT IB sinc4 + IIR low-pass filter output and decimation 4 CI_LPF__DAT IC sinc4 + IIR low-pass filter output and decimation 4 NI_LPF__DAT IN sinc4 + IIR low-pass filter output and decimation 4 AI_PCF Instantaneous current on IA 4 BI_PCF Instantaneous current on IB 4 CI_PCF Instantaneous current on IC 4 NI_PCF Instantaneous current on IN 4 AIRMS Filtered based total rms of IA 4 BIRMS Filtered based total rms of IB 4 CIRMS Filtered based total rms of IC 4 NIRMS Filtered based total rms of IN 4 ISUMRMS Filtered rms of sum of instantaneous currents (AI_PCF + BI_PCF + CI_PCF ± NI_PCF) (see the Neutral Current RMS, RMS of Sum of Instantaneous Currents section) 4 IPEAK Peak current channel sample (see the Peak Detection section) 4 ANGLx_x Voltage to current or current to current phase angle (see the Angle Measurement section) CLKIN/24 = 512 ADC_REDIRECT Multiplexer The ADE9078 provides a multiplexer that allows any ADC output to be redirected to any digital processing datapath. By default, each modulator is mapped to its corresponding datapath. For example, the IAP and IAN pins go into the IA modulator, which is mapped to the IxA digital processing datapath. Write to the ADC_REDIRECT register to change the ADC to digital channel mapping. The redirection can be useful to simplify PCB layout, depending on if the ADE9078 is on the top or bottom of the PCB by redirecting the IA ADC output to the IC digital datapath and the IC ADC output to the IA digital datapath. To achieve this configuration, write IA_DIN = 010 and IC_DIN = 000 in the ADC_REDIRECT register. Alternatively, the VA voltage channel output can be used for all three datapaths by writing VB_DIN = 100 and VC_DIN = 100 in the ADC_REDIRECT register. The neutral current channel does not offer a zero-crossing output or angle measurements. To calibrate the phase of the neutral current NI_PCF signal, direct the neutral current ADC output to Phase B digital current channel and check how its angle corresponds to Phase A by writing IA_DIN = 111. REFERENCE Σ-Δ MODULATOR VIN IA_DIN[2:0] AI_SINC_DAT AI_LPF_DAT IA_MOD 011 IB_MOD IC_MOD IN_MOD VA_MOD VB_MOD VC_MOD IA_MOD 000 001 010 100 101 110 111 Figure 43. ADC_REDIRECT Modulator to Digital Datapath Multiplexing Current Channel Gain, xIGAIN There are many sources of gain error in an energy metering system. The current sensor, including current transformer burden resistors, may have some error. There is device to device gain error in the ADE9078 device itself and the voltage reference may have some variation (see Table 1 for the device specifications). The ADE9078 provides a current gain calibration register so that each metering device has the same current channel scaling. The current channel gain varies with xIGAIN as shown in the following equation: GAIN HPF xIGAIN Gain Channel Current _ 2 1 27 × + = Use the following equation to calculate the xIGAIN value for a given current channel gain: xIGAIN = round((Current Channel Gain − 1) × 227) where round() is a function to round to the nearest integer. The current channel gain can be positive or negative. For example, to increase the gain of the current channel up by 10% to 1.1, xIGAIN = round((1.1 − 1) × 227) = 13,421,773 = 0x00CC CCCD To decrease the gain by 10% to 0.9: xIGAIN = round((0.9 − 1) × 227) = −13,421,773 = 0xFF33 3333 |
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