ADE9153AACPZ datasheet(24/50 Pages) AD

24 / 50 page

ADE9153A

Data Sheet

Rev. 0 | Page 24 of 50

The total active power calculation, AWATT, is updated

every 4 kSPS. With full-scale inputs, the AWATT value is

10,356,306 codes.

The low-pass filter, LPF2, is enabled by default (DISAPLPF = 0)

and must be set to this default value for typical operation. Disable

LPF2 by setting the DISAPLPF bit in the CONFIG0 register.

The following equation indicates how the gain and offset

calibration registers modify the results in the power register:

AWATT =











 

APGAIN

AWATT0 + AWATT_OS

APGAIN is a common gain for all power measurements: active,

reactive, and apparent power measurements.

Fundamental Reactive Power

The ADE9153A offers a fundamental reactive power measurement.

Figure 47 shows the datapath for the fundamental reactive

power calculation.

APGAIN

AFVAR_OS

AFVAR

AI_WAV

AV_WAV

FUNDAMENTAL

VAR

ENERGY/

POWER/CF

ACCUMUL ATION

Figure 47. Fundamental Reactive Power (AFVAR) Datapath

The fundamental reactive power calculation, AFVAR, is

updated every 4 kSPS. With full-scale inputs, the AFVAR value

is 10,356,306 codes.

LPF2 is enabled by default (DISRPLPF = 0) and must be set to

this default value for typical operation. Disable LPF2 by setting

the DISRPLPF bit in the CONFIG0 register.

The following equation indicates how the gain and offset

calibration registers modify the results in the power register:

AFVAR =











 

APGAIN

AFVAR0 + AFVAR_OS

Total Apparent Power

The ADE9153A offers a total apparent power measurement.

The datapath for the total apparent power calculation is shown

in Figure 48.

AIRMS_OS

APGAIN

AVRMS_OS

AIRMS

AVA

AVRMS

VNOM

LPF2

AI_WAV

215

LPF2

AV_WAV

ENERGY/

POWER/

CF ACCUMULATION

Figure 48. Total Apparent Power (AVA) Datapath

The total apparent power calculation, AVA, is updated every

4 kSPS. With full-scale inputs, the AVA value is 10,356,306 codes.

LPF2 is enabled by default (DISRPLPF = 0) and must be set to

this default value for typical operation. Disable LPF2 by setting

the DISRPLPF bit in the CONFIG0 register.

The ADE9153A offers a register, VNOM, to calculate the total

apparent power when the voltage is missing. This register is set

to correspond to a desired voltage rms value. If the VNOMA_

EN bit in the CONFIG0 register is set, the VNOM value is used

instead of AVRMS.

Energy Accumulation, Power Accumulation, and No

Load Detection Features

The ADE9153A calculates total active, fundamental reactive,

and total apparent energy. By default, the accumulation mode is

signed accumulation but can be changed to absolute, positive

only, or negative only for active and reactive energies using the

WATTACC and VARACC bits in the ACCMODE register.

Energy Accumulation

The energy is accumulated into a 42-bit signed internal energy

accumulator at 4 kSPS. The user readable energy register is

signed and 45 bits wide, split between two 32-bit registers as

shown in Figure 49. With full-scale inputs, the user energy

fDSP

INTERNAL ENERGY ACCUMULATOR

AWATTHR_HI

AWATT

AWATTHR_LO

Figure 49. Internal Energy Accumulator to AWATTHR_HI and AWATTHR_LO

Energy Accumulation Modes

The energy registers can accumulate a user defined number

of samples or half line cycles configured by the EGY_TMR_

MODE bit in the EP_CFG register. Half line cycle accumulation

uses the voltage channel zero crossings. The number of samples

or half line cycles is set in the EGY_TIME register. The maximum

value of EGY_TIME is 8191 decimal. With full-scale inputs, the

internal register overflows in 13.3 sec. For a 50 Hz signal, EGY_

TIME must be lower than 1329 decimal to prevent overflow

during half line cycle accumulation.

After EGY_TIME + 1 samples or half line cycles, the EGYRDY bit

is set in the status register and the energy register is updated.

The data from the internal energy register is added or latched to the

user energy register, depending on the EGY_LD_ACCUM bit

setting in the EP_CFG register.

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