ADE7569 datasheet(44/136 Pages) AD

44 / 136 page

ADE7566/ADE7569

Preliminary Technical Data

Rev. PrA | Page 44 of 136

ANALOG

INPUT

RANGE

HPF

ADC

REFERENCE

0.5V, 0.25V,

0.125V, 62.5mV,

31.3mV

VOLTAGE RMS (V rms)

CALCULATION

PGA2

VOLTAGE CHANNEL

WAVEFORM

DATA RANGE

0xD70B

0x0000

0x28F5

ACTIVE AND REACTIVE

POWER CALCULATION

LPF1

f–3dB = 63.7Hz

MODE1[6]

ZX SIGNAL

DATA RANGE FOR 60Hz SIGNAL

0xE230

0x0000

0x1DD0

ZX DETECTION

ZX SIGNAL

DATA RANGE FOR 50Hz SIGNAL

0xDFC9

0x0000

0x2037

VOLTAGE PEAK DETECT

×1, ×2, ×4,

×8, ×16

{GAIN[7:5]}

WAVEFORM SAMPLE

*WHEN DIGITAL INTEGRATOR IS ENABLED, FULL-SCALE OUTPUT DATA IS ATTENUATED

DEPENDING ON THE SIGNAL FREQUENCY BECAUSE THE INTEGRATOR HAS A –20dB/DECADE

FREQUENCY RESPONSE. WHEN DISABLED, THE OUTPUT WILL NOT BE FURTHER ATTENUATED.

Figure 36. ADC and Signal Processing in Voltage Channel

Voltage Channel ADC

Figure 36 shows the ADC and signal processing chain for the

voltage channel. In waveform sampling mode, the ADC outputs

a signed, twos complement, 24-bit data-word at a maximum

of 25.6 kSPS (MCLK/160). The ADC produces an output code

that is approximately between 0x28F5 (+10,485d) and 0xD70B

(−10,485d).

Channel Sampling

The waveform samples of the current ADC and voltage ADC

can also be routed to the waveform registers to be read by the

MCU core. The active, reactive, apparent power, and energy

calculation remain uninterrupted during waveform sampling.

When in waveform sampling mode, one of four output sample

rates can be chosen by using Bits DTRT[1:0] of the WAVMODE

12.8 kSPS, 6.4 kSPS, or 3.2 kSPS. If the WFSM enable bit is set

in the Interrupt Enable Register 3 SFR (MIRQENH, 0xDB), the

8052 core has a pending ADE interrupt. The sampled signals

selected in the WAVMODE register are latched into the

Waveform SFRs when the waveform high byte (WAV1H or

WAV2H) is read.

The ADE interrupt stays active until the WFSM status bit is

cleared (see the Energy Measurement Interrupts section).

di/dt CURRENT SENSOR AND DIGITAL

INTEGRATOR FOR THE ADE7569

A di/dt sensor, a feature available for the AD7569, but not for

the AD7566, detects changes in the magnetic field caused by ac-

currents. Figure 37 shows the principle of a di/dt current sensor.

MAGNETIC FIELD CREATED BY CURRENT

(DIRECTLY PROPORTIONAL TO CURRENT)

+ EMF (ELECTROMOTIVE FORCE)

– INDUCED BY CHANGES IN

MAGNETIC FLUX DENSITY (di/dt)

Figure 37. Principle of a di/dt Current Sensor

The flux density of a magnetic field induced by a current is

directly proportional to the magnitude of the current. The

changes in the magnetic flux density passing through a conductor

loop generate an electromotive force (EMF) between the two

ends of the loop. The EMF is a voltage signal that is proportional

to the di/dt of the current. The voltage output from the di/dt

current sensor is determined by the mutual inductance between

the current-carrying conductor and the di/dt sensor. The current

signal needs to be recovered from the di/dt signal before it can

be used. An integrator is therefore necessary to restore the

signal to its original form.

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