ADE7169F16 datasheet(44/140 Pages) AD

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ADE7169F16

Preliminary Technical Data

Rev. PrD | Page 44 of 140

Voltage Channel ADC

Figure 21 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)—see Figure 22.

x1, x2, x4,

x8, x16

ANALOG

INPUT

RANGE

HPF

ADC

REFERENCE

0.5V, 0.25V,

0.125V, 62.5mV,

31.3mV

WAVEFORM SAMPLE

VOLTAGE RMS (VRMS)

CALCULATION

PGA2

{GAIN[7:5]}

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

Figure 22. ADC and Signal Processing in Voltage Channel

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 0 and 1 of the WAVMODE

12.8kSPS, 6.4 kSPS, or 3.2 kSPS—see Table 30. 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

waveform high byte (WAV1H or WAV2H) is read.

The ADE interrupt stays active until the WFSM status bit is

cleared—see Energy measurement interrupts section.

FAULT DETECTION

The ADE7169F16 incorporates a fault detection scheme that

warns of fault conditions and allows the ADE7169F16 to

continue accurate measurement during a fault event. The

ADE7169F16 does this by continuously monitoring both

current inputs (IA and IB). These currents will be referred for

ease of understanding as phase and neutral (return) currents. In

the ADE7169F16, a fault condition is defined when the

difference between IA and IB is greater than 6.25% of the active

channel. If a fault condition is detected and the inactive channel

is larger than the active channel, the ADE7169F16 automatically

switches to current measurement to the inactive channel.

During a fault, the active, reactive, current rms and apparent

powers are generated using the larger of the two currents. On

power-up, IA is the current input selected for Active, Reactive,

and Apparent power and Irms calculations.

To prevent false alarm, averaging is done for the fault detection

and a fault condition is detected approximately 1 second after

the event. The fault detection is automatically disabled when the

voltage signal is less than 0.3% of the full-scale input range. This

eliminates false detection of a fault due to noise at light loads.

Because the ADE7169F16 looks for a difference between the

voltage signals on IA and IB, it is important that both current

transducers be closely matched.

Channel selection Indication

The current channel selected for measurement is indicated by

bit 7 (ICHANNEL) in the ACCMODE register (0x0F). When

this bit is cleared, IA is selected and when it is set, IB is selected.

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