ADE7953 datasheet(37/68 Pages) AD

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Data Sheet

ADE7953

Rev. A | Page 37 of 68

INSTANTANEOUS POWERS AND WAVEFORM SAMPLING

The ADE7953 provides access to the current and voltage

channel waveform data, along with the instantaneous active,

reactive, and apparent powers. This information allows the

instantaneous data to be analyzed in more detail, including

reconstruction of the current and voltage input for harmonic

analyses. These measurements are available from a set of

24-bit/32-bit signed registers (see Table 7).

All measurements are updated at a rate of 6.99 kHz (CLKIN/512).

The ADE7953 provides an interrupt status bit, WSMP, that is

triggered at a rate of 6.99 kHz, allowing measurements to be

synchronized with the instantaneous signal update rate. This

status bit is available in the IRQSTATA register (Address 0x22D

and Address 0x32D). This signal can also be configured to

trigger an interrupt on the external IRQ pin by setting the

WSMP bit (Bit 17) in the IRQENA register (Address 0x22C

and Address 0x32C).

The ADE7953 also provides the option of issuing an unlatched,

data-ready signal at the same rate of 6.99 kHz. This signal provides

the same information as the WSMP interrupt, but it is unlatched

and, therefore, does not need to be serviced each time that new

data is available. The data-ready signal goes high for a period of

280 ns before automatically returning low. The data-ready signal

is disabled by default and can be output on the REVP, ZX, and

ZX_I pins by setting the REVP_ALT, ZX_ALT, and ZXI_ALT

bits to 1001 in the ALT_OUTPUT register (Address 0x110).

Table 7. Waveform Sampling Registers

Address

Measurement

24-Bit

32-Bit

Active power

(Current Channel A)

AWATT

0x212

0x312

Active power

(Current Channel B)

BWATT

0x213

0x313

Reactive power

(Current Channel A)

AVAR

0x214

0x314

Reactive power

(Current Channel B)

BVAR

0x215

0x315

Apparent power

(Current Channel A)

AVA

0x210

0x310

Apparent power

(Current Channel B)

BVA

0x211

0x311

Current

(Current Channel A)

0x216

0x316

Current

(Current Channel B)

0x217

0x317

Voltage

(voltage channel)

0x218

0x318

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