Datasheet
Data Sheet ADE7953
Rev. B | Page 37 of 72
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
Measurement Register
Address
24-Bit 32-Bit
Active power
(Current Channel A)
AWAT T 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)
IA 0x216 0x316
Current
(Current Channel B)
IB 0x217 0x317
Voltage
(voltage channel)
V 0x218 0x318