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CHANNEL_SEL
DataSheet
This method of determining the power factor does not take into
account the effect of any harmonics.
When Bits[10:9] (ANGLESEL) of the COMPMODE register are
set to 10b, the time delays (angles) between current channels are
measured. Table 10 shows the current channel-to-channel delay
measure-ments that are available.
Table 10. Available Channel-to-Channel Measurements
(ANGLESEL = 10b)
Channel-to-Channel Measurements
(COMPMODE[14]) ANGLE0 ANGLE1 ANGLE2
0 A to B A to C B to C
ADE7816
cycles. This feature can provide an early warning signal that the
line voltage is dropping out. The voltage sag feature is controlled
by two registers: SAGCYC (Address 0xE704) and SAGLVL
(Address 0xE509). These registers control the sag period and
the sag voltage threshold, respectively.
Sag detection is disabled by default and can be enabled by writing
a nonzero value to both the SAGCYC and SAGLVL registers. If
either register is set to 0, the sag feature is disabled. If a voltage
sag condition occurs, the sag bit (Bit 16) in the STATUS1 register
(Address 0xE503) is set to 1.
SETTING THE SAGCYC REGISTER
1
A to E
D to F
E to F
The 8-bit, unsigned SAGCYC register contains the programmable
÷ 2 ? × 255 = 2.55 sec
?
[ sec ]
(17)
T L =
÷ 2 ? × 255 = 2.125 sec
?
f L =
PERIOD[15: 0] + 1
The ANGLE0 (Address 0xE601), ANGLE1 (Address 0xE602), and
ANGLE2 (Address 0xE603) registers are 16-bit, unsigned registers
with 1 LSB corresponding to 3.90625 μs (256 kHz clock), which
corresponds to a resolution of 0.0703° (360° × 50 Hz/256 kHz)
for 50 Hz systems and 0.0843° (360° × 60 Hz/256 kHz) for 60 Hz
systems.
PERIOD MEASUREMENT
The ADE7816 provides the period measurement of the line in
the voltage channel. The period register (Address 0xE607) is
a 16-bit, unsigned register that updates every line period. Due
to internal filtering, a settling time of 30 ms to 40 ms is associ-
ated with this measurement.
The period measurement has a resolution of 3.90625 μs/LSB
(256 kHz clock), which represents 0.0195% (50 Hz/256 kHz)
when the line frequency is 50 Hz and 0.0234% (60 Hz/256 kHz)
when the line frequency is 60 Hz. The value of the period register
for 50 Hz networks is approximately 5120 (256 kHz/50 Hz) and
for 60 Hz networks is approximately 4267 (256 kHz/60 Hz). The
length of the register enables the measurement of line frequencies
that are as low as 3.9 Hz (256 kHz/2 16 ). The period register is stable
at ±1 LSB when the line is established, and the measurement
does not change.
The following expressions can be used to compute the line period
and frequency, using the period register:
PERIOD[15: 0] + 1
0 x 256 E 3
0 x 256 E 3
[ Hz ]
VOLTAGE SAG DETECTION
The ADE7816 includes a sag detection feature that warns the
user when the absolute value of the line voltage falls below the
programmable threshold for a programmable number of line
sag period. The sag period is the number of half line cycles below
which the voltage channel must remain before a sag condition
occurs. Each LSB of the SAGCYC register corresponds to a half
line cycle period. The SAGCYC register holds a maximum
value of 255.
At 50 Hz, the maximum sag cycle time is 2.55 seconds.
? 1 ?
? 50 ?
At 60 Hz, the maximum sag cycle time is 2.125 seconds.
? 1 ?
? 60 ?
If the SAGCYC value is modified after the feature is enabled,
the new SAGCYC period is effective immediately. Therefore, it
is possible for a sag event to be caused by a combination of sag
cycle periods. To prevent any overlap, the SAGLVL register should
be reset to 0 to effectively disable the feature before the new cycle
value is written to the SAGCYC register.
SETTING THE SAGLVL REGISTER
The content of the 24-bit SAGLVL register is compared to the
absolute value of the output from the HPF. Writing 5,928,256
(0x5A7540) to the SAGLVL register sets the sag detection level
at full scale. This results in the sag event triggering continuously.
Writing 0x00 or 0x01 puts the sag detection level at 0; therefore,
the sag event is never triggered.
VOLTAGE SAG INTERRUPT
The ADE7816 includes an interrupt that is associated with the
voltage sag detection feature. If this interrupt is enabled, a voltage
sag event causes the external IRQ1 pin to go low. This interrupt
is disabled by default and can be enabled by setting the sag bit
(Bit 16) in the MASK1 register, Address 0xE50B (see the
Interrupts section).
Rev. A | Page 29 of 48
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