Datasheet

ADE9153A Data Sheet
Rev. 0 | Page 28 of 50
Overcurrent Indication
The ADE9153A monitors the rms½ value on current channels
to determine overcurrent events. If an rms½ current is greater
than the user configured threshold in the OI_LVL register, the
OIx bit in the EVENT_STATUS register is set. The overcurrent
event generates an interrupt on the
IRQ
pin.
The OIx_EN bits in the CONFIG3 register select the current
channel to monitor for overcurrent events. The OIx bits in the
EVENT_STATUS register indicate which current channel
exceeded the threshold. The overcurrent value is stored in the
OIA and OIB registers.
Peak Detection
The ADE9153A records the peak value measured on all three
channels from t he AI_WAV, AV_WAV, and BI_WAV waveforms.
The PEAK_SEL bits in the CONFIG3 register allow the user to
select which channel to monitor.
The IPEAK register stores the peak current value in the
IPEAKVAL bits and indicates which phase currents reached the
value in the IPPHASE bits. IPEAKVAL is equal to xI_WAV/2
5
.
Similarly, VPEAK stores the peak voltage value in the VPEAKVAL
bits. V PEAKVAL is equ a l to AV_WAV/2
5
. After a read, the VPEAK
and IPEAK registers reset.
Power Factor
The power factor calculation, APF, is updated every 1.024 sec.
The sign of the APF calculation follows the sign of AWATT. To
determine if power factor is leading or lagging, refer to the sign
of the total or fundamental reactive energy and the sign of the
APF or AWATT value, as shown in Figure 54.
The power factor result is stored in 5.27 format. The highest
power factor value is 0x07FF FFFF, which corresponds to a power
factor of 1. A power factor of −1 is stored as 0xF800 0000. To
determine the power factor from the APF register value, use the
following equation:
Power Factor = APF × 2
−27
V
I
CAPACITIVE:
CURRENT LEADS
VOLTAGE
INDUCTIVE:
CURRENT LAGS
VOLTAGE
WATT
V
AR
270° LAGGING
90° LAGGING
INDUCTIVE:
C
URRENT LAGS
V
OLTAGE
C
APACITIVE:
C
URRENT LEADS
V
OLTAGE
WAT T ( –)
VAR (+)
QUADRANT II
WATT (+)
VAR (+)
QUADRANT I
WAT T ( –)
VAR (–)
QUADRANT III
WAT T ( + )
VAR (–)
QUADRANT IV
WATT(+) INDICATES POWER RECEIVED (IMPORTED FROM GRID)
WATT(–) INDICATES POWER DELIVERED (EXPORTEDTO GRID)
θ
2
= 60° PF
2
= 0.5 IND
θ
1
= –30° PF
1
= 0.866 CAP
16258-154
Figure 54. WATT and VAR Power Sign for Capacitive and Inductive Loads
Temperature
The temperature reading is available in the TEMP_RSLT register.
To convert the temperature range into Celsius, use the following
equation:
Temperature (°C) = TEMP_RSLT × (−TEMP_GAIN/2
17
) +
(TEMP_OFFSET/2
5
)
During the manufacturing of each device, the TEMP_GAIN
and TEMP_OFFSET bits of Register TEMP_TRIM are programed.
To configure the temperature sensor, program the TEMP_CFG
register.
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