ADE9153AACPZ datasheet(28/50 Pages) AD

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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 the 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/25.

Similarly, VPEAK stores the peak voltage value in the VPEAKVAL

bits. VPEAKVAL is equal to AV_WAV/25. 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

CAPACITIVE:

CURRENT LEADS

VOLTAGE

INDUCTIVE:

CURRENT LAGS

VOLTAGE

WATT

VAR

270° LAGGING

90° LAGGING

INDUCTIVE:

CURRENT LAGS

VOLTAGE

CAPACITIVE:

CURRENT LEADS

VOLTAGE

WATT (–)

VAR (+)

QUADRANT II

WATT (+)

VAR (+)

QUADRANT I

WATT (–)

VAR (–)

QUADRANT III

WATT (+)

VAR (–)

QUADRANT IV

WATT(+) INDICATES POWER RECEIVED (IMPORTED FROM GRID)

WATT(–) INDICATES POWER DELIVERED (EXPORTEDTO GRID)

θ2 = 60° PF2 = 0.5 IND

θ1 = –30° PF1 = 0.866 CAP

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/217) +

(TEMP_OFFSET/25)

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

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