ADE7166_15 datasheet(35/152 Pages) AD

35 / 152 page

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569

Rev. B | Page 35 of

152

USING THE POWER SUPPLY FEATURES

In an energy meter application, the 3.3 V power supply (VDD) is

typically generated from the ac line voltage and regulated to 3.3 V

by a voltage regulator IC. The preregulated dc voltage, typically

5 V to 12 V, can be connected to VDCIN through a resistor divider.

A 3.6 V battery can be connected to VBAT. Figure 34 shows how

the ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/

ADE7569 power supply inputs are set up in this application.

Figure 35 shows the sequence of events that occurs if the main

power supply generated by the PSU starts to fail in the power

meter application shown in Figure 34. The SAG detection can

provide the earliest warning of a potential problem on VDD.

When a SAG event occurs, user code can be configured to back up

data and prepare for battery switchover if desired. The relative

spacing of these interrupts depends on the design of the power

supply.

Figure 36 shows the sequence of events that occurs if the main

power supply starts to fail in the power meter application shown

in Figure 34, with battery switchover on low VDCIN or low VDD

enabled.

Finally, the transition between VDD and VBAT and the different

power supply modes (see the Operating Modes section) are

represented in Figure 37 and Figure 38.

VOLTAGE

SUPERVISORY

POWER SUPPLY

MANAGEMENT

IPSMF SFR

(ADDR. 0xF8)

VSW

VBAT

VSWOUT

VDD

VOLTAGE

SUPERVISORY

VDCIN

3.3V

REGULATOR

5V TO 12V DC

PSU

SAG

DETECTION

BCTRL

(240V, 220V, 110V TYPICAL)

AC INPUT

Figure 34. Power Supply Management for Energy Meter Application

VDD

VDCIN

VP – VN

2.75V

1.2V

SAG LEVEL TRIP POINT

SAGCYC = 1

SAG EVENT

(FSAG = 1)

VDCIN EVENT

(FVDCIN = 1)

IF SWITCHOVER ON LOW VDD IS ENABLED,

AUTOMATIC BATTERY SWITCHOVER

OCCURS. VSWOUT IS CONNECTED TO VBAT.

BSO EVENT

(FBSO = 1)

Figure 35. Power Supply Management Interrupts and Battery Switchover with Only VDD Enabled for Battery Switchover

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