ADE7569 datasheet(31/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 31 of 144

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 33 shows how the ADE7566/ADE7569/ADE7166/

ADE7169 power supply inputs are set up in this application.

Figure 34 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 33. 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

backup data and prepare for battery switchover if desired. The

relative spacing of these interrupts depends on the design of the

power supply.

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

power supply starts to fail in the power meter application shown

in Figure 33, 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 36 and Figure 37.

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 33. 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

VSWOUT CONNECTED TO VBAT

BSO EVENT

(FBSO = 1)

Figure 34. Power Supply Management Interrupts and Battery Switchover with Only VDD Enabled for Battery Switchover

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