ADE7569 datasheet(29/136 Pages) AD

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Preliminary Technical Data

ADE7566/ADE7569

Rev. PrA | Page 29 of 136

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 pre-regulated 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 24 shows how the ADE7566/ADE7569 power supply

inputs would be set up in this application.

Figure 25 shows the sequence of events that would occur if the

main power supply generated by the PSU started to fail in the

power meter application shown in Figure 24. The SAG

detection can provide the earliest warning of a potential

problem on VDD. When a SAG event occurs, the 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 26 shows the sequence of events that would occur if the

main power supply started to fail in the power meter application

shown in Figure 24, 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 28.

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 24. 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

VSW CONNECTED TO VBAT

BSO EVENT

(FBSO = 1)

Figure 25. Power Supply Management Interrupts and Battery Switchover with Only VDD Enabled for Battery Switchover

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