ADE5166 datasheet(27/148 Pages) AD

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Preliminary Technical Data

ADE5166/ADE5169/ADE5566/ADE5569

Rev. PrB | Page 27 of 148

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 12 shows how the ADE5166/ADE5169/ADE5566/

ADE5569 power supply inputs are set up in this application.

Figure 13 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 12. 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 rela-

tive spacing of these interrupts depends on the design of the

power supply.

Figure 14 shows the sequence of events that occurs if the main

power supply starts to fail in the power meter application shown

in Figure 12, 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 15 and Figure 16.

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 12. 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 13. Power Supply Management Interrupts and Battery Switchover with Only VDD Enabled for Battery Switchover

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