ADE75 datasheet(29/148 Pages) AD

29 / 148 page

Preliminary Technical Data

ADE75xx/ADE71xx

Rev. PrE | Page 29 of 148

BCTRL

Voltage

Supervisory

Voltage

Supervisory

ac input

SAG

Detection

PSU

3.3V

Regulator

5 - 12V dc

Power Supply

Management

(240, 220, 110V typical)

VDCIN

VDD

VSWOUT

VBAT

IPSMF SFR

(Addr. 0xF8)

VSW

Figure 11. Power Supply Management for Energy Meter Application

Figure 12 shows the sequence of events that will be generated

for the power meter application in Figure 11 if the main power

supply generated by the PSU starts to fail. 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 will depend on the design of

the power supply.

Figure 13 shows the sequence of events that will be generated

for the power meter application shown in Figure 11 if the main

power supply starts to fail, with battery switchover on low VDCIN

or low VDD enabled.

V -V

DCIN

SAG LEVEL trip point

2.75V

SAG Event

(FSAG=1)

VEvent

1.2V

DCIN

SAGCYC=1

Automatic Battery switchover

connected to V

BAT

If switchover on low V

is enabled,

BSO Event

(FBSO=1)

(FVDC=1)

Figure 12: Power Supply Management Interrupts and Battery Switchover with only VDD enabled for battery switchover

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