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Preliminary Technical Data
USING THE POWER SUPPLY FEATURES
In an energy meter application, the 3.3 V power supply (V DD ), 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 V DCIN through a
resistor divider. A 3.6 V battery can be connected to V BAT .
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
ADE7566/ADE7569
problem on V DD . 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 V DCIN or low
V DD enabled.
Finally, the transition between V DD and V BAT and the different
Power Supply Modes (see the Operating Modes section) are
represented in Figure 28.
(240V, 220V, 110V TYPICAL)
BCTRL 45
AC INPUT
V P
V N
49
50
SAG
DETECTION
5V TO 12V DC
V DCIN
64
VOLTAGE
SUPERVISORY
VOLTAGE
SUPERVISORY
POWER SUPPLY
MANAGEMENT
IPSMF SFR
(ADDR. 0xF8)
PSU
3.3V
REGULATOR
V DD
60
V SW
V SWOUT 61
V BAT 58
Figure 24. Power Supply Management for Energy Meter Application
V P – V N
SAG LEVEL TRIP POINT
SAGCYC = 1
V DCIN
1.2V
V DD
t 1
2.75V
t 2
SAG EVENT
(FSAG = 1)
V DCIN EVENT
(FVDCIN = 1)
IF SWITCHOVER ON LOW V DD IS ENABLED,
AUTOMATIC BATTERY SWITCHOVER
V SW CONNECTED TO V BAT
BSO EVENT
(FBSO = 1)
Figure 25. Power Supply Management Interrupts and Battery Switchover with Only V DD Enabled for Battery Switchover
Rev. PrA | Page 29 of 136
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