ADE7566ASTZF8-RL2 AD [Analog Devices], ADE7566ASTZF8-RL2 Datasheet - Page 29

• Manufacturer Part Number: ADE7566ASTZF8-RL2
• Description: Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
• Manufacturer: AD [Analog Devices]

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