ade7566acpzf8-rl Analog Devices, Inc., ade7566acpzf8-rl Datasheet - Page 35

• Manufacturer Part Number: ade7566acpzf8-rl
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

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 preregulated dc voltage, typically
5 V to 12 V, can be connected to V
A 3.6 V battery can be connected to V
the ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/
ADE7569 power supply inputs are set up in this application.
Figure 35 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 34. The SAG detection can
provide the earliest warning of a potential problem on V
SAG LEVEL TRIP POINT
(240V, 220V, 110V TYPICAL)
SAGCYC = 1
AC INPUT
Figure 35. 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
DCIN
through a resistor divider.
BAT
. Figure 34 shows how
Figure 34. Power Supply Management for Energy Meter Application
REGULATOR
ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569
3.3V
V
BCTRL
DD
SWOUT
V
DD
V
SAG EVENT
.
BAT
(FSAG = 1)
DCIN
V
) is
V
Rev. B | Page 35 of 152
V
DD
N
P
64
45
49
50
60
61
58
DETECTION
SAG
When a SAG event occurs, user code can be configured to back up
data and prepare for battery switchover if desired. The relative
spacing of these interrupts depends on the design of the power
supply.
Figure 36 shows the sequence of events that occurs if the main
power supply starts to fail in the power meter application shown
in Figure 34, with battery switchover on low V
enabled.
Finally, the transition between V
power supply modes (see the Operating Modes section) are
represented in Figure 37 and Figure 38.
SUPERVISORY
SUPERVISORY
VOLTAGE
VOLTAGE
V
(FVDCIN = 1)
DCIN
EVENT
t
1
DD
POWER SUPPLY
MANAGEMENT
IF SWITCHOVER ON LOW V
Enabled for Battery Switchover
OCCURS. V
t
2
AUTOMATIC BATTERY SWITCHOVER
SWOUT
BSO EVENT
(FBSO = 1)
V
DD
IS CONNECTED TO V
SW
and V
(ADDR. 0xF8)
IPSMF SFR
DD
BAT
IS ENABLED,
and the different
DCIN
BAT
or low V
.
DD