ade7166 Analog Devices, Inc., ade7166 Datasheet - Page 31

• Manufacturer Part Number: ade7166
• 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
resistor divider. A 3.6 V battery can be connected to V
Figure 33 shows how the ADE7566/ADE7569/ADE7166/
ADE7169 power supply inputs are set up in this application.
Figure 34 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 33. 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 34. 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 33. Power Supply Management for Energy Meter Application
REGULATOR
DCIN
3.3V
through a
BAT
V
BCTRL
DD
SWOUT
.
V
DD
V
SAG EVENT
.
BAT
(FSAG = 1)
DCIN
V
Rev. A | Page 31 of 144
) is
V
V
DD
N
P
64
45
49
50
60
61
58
DETECTION
SAG
When a SAG event occurs, 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 35 shows the sequence of events that occurs if the main
power supply starts to fail in the power meter application shown
in Figure 33, with battery switchover on low V
enabled.
Finally, the transition between V
power supply modes (see the Operating Modes section) are
represented in Figure 36 and Figure 37.
SUPERVISORY
SUPERVISORY
VOLTAGE
VOLTAGE
ADE7566/ADE7569/ADE7166/ADE7169
V
(FVDCIN = 1)
DCIN
EVENT
t
1
DD
POWER SUPPLY
MANAGEMENT
IF SWITCHOVER ON LOW V
Enabled for Battery Switchover
t
2
AUTOMATIC BATTERY SWITCHOVER
V
SWOUT
CONNECTED TO V
BSO EVENT
(FBSO = 1)
V
DD
SW
and V
(ADDR. 0xF8)
IPSMF SFR
DD
BAT
IS ENABLED,
BAT
and the different
DCIN
or low V
DD