ade7166 Analog Devices, Inc., ade7166 Datasheet - Page 28

• Manufacturer Part Number: ade7166
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

ADE7566/ADE7569/ADE7166/ADE7169
POWER SUPPLY ARCHITECTURE
Each ADE7566/ADE7569/ADE7166/ADE7169 has two power
supply inputs, V
power supply at V
secondary power supply, with a maximum of 3.7 V can be
connected to the V
ADE7166/ADE7169 connect V
to derive power for the ADE7566/ADE7569/ ADE7166/ADE7169
circuitry. The V
internal power supply (V
current of 6 mA. This pin can also be used to power a limited
number of peripheral components. The 2.5 V analog supply (V
and the 2.5 V supply for the core logic (V
chip linear regulators from V
supply architecture of ADE7566/ADE7569/ADE7166/ADE7169.
The ADE7566/ADE7569/ADE7166/ADE7169 provide
automatic battery switchover between V
the voltage level detected at V
BCTRL input can be used to trigger a battery switchover. The
conditions for switching V
V
input pin that can be connected to a 0 V to 3.3 V dc signal. This
input is intended for power supply supervisory purposes and
does not provide power to the ADE7566/ADE7569/ADE7166/
ADE7169 circuitry (see the
BATTERY SWITCHOVER
The ADE7566/ADE7569/ADE7166/ADE7169 monitor V
and V
configured based on the status of V
Battery switchover is enabled by default. Setting Bit 1 in the
Battery Switchover Configuration SFR (BATPR, 0xF5) disables
battery switchover so that V
(see
Peripheral Configuration SFR (PERIPH, 0xF4), which is
described in Table 19. Bit 6 is set when V
V
DD
BCTRL
DD
are described in the
Table 18). The source of V
and cleared when V
DCIN
V
. Automatic battery switchover from V
DCIN
POWER SUPPLY
MANAGEMENT
SCRATCHPAD
V
SWOUT
DD
DD
Figure 31. Power Supply Architecture
DD
TEMPERATURE ADC
and V
BAT
V
for full operation. A battery backup, or
BAT
output pin reflects the voltage at the
input. Internally, the ADE7566/ADE7569/
BAT
SWOUT
Battery Switchover section. V
V
SWOUT
ADC
SW
SWOUT
, and require only a single 3.3 V
SWOUT
Battery Switchover section).
DD
ADC
LCD
V
DD
) and has a maximum output
DD
SWOUT
is connected to V
SWOUT
is always connected to V
from V
.
or V
or V
Figure 31 shows the power
DD
is indicated by Bit 6 in the
BAT
DCIN
LDO
LDO
RTC
, V
DD
to V
DD
DCIN
. Additionally, the
SWOUT
INTD
to V
and V
V
V
3.3V
SWOUT
INTD
, or the BCTRL pin.
INTA
) are derived by on-
is connected to
BAT
DD
BAT
, which is used
BAT
and back to
to V
.
2.5V
SPI/I
UART
MCU
ADE
based on
DCIN
BAT
2
DD
SWOUT
C
, V
can be
is an
INTA
BAT
Rev. A | Page 28 of 144
,
)
The battery switchover functionality provided by the
ADE7566/ADE7569/ADE7166/ADE7169 allows a seamless
transition from V
option ensures a stable power supply to the ADE7566/
ADE7569/ADE7166/ADE7169, as long as the external battery
voltage is above 2.75 V. It allows continuous code execution
even while the internal power supply is switching from V
V
available when V
Power supply monitor (PSM) interrupts can be enabled to
indicate when battery switchover occurs and when the V
power supply is restored (see the Power Supply Monitor
Interrupt (PSM) section.)
V
The following three events switch the internal power supply
(V
•
•
•
Switching from V
To switch V
that are enabled to force battery switchover must be false:
•
•
•
DD
BAT
SWOUT
to V
V
from V
BATPRG[1:0] bits in the Battery Switchover Configuration
SFR (BATPR, 0xF5) = 0b01. Setting these bits disables
switchover based on V
disabled by default.
V
from V
the BATPR SRF are cleared.
Falling edge on BCTRL. When the battery control pin,
BCTRL, goes low, V
external switchover signal can trigger a switchover to V
at any time. Setting bits INT1PRG[4:2] to 0bx01 in the
Interrupt Pins Configuration SFR (INTPR, 0xFF) enables
the battery control pin (see Table 16).
V
condition is enabled, V
remains above 1.2 V and V
V
V
BCTRL enabled. V
is high, and the first or second bullet point is satisfied.
and back. Note that the energy metering ADCs are not
DCIN
DD
DCIN
DD
DD
) from V
BAT
< 2.75 V. When V
< 2.75 V enabled. V
remains above 2.75 V.
< 1.2 V. When V
< 1.2 V and V
DD
DD
SWOUT
to V
to V
DD
BAT
from V
DD
BAT
BAT
to V
BAT
to V
is being used for V
. This event is enabled when the
. This event is enabled when BATPRG[1:0] in
to V
BAT
SWOUT
DD
BAT
SWOUT
BAT
:
DCIN
DD
DD
DCIN
. An automatic battery switchover
< 2.75 V enabled. If the low V
SWOUT
to V
SWOUT
switches back to V
falls below 2.75 V, V
falls below 1.2 V, V
switches from V
. Battery switchover on low V
DD
DD
switches to V
remains above 2.75 V.
, all of the following events
switches back to V
SWOUT
.
DD
DD
DD
SWOUT
to V
after V
SWOUT
after BCTRL
DD
switches
BAT
switches
after
. This
DCIN
DD
DD
DCIN
DCIN
to
BAT
is