ade7566 Analog Devices, Inc., ade7566 Datasheet - Page 26

• Manufacturer Part Number: ade7566
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

ADE7566/ADE7569
POWER SUPPLY ARCHITECTURE
Each ADE7566/ADE7569 have two power supply inputs, V
V
operation. A battery backup, or secondary power supply, with a
maximum of 3.7 V can be connected to the V
the ADE7566/ADE7569 connect V
to derive power for the ADE7566/ADE7569 circuitry. The V
output pin reflects the voltage at the internal power supply (V
and has a maximum output 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
(V
30 shows the power supply architecture of ADE7566/ADE7569.
The ADE7566/ADE7569 provide automatic battery switchover
between V
or V
battery switchover. The conditions for switching V
to V
section. V
3.3 V dc signal. This input is intended for power supply super-
visory purposes and does not provide power to the ADE7566/
ADE7569 circuitry (see the Battery Switchover section).
BATTERY SWITCHOVER
The ADE7566/ADE7569 monitor V
battery switchover from V
the status of V
enabled by default. Setting Bit 1 in the Battery Switchover Configu-
ration SFR (BATPR, 0xF5) disables battery switchover so that
V
is indicated by Bit 6 in the Peripheral Configuration SFR (PERIPH,
0xF4), which is described in Table 115. Bit 6 is set when V
connected to V
BAT
BCTRL
DD
INTD
, and require only a single 3.3 V power supply at V
BAT
DCIN
is always connected to V
) are derived by on-chip linear regulators from V
and back to V
. Additionally, the BCTRL input can be used to trigger a
V
DCIN
DCIN
POWER SUPPLY
DD
MANAGEMENT
SCRATCHPAD
and V
is an input pin that can be connected to a 0 V to
DD
V
DD
DD
, V
Figure 30. Power Supply Architecture
TEMPERATURE ADC
and cleared when V
V
DCIN
BAT
BAT
DD
INTA
based on the voltage level detected at V
, or the BCTRL pin. Battery switchover is
are described in the Battery Switchover
V
) and the 2.5 V supply for the core logic
ADC
SW
DD
ADC
LCD
V
to V
SW
SWOUT
(see Table 18). The source of V
BAT
DD
DD
or V
, V
can be configured based on
LDO
LDO
RTC
SW
BAT
BAT
is connected to V
, and V
V
V
to V
3.3V
INTD
INTA
BAT
input. Internally,
SW
DCIN
, which is used
SW
2.5V
SPI/I
UART
SW
MCU
ADE
. Automatic
DD
from V
. Figure
2
C
for full
SWOUT
DD
SW
BAT
Rev. 0 | Page 26 of 136
and
SW
DD
is
.
DD
SW
)
The battery switchover functionality provided by the
ADE7566/ADE7569 allows a seamless transition from V
V
power supply to the ADE7566/ADE7569, 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
ADCs are not 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.)
Switching from 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:
•
•
•
BAT
SW
. An automatic battery switchover option ensures a stable
) from V
V
V
in the Battery Switchover Configuration SFR (BATPR, 0xF5)
= 0b01. Setting these bits disables switchover based on
V
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
remains above 2.75 V.
BCTRL enabled. V
high and the first or second bullet point is satisfied.
DCIN
DD
DCIN
DD
DCIN
DD
DD
to V
< 2.75 V. When V
< 2.75 V enabled. V
. Battery switchover on low V
to V
< 1.2 V. When V
< 1.2 V and V
DD
SW
BAT
DD
to V
BAT
back from V
. This event is enabled when the BATPRG[1:0] bits
to V
and back. Note that the energy metering
BAT
DD
BAT
BAT
. This event is enabled when BATPRG[1:0] in
to V
to V
:
SW
DD
SW
DCIN
BAT
switches back to V
DD
DD
BAT
< 2.75 V enabled. If the low V
switches from V
SW
SW
falls below 2.75 V, V
falls below 1.2V, V
to V
switches to V
BAT
switches back to V
DD
remains above 2.75 V.
is being used for V
DD
, all of the following events
DCIN
is disabled by default.
DD
DD
DD
to V
after V
SW
after BCTRL is
SW
switches from
DD
BAT
switches
after V
SW
. This
DCIN
.
DD
DD
DCIN
to
DD
BAT