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Data Sheet
INPUTS
The following section provides details on the ADE7816 input
connections that are required for correct functionality.
POWER AND GROUND
VDD and AGND, DGND
To power the ADE7816 , a 3.3 V dc input voltage should be
provided between the VDD pin and the AGND and DGND pins.
In addition, the PULL_HIGH and PULL_LOW pins must be
connected to 3.3 V and AGND, respectively. This configuration
3.3V
ADE7816
When the start-up sequence is complete, all registers are at their
default value, and the I 2 C port is the active serial port. Commu-
nication with the ADE7816 can begin. See the Communication
section for more details.
To start the energy and rms computations, the internal DSP
must be powered up after all configuration registers are set to
their desired values. The DSP is started by setting the run register
DSP section for more information.
REFERENCE CIRCUIT
4.7μF
+
0.22μF
4.7μF
+
0.22μF
REF IN/OUT
3.3V
24
2 PULL_HIGH
3 PULL_LOW
26
5
The nominal reference voltage at the REF IN/OUT pin is 1.2 V ±
0.075%. The REF IN/OUT pin can be overdriven by an external 1.2 V
reference source. If Bit 0 (EXTREFEN) in the CONFIG2 register
(Address 0xEC01) is cleared to 0 (the default value), the ADE7816
Figure 24. Applying Power to the ADE7816
The ADE7816 contains an on-chip power supply monitor that
supervises the power supply (VDD). When the voltage applied
to the VDD pin is below 2 V ± 10%, the chip is in an inactive
state. After VDD crosses the 2 V ± 10% threshold, the power
supply monitor keeps the ADE7816 in an inactive state for an
additional 26 ms. This time delay allows VDD to reach the
minimum specified operating voltage of 3.3 V ? 10%. When
the minimum specified operating voltage is met and the
PULL_HIGH and PULL_LOW pins are tied to VDD and
AGND, respectively, the internal circuitry is enabled. This
process is accomplished in approximately 40 ms.
When the start-up sequence is complete and the ADE7816 is
ready to receive communication from a microcontroller, the
RSTDONE flag is set in the STATUS1 register (Address 0xE503).
An external interrupt is triggered on the IRQ1 pin. The RSTDONE
interrupt is enabled by default and cannot be disabled; therefore,
an external interrupt always occurs at the end of a power-up
procedure or hardware or software reset.
It is highly recommended that the RSTDONE interrupt be used
by the microcontroller to gate the first communication with the
mented. However, because the start-up sequence can vary from
part to part and over temperature, a timeout of a least 100 ms is
recommended. The RSTDONE interrupt provides the most time-
efficient way of monitoring the completion of the ADE7816
start-up sequence.
The AVDD and DVDD output pins provide access to the on-
chip analog and digital LDOs. When the ADE7816 is fully
powered up, these pins are at 2.5 V. If the internal reference is
being used, the REF IN/OUT pin outputs 1.2 V (see the Reference
Circuit section).
uses the internal voltage reference. If Bit 0 is set to 1, the external
voltage reference is used.
The voltage of the ADE7816 internal reference drifts slightly with
temperature; see the Specifications section for the temperature
coefficient specification (in ppm/°C). The value of the temperature
drift varies from part to part. Because the reference is used for
all ADCs, any x% drift in the reference results in a 2x% deviation
of the meter accuracy.
RESET
Hardware Reset
To initiate a hardware reset of the ADE7816 , the RESET pin must
be pulled low for at least 10 μs. After the RESET pin returns high,
all registers return to their default values. The ADE7816 signals the
end of the transition period by triggering the IRQ1 interrupt pin
low and setting Bit 15 (RSTDONE) in the STATUS1 register to 1.
This bit is set to 0 during the transition period and changes to 1
when the transition ends.
Software Reset Functionality
Bit 7 (SWRST) in the CONFIG register (Address 0xE618) manages
the software reset functionality in the ADE7816 . The default value
of this bit is 0. If Bit 7 is set to 1, the ADE7816 enters the software
reset state. In this state, all internal registers are set to their default
values, with the exception of the CONFIG2 register, which retains
its existing value. In addition, the choice of which serial port is in
use (I 2 C or SPI) remains unchanged if the lock-in procedure was
executed previously (see the Communication section for details).
When the software reset ends, Bit 7 (SWRST) in the CONFIG
register is cleared to 0, the IRQ1 interrupt pin is set low, and Bit 15
(RSTDONE) in the STATUS1 register is set to 1. RSTDONE is
set to 0 during the transition period and changes to 1 when the
transition ends.
It is recommended that all meters be designed to have both
software and hardware reset capability.
Rev. A | Page 17 of 48
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