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| 型號(hào)： | ADE7169F16 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
| 中文描述： | 單相電能計(jì)量集成電路8052微控制器，RTC和LCD驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 59/140頁(yè) |
| 文件大?。?/td> | 1359K |
| 代理商： | ADE7169F16 |
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Preliminary Technical Data
ADE7169F16
energy register is divided by 1. VARDIV is an 8-bit unsigned
register. After dividing by VARDIV, the reactive energy is
accumulated in a 49-bit internal energy accumulation register.
The upper 24 bits of this register are accessible through a read
to the reactive energy register (VARHR[23:0]). A read to the
RVARHR register returns the content of the VARHR register
and the upper 24 bits of the internal register are cleared. As
shown in Figure 45, the reactive power signal is accumulated in
an internal 49-bit signed register. The reactive power signal can
be read from the waveform register by setting the WAVMODE
register (0x0D) and setting the WFSM bit in the Interrupt
Enable Register 3 SFR (MIRQENH, 0xDB). Like the current
and voltage channels waveform sampling modes, the waveform
date is available at sample rates of 27.9 kSPS, 14 kSPS, 7 kSPS, or
3.5 kSPS.
Rev. PrD | Page 59 of 140
Figure 40 shows this energy accumulation for full-scale signals
(sinusoidal) on the analog inputs. These curves also apply for
the reactive energy accumulation
Note that the energy register contents rolls over to full-scale
negative (0x800000) and continues to increase in value when
the power or energy flow is positive. Conversely, if the power is
negative, the energy register underflows to full-scale positive
(0x7FFFFF) and continues to decrease in value.
By using the interrupt enable register, the ADE7169F16 can be
configured to issue an ADE interrupt to the 8052 core when the
reactive energy register is half-full (positive or negative) or
when an overflow or underflow occurs.
Integration time under steady Load
As mentioned in the active energy section, the discrete time
sample period (T) for the accumulation register is 1.22 μs
(5/CLKIN). With full-scale sinusoidal signals on the analog
inputs and the VARGAIN and VARDIV registers set to 0x000,
the integration time before the reactive energy register
overflows is calculated as follows:
Time
=
xCCCCD
0
FFFF
FFFF,
xFFFF,
0
× 1.22 μs = 409.6 s = 6.82 min (15)
When VARDIV is set to a value different from 0, the integration
time varies, as shown in Equation 16.
VARDIV
Time
Time
WDIV
×
=
=
0
(16)
Reactive energy accumulation modes
VAR signed accumulation mode
The ADE7169F16 reactive energy default accumulation mode is
a signed accumulation based on the reactive power information.
VAR anti-tamper accumulation mode
The ADE7169F16 is placed in VAR anti-tamper accumulation
mode by setting the SAVARM bit in the ACCMODE register
(0x0F). In this mode, the reactive power is accumulated
depending on the sign of the active power. When active power
is positive, the reactive power is added as it is to the reactive
energy register. When active power is negative, the reactive
power is subtracted to the reactive energy accumulator – see
Figure 46. The CF pulse also reflects this accumulation method
when in this mode. The default setting for this mode is off.
Transitions in the direction of power flow, and no-load
threshold are active in this mode.
POS
POS
INTERRUPT STATUS REGISTERS
NEG
APSIGN Flag
NO-LOAD
THRESHOLD
ACTIVE POWER
NO-LOAD
THRESHOLD
REACTIVE ENERGY
NO-LOAD
THRESHOLD
REACTIVE POWER
NO-LOAD
THRESHOLD
Figure 46. Reactive Energy Accumulation in Anti-tamper Accumulation Mode
VAR absolute accumulation mode
The ADE7169F16 is placed in absolute accumulation mode by
setting the ABSVARM bit in the ACCMODE register (0x0F). In
absolute accumulation mode, the reactive energy accumulation
is done using the absolute reactive power, ignoring any
occurrence of power below the no-load threshold, as shown in
Figure 42 for the active energy. The CF pulse also reflects this
accumulation method when in this mode. The default setting
for this mode is off. Transitions in the direction of power flow,
and no-load threshold are active in this mode.
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| ADE75 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
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