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參數(shù)資料
| 型號(hào)： | ADE7757AARZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | LEAD FREE, MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 391K |
| 代理商： | ADE7757AARZ |
Preliminary Technical Data
ADE7757A
Rev. PrE | Page 15 of 24
CONNECTING TO A MICROCONTROLLER FOR
ENERGY MEASUREMENT
The easiest way to interface the ADE7757A to a micro-
controller is to use the CF high frequency output with the
output frequency scaling set to 2048 × F1, F2. This is done
by setting SCF = 0 and S0 = S1 = 1 (see Table 7). With full-scale
ac signals on the analog inputs, the output frequency on CF is
approximately 2.867 kHz. Figure 26 illustrates one scheme that
could be used to digitize the output frequency and carry out the
necessary averaging mentioned in the previous section.
CF
TIME
±10%
FREQUENCY
RIPPLE
AVERAGE
FREQUENCY
ADE7757A
COUNTER
TIMER
MCU
CF
05330-016
Figure 26. Interfacing the ADE7757A to an MCU
As shown, the frequency output CF is connected to an MCU
counter or port. This counts the number of pulses in a given
integration time, which is determined by an MCU internal
timer. The average power proportional to the average frequency
is given by
Time
Counter
Power
Average
Frequency
Average
=
(8)
The energy consumed during an integration period is given by
)
9
(
Counter
Time
Counter
Time
Power
Average
Energy
=
×
=
×
=
For the purpose of calibration, this integration time could be
10 seconds to 20 seconds in order to accumulate enough pulses
to ensure correct averaging of the frequency. In normal
operation, the integration time could be reduced to one or two
seconds, depending, for example, on the required update rate of
a display. With shorter integration times on the MCU, the
amount of energy in each update may still have some small
amount of ripple, even under steady load conditions. However,
over a minute or more the measured energy has no ripple.
POWER MEASUREMENT CONSIDERATIONS
Calculating and displaying power information always has some
associated ripple that depends on the integration period used
in the MCU to determine average power and also on the load.
For example, at light loads, the output frequency may be 10 Hz.
With an integration period of two seconds, only about 20 pulses
are counted. The possibility of missing one pulse always exists,
because the output frequency of the ADE7757A is running
asynchronously to the MCU timer. This results in a 1-in-20 or
5% error in the power measurement.
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|---|---|
| ADE7757ARN | 制造商:Rochester Electronics LLC 功能描述:ENERGY METER IC W/INTEGRATED OSCILLATOR - Bulk 制造商:Analog Devices 功能描述:IC ENERGY METER |
| ADE7757ARN-REF | 制造商:Analog Devices 功能描述:REF BOARD ENERGY MTR W/INTGRATED OSCIL. - Rail/Tube |
| ADE7757ARNRL | 制造商:Analog Devices 功能描述:IC ENERGY METERING 16-SOIC TR |
| ADE7757ARNZ | 功能描述:IC ENERGY METERING 1PHASE 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
| ADE7757ARNZRL | 功能描述:IC ENERGY METERING 1PHASE 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
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