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参数资料
| 型号： | ADE7878ACPZ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, QCC40 |
| 封装： | 6 X 6 MM, ROHS COMPLIANT, MO-220WJJD, LFCSP-40 |
| 文件页数： | 21/96页 |
| 文件大小： | 1096K |
| 代理商： | ADE7878ACPZ |
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ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 28 of 96
AIGAIN[23:0]
DSP
REFERENCE
HPFDIS
[23:0]
DIGITAL
INTEGRATOR
INTEN BIT
CONFIG[0]
TOTAL/FUNDAMENTAL
ACTIVE AND REACTIVE
POWER CALCULATION
CURRENT PEAK,
OVERCURRENT
DETECT
IAWV WAVEFORM
SAMPLE REGISTER
CURRENT RMS (IRMS)
CALCULATION
HPF
ADC
PGA1
IAP
ZX DETECTION
PGA1 BITS
GAIN[2:0]
×1, ×2, ×4, ×8, ×16
VIN
IAN
ANALOG INPUT RANGE
ANALOG OUTPUT RANGE
0x5A7540 =
+5,928,256
ZX SIGNAL
DATA RANGE
0V
0xA58AC0 =
–5,928,256
0x5A7540 =
+5,928,256
CURRENT CHANNE L
DATA RANGE AFTER
INTEGRATION
0V
0xA58AC0 =
–5,928,256
0x5A7540 =
+5,928,256
CURRENT CHANNEL
DATA RANGE
0V
0xA58AC0 =
–5,928,256
+0.5V/GAIN
–0.5V/GAIN
0V
LPF1
08
51
0-
0
19
Figure 31. Current Channel Signal Path
NIGAIN[23:0]
DSP
REFERENCE
DIGITAL
INTEGRATOR
INTEN BIT
CONFIG[0]
INWV WAVEFORM
SAMPLE REGISTER
CURRENT RMS (IRMS)
CALCULATION
HPF
ADC
PGA2
INP
PGA2 BITS
GAIN[5:3]
×1, ×2, ×4, ×8, ×16
VIN
INN
08
51
0-
12
0
Figure 32. Neutral Current Signal Path (ADE7868, ADE7878 Only)
Current Waveform Gain Registers
There is a multiplier in the signal path of each phase and
neutral current. The current waveform can be changed by
±100% by writing a corresponding twos complement number
to the 24-bit signed current waveform gain registers (AIGAIN,
BIGAIN, CIGAIN, and NIGAIN). For example, if 0x400000 is
written to those registers, the ADC output is scaled up by 50%.
To scale the input by 50%, write 0xC00000 to the registers.
Equation 3 describes mathematically the function of the current
waveform gain registers.
Current Waveform =
+
×
23
2
1
Register
Gain
Current
of
Content
Output
ADC
(3)
Changing the content of the AIGAIN, BIGAIN, CIGAIN, or
INGAIN registers affects all calculations based on its current;
that is, it affects the corresponding phase active/reactive/
apparent energy and current rms calculation. In addition,
waveform samples scale accordingly.
Note that the serial ports of the ADE7854, ADE7858, ADE7868,
and/or ADE7878 work on 32-, 16-, or 8-bit words, and the DSP
works on 28 bits. The 24-bit AIGAIN, BIGAIN, CIGAIN, and
NIGAIN registers are accessed as 32-bit registers with the four
most significant bits (MSBs) padded with 0s and sign extended
to 28 bits. See Figure 33 for details.
31
28 27
24 23
0
24-BIT NUMBER
0000
BITS[27:24] ARE
EQUAL TO BIT 23
BIT 23 IS A SIGN BIT
08
51
0-
01
6
Figure 33. 24-Bit xIGAIN Transmitted as 32-Bit Words
Current Channel HPF
The ADC outputs can contain a dc offset. This offset can create
errors in power and rms calculations. High-pass filters (HPFs)
are placed in the signal path of the phase and neutral currents
and of the phase voltages. If enabled, the HPF eliminates any dc
offset on the current channel. All filters are implemented in the
DSP and, by default, they are all enabled: the 24-bit HPFDIS
register is cleared to 0x00000000. All filters are disabled by
setting HPFDIS to any nonzero value.
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE78xx work on 32-, 16-, or 8-bit words.
The HPFDIS register is accessed as a 32-bit register with eight
MSBs padded with 0s. See Figure 34 for details.
31
24
23
0
24-BIT NUMBER
0000
08
51
0
-01
7
Figure 34. 24-Bit HPFDIS Register Transmitted as 32-Bit Word
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相关代理商/技术参数 |
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|---|---|
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| ADE7880 | 制造商:Analog Devices 功能描述:BOARD EVAL ENERGY METER ADE |
| ADE7880ACPZ | 功能描述:IC ENERGY METERING 3PH 40LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
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