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| 型号： | ADE7953ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 23/72页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 1PH 28LFCSP |
| 标准包装： | 1 |
| 输入阻抗： | 660 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.4V |
| 电流 - 电源： | 6.8mA |
| 电源电压： | 3 V ~ 3.6 V |
| 测量仪表类型： | 单相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 28-LFCSP-WQ（5x5） |
| 包装： | 托盘 |
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Data Sheet
ROOT MEAN SQUARE MEASUREMENT
ADE7953
1
∫ f
RMS =
( t ) dt
1
∑ f 2 [ n ]
Root mean square (rms) is a measurement of the magnitude
of an ac signal. Specifically, the rms of an ac signal is equal to
the amount of dc required to produce an equivalent amount
of power in the load. The rms is expressed mathematically in
Equation 1.
t
2
t 0
For time-sampled signals, rms calculation involves squaring
the signal, taking the average, and obtaining the square root.
N
RMS =
N n = 1
As implied by Equation 2, the rms measurement contains
information from the fundamental and all harmonics over
a 1.23 kHz measurement bandwidth.
The ADE7953 provide rms measurements for Current
Channel A, Current Channel B, and the voltage channel
simultaneously. These measurements have a settling time of
approximately 200 ms and are updated at a rate of 6.99 kHz.
(1)
(2)
the IRMSA (Address 0x21A and Address 0x31A) and IRMSB
(Address 0x21B and Address 0x31B) registers, respectively. Both
of these registers are updated at a rate of 6.99 kHz. With full-
scale inputs on Current Channel A and Current Channel B,
the expected reading on the IRMSA and IRMSB register is
9032007d.
Because the LPF used in the rms signal path is not ideal, it is
recommended that the IRMSx registers be read synchronously
to the zero-crossing signal (see the Zero-Crossing Detection
section). This helps to stabilize reading-to-reading variation
by removing the effect of any 2ω ripple present on the rms
measurement.
VOLTAGE CHANNEL RMS CALCULATION
The ADE7953 provides an rms measurement on the voltage
channel. Figure 43 shows the signal path for this calculation.
VRMSOS[23:0]
2 12
√
X 2 VRMS[23:0]
FROM HPF
CURRENT CHANNEL RMS CALCULATION
The ADE7953 provides rms measurements for both Current
Channel A and Current Channel B. Figure 42 shows the signal
path for this calculation. The signal processing is identical for
Current Channel A and Current Channel B.
×IRMSOS[23:0]
2 12
CURRENT
VOLTAGE
SIGNAL
LPF
Figure 43. Voltage Channel RMS Signal Processing
As shown in Figure 43, the voltage channel ADC output
samples are used to continually compute the rms. The rms is
achieved by low-pass filtering the square of the output signal
and then taking a square root of the result. The 24-bit unsigned
voltage channel rms measurement is available in the VRMS
register (Address 0x21C and Address 0x31C). This register is
updated at a rate of 6.99 kHz. With full-scale inputs on the
SIGNAL
FROM HPF OR
INTEGRATOR
(IF ENABLED)
X 2
LPF
√
IRMSx[23:0]
voltage channel, a VRMS reading of 9032007d can be expected.
Because the LPF used in the rms signal path is not ideal, it is
Figure 42. Current Channel RMS Signal Processing
As shown in Figure 42, the current channel ADC output samples
are used to continually compute the rms. The rms is achieved by
low-pass filtering the square of the output signal and then taking
recommended that the VRMS register be read synchronously to
the zero-crossing signal (see the Zero-Crossing Detection section).
This helps to stabilize reading-to-reading variation by removing
the effect of any 2ω ripple present on the rms measurement.
a square root of the result. The 24-bit unsigned rms measurements
for Current Channel A and Current Channel B are available in
Rev. B | Page 23 of 72
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| ADE7953ACPZ-RL | 功能描述:IC ENERGY METERING 1PH 28LFCSP 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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