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| 型号： | MCP3905A-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 15/32页 |
| 文件大小： | 0K |
| 描述： | IC POWER METERING-1 PHASE 24SSOP |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 59 |
| 输入阻抗： | 390 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.85V |
| 电流 - 电源： | 2.7mA |
| 电源电压： | 4.5 V ~ 5.5 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： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 677 (CN2011-ZH PDF) |
| 配用： | MCP3905RD-PM1-ND - REFERENCE DESIGN FOR MCP3905 MCP3905EV-ND - BOARD DEMO FOR MCP3905 |
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MCP3905A/05L/06A
4.0
DEVICE OVERVIEW
The instantaneous power signal contains the real-
power information; it is the DC component of the
The MCP3905A/05L/06A devices are energy metering
ICs that supply a frequency output proportional to
active (real) power, and higher frequency output
proportional to the instantaneous power for meter
calibration. Both channels use 16-bit, second-order,
delta-sigma ADCs that oversample the input at a
frequency equal to MCLK/4, allowing for wide dynamic
range input signals. A Programmable Gain Amplifier
(PGA) increases the usable range on the current input
channel (Channel 0). The calculation of the active
power, and the filtering associated with this calculation
is performed in the digital domain, ensuring better
stability and drift performance. Figure 4-1 represents
the simplified block diagram of the
MCP3905A/05L/06A, detailing its main signal
processing blocks.
Two digital high-pass filters cancel the system offset on
both channels such that the real-power calculation
does not include any circuit or system offset. After
instantaneous power. The averaging technique can be
used with both sinusoidal and non-sinusoidal
waveforms, as well as for all power factors. The
instantaneous power is thus low-pass filtered in order
to produce the instantaneous real-power signal.
A digital-to-frequency converter accumulates the
instantaneous active real power information to produce
output pulses with a frequency proportional to the
average real power. The low-frequency pulses present
at the F OUT0 and F OUT1 outputs are designed to drive
electromechanical counters and two-phase stepper
motors displaying the real-power energy consumed.
Each pulse corresponds to a fixed quantity of real
energy, selected by the F2, F1 and F0 logic settings.
The HF OUT output has a higher frequency setting and
less integration period such that it can represent the
instantaneous real-power signal. Due to the shorter
accumulation time, it enables the user to proceed to
faster calibration under steady load conditions (see
being high-pass filtered, the voltage and current signals
are multiplied to give the instantaneous power signal.
Section 4.7 “F OUT0/1
Frequencies” ).
and HF OUT
Output
This signal does not contain the DC offset components,
such that the averaging technique can be efficiently
used to give the desired active-power output.
CH0+
CH0-
+
–
MCP390X
MCP3905
PGA
ADC
HPF
F OUT0
ANALOG
DIGITAL
X
LPF
.. 0 1 0 1 ...
DTF
F OUT1
HF OUT
CH1+
CH1-
+
–
Frequency
Content
ADC
HPF
0
Input Signal with
System Offset and
Line Frequency
0
ADC Output Code
Contains System
and ADC Offset
0
DC Offset
Removed by HPF
0
Instantaneous
Power
0
Instantaneous
Real Power
FIGURE 4-1:
Simplified MCP3905A/05L/06A Block Diagram with Frequency Contents.
? 2006-2011 Microchip Technology Inc.
DS22011B-page 15
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| MCP3905AT-E/SS | 功能描述:模数转换器 - ADC Energy Meter IC Gain 116 5001 Dynamic E RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3905AT-I/SS | 功能描述:模数转换器 - ADC Dynamic Range Energy Meter IC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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