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MCP3909T-I/SS датащи(PDF) 35 Page - Microchip Technology

номер детали MCP3909T-I/SS
подробное описание детали  Energy Metering IC with SPI Interface and Active Power Pulse Output
PDF  44 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3909T-I/SS датащи(HTML) 35 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS22025B-page 35
MCP3909
FIGURE 6-3:
Simplified MCU Based Energy Meter.
6.3
Meter Calibration
To achieve meter calibration the MCP3909 waveform
samples are adjusted during the power calculations on
the PIC MCU. In Figure 6-3, this interface is shown via
RS-232 on the PIC microcontroller. This process is
streamlined using calibration software available from
Microchip’s web site.
6.4
Analog Meter Design Tips
For analog design tips and PCB layout recommenda-
tions, refer to AN994, "IEC Compliant Active Energy
Meter Design Using The MCP390X” (DS00994). This
application note includes all required energy meter
design information, including the following:
• Meter rating and current sense choices
• Shunt design
• PGA selection
• F2, F1, F0 selection
• Meter calibration
• Anti-aliasing filter design
• Compensation for parasitic shunt inductance
•EMC design
• Power supply design
• No-Load threshold
• Start-up current
• Accuracy Testing Results from MCP390X-based
meter
• EMC Testing Results from MCP390X-based
meter
N
L
SCK
SDI
SDO
CS
CLKIN
CH0+
CH0-
CH1+
CH1-
AVDD,DVDD
AGND,DGND
MCP3909
RC3/SCK
RC5/SDO
RC4/SDI
RA0/ANO
GND
RC1/CCP2
RX/RC6
TX/RC7
...
LCD
kW
kWhr
kVAhr
A
V
PHA_W:16
ENERGY_W:64
ENERGY_VA_GLSB:16
PHA_I_RMS:16
PHA_V_RMS:16
RS-232
To PC or
Calibration
Equipment
OSC1
OSC2
Resistor Divider
Power Supply
Circuitry



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