MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 27

• Manufacturer Part Number: MCP3909RD-1PH1
• Description: BOARD DES MCP3909 ENERGY METER
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-1PH1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP3909, PIC18F85J90
• Primary Attributes: Single Phase Shunt Energy Meter
• Secondary Attributes: 16 Bit ADC
• Ic Function: Single Phase Energy Measurement IC
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 24
• Interface Type: SPI
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
© 2009 Microchip Technology Inc.
CALIBRATION REGISTERS
PHA_DELAY
PHA_W_OFF
PHA_W_GAIN
PHA_W_GLSB
PHA_VAR_GAIN (NOT IMPLEMENTED)
PHA_VAR_GLSB (NOT IMPLEMENTED)
The calibration register set contains all of the offset, gain, LSB adjust, phase delay, and
calibration output pulse adjustment settings. The values to be placed in these
configuration registers come during meter calibration and can be automatically
generated using the “3-Phase Meter Calibration Software” available for download on
Microchip’s website.
REGISTER 3-14:
Phase A delay, signed 8-bit value, ±2.8125 degrees
(±130 µs for 60 Hz, ±156 µs for 50 Hz)
REGISTER 3-15:
Phase A active power offset (this is straight offset, not the square as with voltage and
current). A much larger value is need because the power is a running sum. This is a
32-bit signed value.
REGISTER 3-16:
Phase A active power gain so that all results can be calibrated to produce equal CF
pulses/watt-hour. The signed 16-bit number produces a change in the PHA_W_RAW
value before being added to the energy registers. A value of 32,767 represents a
99.9939% increase while a value of 8192 represents a decrease of 50%.
REGISTER 3-17:
Phase A active power gain to produce X W/LSB. The value is always less than one (for
example, 32,767 = 0.9999695).
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
PHA_DELAY
PHA_W_GLSB
PHA_W_GAIN
PHA_W_OFF
Name
Name
Name
Name
Calculation and Register Description
PHA_W_GLSB REGISTER
PHA_DELAY REGISTER
PHA_W_OFF REGISTER
PHA_W_GAIN REGISTER
Bit
8
Bits
Bits
Bits
32
16
16
Address
0x140
Address
Address
Address
0x17C
0x170
0x182
R/W
Cof
R/W
R/W
R/W
Cof
Cof
Cof
DS51884A-page 27