MCP3909RD-3PH3 Microchip Technology, MCP3909RD-3PH3 Datasheet - Page 63

• Manufacturer Part Number: MCP3909RD-3PH3
• Description: REF DESIGN FOR MCP3909 W/18F2520
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-3PH3

• Main Purpose: Power Management, Energy/Power Meter
• Utilized Ic / Part: MCP3909, PIC18F2520, PIC18F4550
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

6.5
6.6
6.7
© 2008 Microchip Technology Inc.
CALIBRATION ICONS
REGISTER LIST
WRITING TO INDIVIDUAL REGISTERS
The results frame contains small symbols that represent if a given calibration STEP has
occurred, and a given calibration register has been written, or not.
There are 5 symbols for total that represent the steps of calibration.
The status of these symbols (enabled / disabled) are saved in the PH_Y_CAL_STATUS
registers and is loaded when the software detects a meter connected to the PC. A
yellow icon represents that a given step HAS OCCURED.
It should be noted that the CF icon can only be enabled in 1 of the 3 phases. This is
because only 1 phase can be selected as the ‘standard phase’, and the other phases
must then be gained matched to this standard phase. For this reason you will note that
the gain icons for active power and apparent power ‘G’ are disabled in the standard
phase by turning a dark grey color.
For more information on the various steps of calibration, refer to Chapter 5. “Meter
Calibration”.
The results screen also includes a complete list of the registers, their address, name,
width, state (readable (R) or readable and writable (R/W)), value, description, and if
they have been selected for monitor refresh.
Unless they have been selected to be monitored, the registers in this frame are NOT
updated every 2.5 seconds like the meter reading section. To refresh the complete
register list, select “Refresh” from the menu.
To select a specific register for monitor, right click on the row in this frame and then
select “monitor” from the menu by left-clicking.
While not recommended as it will interfere with the calibration process, it is possible to
write to individual registers. All writes to registers is automated during the calibration
process, and it should not be necessary to write to a specific register to calibrate a
meter. However you can perform writes to your meter and test various configurations
by writing to the registers individually.
To write a value to a specific register, right click on the register and then select “write
value” on the menu by left clicking. At this point, you will be asked the value to be
written to the meter.
• CF for standard phase calibration
• φ - Phase delay
• O - Offset
• G - Gain
• L - GLSB
3-Phase Energy Meter Calibration Software
DS51643B-page 59