DSPIC33FJ128GP706A-I/MR Microchip Technology, DSPIC33FJ128GP706A-I/MR Datasheet - Page 40

IC DSPIC MCU/DSP 128K 64-QFN

DSPIC33FJ128GP706A-I/MR

Manufacturer Part Number
DSPIC33FJ128GP706A-I/MR
Description
IC DSPIC MCU/DSP 128K 64-QFN
Manufacturer
Microchip Technology
Series
dsPIC™ 33Fr

Specifications of DSPIC33FJ128GP706A-I/MR

Core Processor
dsPIC
Core Size
16-Bit
Speed
40 MIPs
Connectivity
CAN, I²C, IrDA, LIN, SPI, UART/USART
Peripherals
AC'97, Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 18x10b/12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VFQFN, Exposed Pad
Product
DSCs
Processor Series
DSPIC33F
Core
dsPIC
3rd Party Development Tools
52713-733, 52714-737, 53276-922, EWDSPIC
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, DM240001, DV164033
Core Frequency
40MHz
Core Supply Voltage
3.3V
Embedded Interface Type
I2C, SPI, UART
No. Of I/o's
53
Flash Memory Size
128KB
Supply Voltage Range
3V To 3.6V
Rohs Compliant
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
MCP3909 / dsPIC33F 3-Phase Energy Meter Reference Design
4.3
DS51723A-page 40
APPARENT POWER CALIBRATION
4.2.1
The process of calibration is as follows:
1. Supply the meter with balanced load, PF = 1.0, V
2. Load the dsPIC33F with the proper correction factors. Automatically done using
Repeat these following steps for the second point at 10% IB:
1.
2. Load the dsPIC33F with the proper correction factors. Automatically done using
If accuracy is not critical, the single-point calibration method can be used. The number
of calibration points can be defined in the header file of the program.
Apparent Power calibration function is implemented by the upper computer by sending
the commands. Before the power calibration process can be entered, power calibration
mode command needs to be sent first. The error data of the calibration workbench and
channel information to be calibrated are sent to the metering front-end. When the
front-end receives the command, it calls this module. The flow is as follows:
1. Determine the phase to be calibrated according to the parameters received.
2. Calculate new power calibration coefficient according to the error value received
3. Store the coefficient after correction into the EEPROM.
4.3.1
The process of calibration is as follows:
1. Set the input condition as: Phase A PF = 1.0, V
2. Choose the energy pulse output to be the apparent power output mode Refer to
3. Load the dsPIC33F with the proper correction factors. This is automatically done
4.
5. Repeat the above steps for Phases B and C.
Note:
the PC software. See Chapter 5. “PC Software”.
Set the three-phase balance input conditions
500 mA.
the PC software. See Chapter 5. “PC Software”.
and the measured value, together with the original power calibration coefficient.
current when region N is being calibrated, the voltage and current inputs of phase
B and C are zero.
Chapter 6. “Meter Communications Protocol”. At this time, the energy pulse
is the accumulated multiplication of power and time.
using PC software. See Chapter 5. “PC Software”.
Repeat steps 1 - 3 for phase lag calibrations for all current regions of phase A.
Current/Voltage Calibration Process
Apparent Power Calibration Process
At this time, the phase lag has not been calibrated, so when the input
PF = 1.0, the measured value of the reactive power isn't equal to zero.
PF = 1.0, V
CAL
CAL
= 220V, input current is the
CAL
= 220V, I
© 2009 Microchip Technology Inc.
= 220V, I
B
= 5A.
CAL
= 0.1 I
B
or

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