DSPIC33FJ128GP706-I/PT Microchip Technology, DSPIC33FJ128GP706-I/PT Datasheet - Page 97

• Manufacturer Part Number: DSPIC33FJ128GP706-I/PT
• Description: IC DSPIC MCU/DSP 128K 64TQFP
• Manufacturer: Microchip Technology
• Series: dsPIC™ 33Fr

Specifications of DSPIC33FJ128GP706-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 128KB (128K x 8)
• Package / Case: 64-TFQFP
• 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
• 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
• Product: DSCs
• Data Bus Width: 16 bit
• Processor Series: DSPIC33F
• Core: dsPIC
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 85
• Data Ram Size: 16 KB
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Data Rom Size: 4096 B
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DM240001, DV164033
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM300024 - KIT DEMO DSPICDEM 1.1DV164033 - KIT START EXPLORER 16 MPLAB ICD2MA330012 - MODULE DSPIC33 100P TO 84QFPMA330011 - MODULE DSPIC33 100P TO 100QFPDM300019 - BOARD DEMO DSPICDEM 80L STARTERDM240001 - BOARD DEMO PIC24/DSPIC33/PIC32AC164327 - MODULE SKT FOR 64TQFPDV164005 - KIT ICD2 SIMPLE SUIT W/USB CABLE
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

C.15 RATIO ERROR COMPENSATION
© 2009 Microchip Technology Inc.
As non-linearity and inconsistency exist in the sampling circuit (including CT and
back-end shunt resistors) and the ADC circuit, it is necessary to compensate for ratio
error to the system. Figure C-9 is the transfer link of the voltage and current channels.
The compensation for ratio error is quite simple. It compares the measured value
against the actual input value under certain input conditions and obtains a correction
coefficient.
EQUATION C-65:
FIGURE C-9:
Since current has a large dynamic range, for a meter which requires high accuracy
(0.2s and 0.5s), the multi-point calibration method is needed to meet input requirement
for full range. The MCP3909 device's current channel includes an adjustable gain
amplifier. The ratio error must be recalibrated for different amplification, but only needs
to be calibrated once under the same amplification conditions.
Voltage
Current
Correction coefficient
Input
Input
Error Caused By Sampling Circuit And ADC.
Sampling resistor
Voltage primary
R0
=
Coefficient before correction
Power Calculation Theory
2000:1
CT
1:1
CT
Voltage secondary
Current secondary
Sampling resistor
Sampling resistor
×
Calibration Value
------------------------------------------ -
Measured Value
ADC
ADC
DS51723A-page 97