DSPIC33FJ128GP706A-E/MR Microchip Technology, DSPIC33FJ128GP706A-E/MR Datasheet - Page 23

• Manufacturer Part Number: DSPIC33FJ128GP706A-E/MR
• Description: 16 Bit MCU/DSP 40MIPS 128KB FLASH 64 QFN 9x9x0.9mm TUBE
• Manufacturer: Microchip Technology
• Series: dsPIC™ 33Fr

Specifications of DSPIC33FJ128GP706A-E/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 ~ 125°C
• Package / Case: 64-VFQFN, Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2009 Microchip Technology Inc.
2.4.1
The UART and SPI1 interfaces are multiplexed. Through the UART or SPI1 interface,
the host MCU can communicate with the metering front-end to perform calibration or
obtain metering results. The SPI interface may also be used if high-speed data transfer
is desired. In this case, the SPI interface of the dsPIC device works in the slave mode.
The UART and SPI1 share a common pin, so only one of the two interfaces can be
used at a time. Since the reference design uses a PC to simulate the host MCU, the
UART interface is chosen as the communication interface. SPI and RS232 interfaces
are not isolated from the PC. A general-purpose transceiver device, MAX232, is used
for the UART interface.
2.4.2
Three sets of outputs for energy measurement pulses are available in this design,
corresponding to the I/O pins of RD1-RD3. Two of them, output total active energy and
total reactive energy, respectively, and the other is not yet specified. Outputs are
isolated by a photo-electronic coupling device, U
active when corresponding I/O pin is high.
In addition, the design also provides two sets of LED outputs for energy meter calibra-
tion. The output pins for these LEDs are RC13 and RC14. The LED is on when the
output is low. Figure 2-4 is the circuit of energy pulse output interface.
FIGURE 2-4:
Energy Pulse Output Interface
RD3
RD1
UART and SPI1 Interface
RD2
RC13
RC14
Energy Output Pulse Configuration.
1 kΩ
R
1 kΩ
R
1 kΩ
R
301
301
301
R
470Ω
R
470Ω
314
310
Hardware Description
3.3V
3.3V
3
. The photo-electronic coupler is
D303
D302
Total Reactive
(not used)
Total Active
Total Reactive
Total Active
DS51723A-page 23