DSPIC33FJ128GP706-I/PT Microchip Technology, DSPIC33FJ128GP706-I/PT Datasheet - Page 87

IC DSPIC MCU/DSP 128K 64TQFP

DSPIC33FJ128GP706-I/PT

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DSPIC33FJ128GP706-I/PT
Manufacturer:
MICROCHIP
Quantity:
150
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DSPIC33FJ128GP706-I/PT
Manufacturer:
Microchip Technology
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Part Number:
DSPIC33FJ128GP706-I/PT
Manufacturer:
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C.5
© 2009 Microchip Technology Inc.
MEASURING FREQUENCY
There are many ways to measure frequency, with the most common being counting the
signal cycle. In this method, a counter increments each time a zero-crossing is
detected. Based on the counts, the width of a cycle can be measured. If the zero-cross-
ing is accurate and the counter precision is high enough, cycle counting can be a
simple and practical method. But if the input signal has large harmonic components,
causing distortion around zero-crossing, then this approach may produce large errors.
Another method is to analyze and process the sampled data and calculate the frequen-
cies. Analysis may be carried out in time domain, such as digital differential ND and
interpolation method; or may be carried out in frequency domain after DFT transforma-
tion, such as gravity center method, spectrum zoom method and phase difference
method, among which the phase difference method is the most common one. It is not
sensitive to signal distortion around zero-crossing points.
The basic idea of the phase difference method is: if the rough range of to-be-measured
signal frequency is known, then we may assume a frequency that is close to the actual
frequency and then acquire an array of samples based on the assumed frequency. In
the sampled data, the phase of the 1st cycle and the subsequent N-th cycle are meau-
red and their difference may be calculated. Then the phase difference may be used to
calculate the difference between the actual freqency and the assumed frequence, thus
figuring out the actual frequency.
If the frequency f
Δf << f, then from Equation C-27, the fundamental signal can be expressed as:
EQUATION C-45:
If:
EQUATION C-46:
EQUATION C-47:
EQUATION C-48:
0
to be measured is known to be a definite value f, i.e., f
U
1
t ( )
u
u
a
b
=
=
=
=
=
u
-- -
T
2
2
-- -
T
c1
-- -
T
2
2
-- -
T
sin
T
0
T
0
T
0
T
0
U
U
u
u
(
c1
1
c1
1
ω
Power Calculation Theory
t ( )
t ( )
sin
sin
t
cos
sin
+
(
(
2
T
2
(
ϕ
(
π
π
ω
ω
u1
=
f
f
0
t
0
t
t
)
t
)
)
1
-- -
t d
f
t d
+
+
=
ϕ
ϕ
u
u1
u1
c1
)
)
cos
sin
sin
(
(
(
2
2
2
π
π
π
f
ft
ft
0
)
t
)
t d
t d
+
ϕ
u1
)
DS51723A-page 87
0
= f + Δf,

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