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DSPIC33FJ12GP201TE/ML Datasheet(PDF) 133 Page - Microchip Technology

Part # DSPIC33FJ12GP201TE/ML
Description  High-Performance, 16-Bit Digital Signal Controllers
PDF  242 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DSPIC33FJ12GP201TE/ML Datasheet(HTML) 133 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
Preliminary
DS70264B-page 131
dsPIC33FJ12GP201/202
EXAMPLE 13-1:
PWM PERIOD AND DUTY CYCLE CALCULATIONS
TABLE 13-1:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 4 MIPS (FCY = 4 MHz)
TABLE 13-2:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 16 MIPS (FCY = 16 MHz)
TABLE 13-3:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MIPS (FCY = 40 MHz)
PWM Frequency
7.6 Hz
61 Hz
122 Hz
977 Hz
3.9 kHz
31.3 kHz
125 kHz
Timer Prescaler Ratio
8
1
111
11
Period Register Value
FFFFh
FFFFh
7FFFh
0FFFh
03FFh
007Fh
001Fh
Resolution (bits)
16
16
15
12
10
7
5
PWM Frequency
30.5 Hz
244 Hz
488 Hz
3.9 kHz
15.6 kHz
125 kHz
500 kHz
Timer Prescaler Ratio
8
1
111
11
Period Register Value
FFFFh
FFFFh
7FFFh
0FFFh
03FFh
007Fh
001Fh
Resolution (bits)
16
16
15
12
10
7
5
PWM Frequency
76 Hz
610 Hz
1.22 Hz
9.77 kHz
39 kHz
313 kHz
1.25 MHz
Timer Prescaler Ratio
8
1
111
11
Period Register Value
FFFFh
FFFFh
7FFFh
0FFFh
03FFh
007Fh
001Fh
Resolution (bits)
16
16
15
12
10
7
5
1.
Find the Timer Period register value for a desired PWM frequency that is 52.08 kHz, where FCY = 16 MHz and a Timer2
prescaler setting of 1:1.
TCY
= 62.5 ns
PWM Period = 1/PWM Frequency = 1/52.08 kHz = 19.2 ms
PWM Period = (PR2 + 1) • TCY • (Timer2 Prescale Value)
19.2 ms
= (PR2 + 1) • 62.5 ns • 1
PR2
= 306
2.
Find the maximum resolution of the duty cycle that can be used with a 52.08 kHz frequency and a 32 MHz device clock rate:
PWM Resolution
= log10(FCY/FPWM)/log102) bits
=(log10(16 MHz/52.08 kHz)/log102) bits
= 8.3 bits



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