PIC24FJ32GB002-I/SO Microchip Technology, PIC24FJ32GB002-I/SO Datasheet - Page 163

• Manufacturer Part Number: PIC24FJ32GB002-I/SO
• Description: IC MCU 16BIT 32KB FLASH 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 24Fr

Specifications of PIC24FJ32GB002-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 32KB (11K x 24)
• Package / Case: 28-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 16-Bit
• Speed: 32MHz
• Connectivity: I²C, IrDA, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 19
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC24FJ
• Core: PIC
• Data Bus Width: 16 bit
• Data Ram Size: 8 KB
• Interface Type: I2C/IrDA/SPI/UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 19
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, DM240001, MA240019, DM240002, DM240011, DV164033
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 9-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

14.3.1
The PWM period is specified by writing to PRy, the
Timer Period register. The PWM period can be
calculated using Equation 14-1.
EQUATION 14-1:
EQUATION 14-2:
EXAMPLE 14-1:
© 2009 Microchip Technology Inc.
1. Find the Timer Period register value for a desired PWM frequency of 52.08 kHz, where F
2.
PWM Period = [(PRy) + 1] • T
where:
Note 1:
Note 1:
Note:
device clock rate) and a Timer2 prescaler setting of 1:1.
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:
T
PWM Period = 1/PWM Frequency = 1/52.08 kHz = 19.2 μs
PWM Period = (PR2 + 1) • T
19.2 μs
PR2
PWM Resolution = log
PWM Frequency = 1/[PWM Period]
CY
PWM PERIOD
A PRy value of N will produce a PWM
period of N + 1 time base count cycles. For
example, a value of 7 written into the PRy
register will yield a period consisting of
8 time base cycles.
Based on T
and PLL are disabled.
Based on T
= 2 * T
OSC
Note 1: Based on F
Maximum PWM Resolution (bits) =
= (PR2 + 1) • 62.5 ns • 1
= 306
CALCULATING THE PWM
PERIOD
CALCULATION FOR MAXIMUM PWM RESOLUTION
PWM PERIOD AND DUTY CYCLE CALCULATIONS
CY
= 62.5 ns
CY
= (log
= 8.3 bits
= T
= 2 * T
CY
OSC
• (Timer Prescale Value)
10
(1)
10
OSC
(F
* 2, Doze mode
(16 MHz/52.08 kHz)/log
CY
CY
, Doze mode and PLL are disabled.
/F
• (Timer2 Prescale Value)
PWM
CY
= F
)/log
OSC
10
PIC24FJ64GB004 FAMILY
Preliminary
2) bits
/2, Doze mode and PLL are disabled.
log
10
10
2) bits
(
F
PWM
14.3.2
The PWM duty cycle is specified by writing to the
OCxRS and OCxR registers. The OCxRS and OCxR
registers can be written to at any time, but the duty
cycle value is not latched until a match between PRy
and TMRy occurs (i.e., the period is complete). This
provides a double buffer for the PWM duty cycle and is
essential for glitchless PWM operation.
Some important boundary parameters of the PWM duty
cycle include:
• If OCxR, OCxRS and PRy are all loaded with
• ·If OCxRS is greater than PRy, the pin will remain
See Example 14-1 for PWM mode timing details.
Table 14-1 and Table 14-2 show example PWM
frequencies and resolutions for a device operating at
4 MIPS and 10 MIPS, respectively.
0000h, the OCx pin will remain low (0% duty
cycle).
high (100% duty cycle).
• (Timer Prescale Value)
log
10
F
(2)
CY
PWM DUTY CYCLE
(1)
(1)
OSC
)
= 8 MHz with PLL (32 MHz
bits
DS39940C-page 161