PIC18F4431-E/P Microchip Technology, PIC18F4431-E/P Datasheet - Page 193

• Manufacturer Part Number: PIC18F4431-E/P
• Description: IC MCU FLASH 8KX16 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/P

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: EUSART, I2C, SPI, SSP
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 1 x 8
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 9 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DVA18XP400 - DEVICE ADAPTER 18F4220 PDIP 40LDACICE0206 - ADAPTER MPLABICE 40P 600 MIL
• Lead Free Status / Rohs Status: Details

The actual dead time is calculated from the DTCON
register as follows:
Dead Time = Dead-Time Value/(F
Table 18-3
function of the input clock prescaler selected and the
device operating frequency.
TABLE 18-3:
 2010 Microchip Technology Inc.
(MHz)
F
OSC
40
40
40
40
32
32
32
32
25
25
25
25
20
20
20
20
10
10
10
10
5
5
5
5
4
4
4
4
MIPS
6.25
6.25
6.25
6.25
1.25
1.25
1.25
1.25
2.5
2.5
2.5
2.5
10
10
10
10
8
8
8
8
5
5
5
5
1
1
1
1
shows example dead-time ranges as a
Prescaler
Selection
F
F
F
F
F
F
F
EXAMPLE DEAD-TIME
RANGES
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
OSC
/16
/16
/16
/16
/16
/16
/16
/2
/4
/8
/2
/4
/8
/2
/4
/8
/2
/4
/8
/2
/4
/8
/2
/4
/8
/2
/4
/8
Dead-Time
62.5 ns
100 ns
200 ns
400 ns
125 ns
250 ns
500 ns
160 ns
320 ns
640 ns
100 ns
200 ns
400 ns
800 ns
200 ns
400 ns
800 ns
400 ns
800 ns
1.6 s
1.6 s
3.2 s
0.5 s
50 ns
80 ns
1 s
2 s
4 s
Min
OSC
/Prescaler)
Dead-Time
102.4 s
102.4 s
204.8 s
12.8 s
25.6 s
5.12 s
10.2 s
20.5 s
12.8 s
25.6 s
51.2 s
12.8 s
25.6 s
51.2 s
25.6 s
51.2 s
128 s
256 s
3.2 s
6.4 s
6.4 s
32 s
41 s
PIC18F2331/2431/4331/4431
16 s
32 s
64 s
Max
4 s
8 s
18.7.4
18.8
Independent PWM mode is used for driving the loads
(as shown in
switched reluctance motor. A particular PWM output
pair is configured in the Independent Output mode
when the corresponding PMOD bit in the PWMCON0
register is set. No dead-time control is implemented
between the PWM I/O pins when the module is operat-
ing in the Independent PWM mode and both I/O pins
are allowed to be active simultaneously. This mode can
also be used to drive stepper motors.
18.8.1
In the Independent PWM mode, each duty cycle gener-
ator is connected to both PWM output pins in a given
PWM output pair. The odd and even PWM output pins
are driven with a single PWM duty cycle generator.
PWM1 and PWM0 are driven by the PWM channel
which uses the PDC0 register to set the duty cycle,
PWM3 and PWM2 with PDC1, PWM5 and PWM4 with
PDC2, and PWM7 and PWM6 with PDC3 (see
Figure 18-3
Note 1: For small PWM duty cycles, the ratio of
2: Changing
Independent PWM Output
DEAD-TIME DISTORTION
DUTY CYCLE ASSIGNMENT IN THE
INDEPENDENT PWM MODE
and
dead time to the active PWM time may
become large. In this case, the inserted
dead time will introduce distortion into
waveforms produced by the PWM
module. The user can ensure that
dead-time distortion is minimized by
keeping the PWM duty cycle at least
three times larger than the dead time. A
similar effect occurs for duty cycles at or
near 100%. The maximum duty cycle
used in the application should be chosen
such that the minimum inactive time of
the signal is at least three times larger
than the dead time. If the dead time is
greater or equal to the duty cycle of one
of the PWM output pairs, then that PWM
pair will be inactive for the whole period.
DTCON when the PWM is enabled may
result in an undesired situation. Disable
the PWM (PTEN = 0) before changing
the dead-time value
Figure
Register
18-19) for driving one winding of a
the
18-4).
dead-time
DS39616D-page 193
values
in