DSPIC30F3010T-20I/SO Microchip Technology, DSPIC30F3010T-20I/SO Datasheet - Page 98

• Manufacturer Part Number: DSPIC30F3010T-20I/SO
• Description: IC DSPIC MCU/DSP 24K 28SOIC
• Manufacturer: Microchip Technology
• Series: dsPIC™ 30Fr

Specifications of DSPIC30F3010T-20I/SO

• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 20 MIPS
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, Motor Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 24KB (8K x 24)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

dsPIC30F3010/3011
15.7
Dead-time generation may be provided when any of
the PWM I/O pin pairs are operating in the Comple-
mentary Output mode. The PWM outputs use Push-
Pull drive circuits. Due to the inability of the power out-
put devices to switch instantaneously, some amount of
time must be provided between the turn-off event of
one PWM output in a complementary pair and the turn-
on event of the other transistor.
The PWM module allows two different dead-times to be
programmed. These two dead-times may be used in
one of two methods described below to increase user
flexibility:
• The PWM output signals can be optimized for
• The two dead-times can be assigned to individual
FIGURE 15-4:
DS70141B-page 96
different turn-off times in the high side and low
side transistors in a complementary pair of
transistors. The first dead-time is inserted
between the turn-off event of the lower transistor
of the complementary pair and the turn-on event
of the upper transistor. The second dead-time is
inserted between the turn-off event of the upper
transistor and the turn-on event of the lower
transistor.
PWM I/O pin pairs. This Operating mode allows
the PWM module to drive different transistor/load
combinations with each complementary PWM I/O
pin pair.
PWMxH
Dead-Time Generators
Duty Cycle Generator
PWMxL
DEAD-TIME TIMING DIAGRAM
Dead Time
Preliminary
15.7.1
Each complementary output pair for the PWM module
has a 6-bit down counter that is used to produce the
dead-time insertion. As shown in Figure 15-4, each
dead-time unit has a rising and falling edge detector
connected to the duty cycle comparison output.
15.7.2
The amount of dead time provided by the dead-time
unit is selected by specifying the input clock prescaler
value and a 6-bit unsigned value.
Four input clock prescaler selections have been pro-
vided to allow a suitable range of dead time, based on
the device operating frequency. The dead-time clock
prescaler values are selected using the DTAPS<1:0>
control bits in the DTCON1 SFR. One of four clock
prescaler options (T
selected.
After the prescaler value is selected, the dead time is
adjusted by loading 6-bit unsigned values into the
DTCON1 SFR.
The dead time unit prescaler is cleared on the following
events:
• On a load of the down timer due to a duty cycle
• On a write to the DTCON1 register.
• On any device Reset.
comparison edge event.
Note:
Dead Time
DEAD-TIME GENERATORS
DEAD-TIME RANGES
The user should not modify the DTCON1
value while the PWM module is operating
(PTEN = 1). Unexpected results may
occur.
CY
, 2T
© 2005 Microchip Technology Inc.
CY
, 4T
CY
or 8T
CY
) may be