PIC12F1822 MICROCHIP [Microchip Technology], PIC12F1822 Datasheet - Page 211
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PIC12F1822
Manufacturer Part Number
PIC12F1822
Description
8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC12F1822.pdf
(398 pages)
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23.4.1
In Half-Bridge mode, two pins are used as outputs to
drive push-pull loads. The PWM output signal is output
on the CCP1/P1A pin, while the complementary PWM
output signal is output on the P1B pin (see Figure 23-9).
This mode can be used for Half-Bridge applications, as
shown in Figure 23-9, or for Full-Bridge applications,
where four power switches are being modulated with
two PWM signals.
In Half-Bridge mode, the programmable dead-band delay
can be used to prevent shoot-through current in Half-
Bridge power devices. The value of the PDC<6:0> bits of
the PWM1CON register sets the number of instruction
cycles before the output is driven active. If the value is
greater than the duty cycle, the corresponding output
remains
Section 23.4.5 “Programmable Dead-Band Delay
Mode” for more details of the dead-band delay
operations.
FIGURE 23-9:
2010 Microchip Technology Inc.
Standard Half-Bridge Circuit (“Push-Pull”)
Half-Bridge Output Driving a Full-Bridge Circuit
inactive
HALF-BRIDGE MODE
during
EXAMPLE OF HALF-BRIDGE APPLICATIONS
the
P1A
P1B
entire
cycle.
P1A
P1B
FET
Driver
FET
Driver
PIC12F/LF1822/16F/LF1823
See
Preliminary
FET
Driver
FET
Driver
Since the P1A and P1B outputs are multiplexed with
the PORT data latches, the associated TRIS bits must
be cleared to configure P1A and P1B as outputs.
FIGURE 23-8:
P1A
P1B
td = Dead-Band Delay
Note 1: At this time, the TMR2 register is equal to the
Load
V+
(2)
(2)
2: Output signals are shown as active-high.
(1)
td
PR2 register.
Pulse Width
Load
Period
td
FET
Driver
FET
Driver
EXAMPLE OF HALF-
BRIDGE PWM OUTPUT
+
-
+
-
(1)
DS41413A-page 211
Period
(1)
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