PIC12F1822T-I/SL 查看數據表（PDF） - Microchip Technology

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PIC12F1822T-I/SL

8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC12F/LF1822/16F/LF1823

23.4.1 HALF-BRIDGE MODE

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 inactive during the entire cycle. See

Section 23.4.5 “Programmable Dead-Band Delay

Mode” for more details of the dead-band delay

operations.

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:

EXAMPLE OF HALF-

BRIDGE PWM OUTPUT

Period

Period

P1A(2)

Pulse Width

td

td

P1B(2)

(1)

(1)

(1)

td = Dead-Band Delay

Note 1: At this time, the TMR2 register is equal to the

PR2 register.

2: Output signals are shown as active-high.

FIGURE 23-9:

EXAMPLE OF HALF-BRIDGE APPLICATIONS

Standard Half-Bridge Circuit (“Push-Pull”)

FET

Driver

+

P1A

-

FET

Driver

P1B

Load

+

-

Half-Bridge Output Driving a Full-Bridge Circuit

FET

Driver

P1A

FET

Driver

P1B

V+

Load

FET

Driver

FET

Driver

 2010 Microchip Technology Inc.

Preliminary

DS41413A-page 211

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