PIC16F716 datasheet(45/126 Pages) MICROCHIP

45 / 126 page

 2003 Microchip Technology Inc.

Preliminary

DS41206A-page 43

PIC16F716

7.4.3

FULL-BRIDGE MODE

In Full-Bridge Output mode, four pins are used as

outputs; however, only two outputs are active at a time.

the

Forward

mode,

RB3/CCP1/P1A

continuously active, and pin RB7/P1D is modulated. In

the Reverse mode, RB6/P1C pin is continuously active,

and RB5/P1B pin is modulated. These are illustrated in

Figure 7-6 through Figure 7-9.

P1A, P1B, P1C and P1D outputs are multiplexed with

the PORTB<3> and PORTB<5:7> data latches. The

TRISB<3> and TRISB<5:7> bits must be cleared to

make the P1A, P1B, P1C, and P1D pins output.

FIGURE 7-12:

EXAMPLE OF FULL-BRIDGE APPLICATION

7.4.3.1

Direction Change in Full-Bridge

Mode

In the Full-Bridge Output mode, the P1M1 bit in the

CCP1CON register allows the user to control the

Forward/Reverse direction. When the application

firmware changes this direction control bit, the module

will assume the new direction on the next PWM cycle.

Just before the end of the current PWM period, the

modulated outputs (P1B and P1D) are placed in their

inactive state, while the unmodulated outputs (P1A and

P1C) are switched to drive in the opposite direction. This

occurs in a time interval of (4

•TOSC•(Timer2 Prescale

value)) before the next PWM period begins. The Timer2

prescaler will be either 1, 4 or 16, depending on the

value of the T2CKPSx bits (T2CON<1:0>). During the

interval from the switch of the unmodulated outputs to

the beginning of the next period, the modulated outputs

(P1B and P1D) remain inactive. This relationship is

shown in Figure 7-13.

PIC16F716

P1A

P1C

FET

Driver

FET

Driver

V+

V-

Load

FET

Driver

FET

Driver

P1B

P1D

Note:

In the Full-Bridge Output mode, the ECCP

module does not provide any dead-band

delay. In general, since only one output is

modulated at all times, dead-band delay is

not required. However, there is a situation

where a dead-band delay might be

required. This situation occurs when both

of the following conditions are true:

1. The direction of the PWM output

changes when the duty cycle of the

output is at or near 100%.

2. The turn off time of the power switch,

including the power device and driver

circuit, is greater than the turn on

time.

PIC16F716 Datasheet(PDF) 45 Page - Microchip Technology

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