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AN4013

Advanced features for motor control

For more details on using the timer in this mode, refer to the examples provided in the

STM32F30x standard peripheral libraries, in the

/Project/STM32F30x_StdPeriph_Examples/ TIM/Combined folders.

STM32Cube F3 firmware package includes examples in the following directories:



Projects\STM32F3-Discovery\Examples\TIM\TIM_Combined,



Projects\STM32303E_EVAL\Examples\TIM\TIM_Combined,



Projects\STM32303C_EVAL\Examples\TIM\TIM_Combined.

4.3

Specific features for motor control applications

4.3.1

Complementary signal and dead time feature

STM32xx advanced timers can generate up to three complementary outputs with insertion

of dead time.

To use the complementary signal for one channel, set the two output compare enable bits of

this channel and its complementary (OCxE and OCxNE) channel.If the dead time bits are

different from zero, the two signals are generated with insertion of a dead time as illustrated

in Figure 6: Two signals are generated with insertion of a dead time:

Figure 6. Two signals are generated with insertion of a dead time

The dead time parameter is computed using the DTG[7:0] bits and the dead time clock

(Tdtg).

The dead time clock is computed as follows:

Tdtg = TDTS,

if DTG[7] = 0

Tdtg = 2 x TDTS,

if DTG[6] = 0

Tdtg = 8 x TDTS,

if DTG[5] = 0

Tdtg = 16 x TDTS, if DTG[7:5] = 111

Note:

TCK_INT is the timer internal clock.

Where: TDTS = TCK_INT, if CKD[1:0] = 00

TDTS = 2 x TCK_INT, if CKD[1:0] = 01

TDTS = 4 x TCK_INT, if CKD[1:0] = 10

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