POWERSTEP01 datasheet(69/92 Pages) STMICROELECTRONICS

69 / 92 page

DocID025022 Rev 5

69/92

powerSTEP01

Programming manual

When the device operates in voltage mode, the F_PWM_DEC bits set the multiplication

factor of PWM frequency generation:

In the following tables all available PWM frequencies are listed according to oscillator

frequency, F_PWM_INT and F_PWM_DEC values (CONFIG register OSC_SEL parameter

has to be correctly programmed).

Table 48. PWM frequency: multiplication factor

F_PWM_DEC [2 … 0]

Multiplication factor

0.625

0.75

0.875

1.25

1.5

1.75

Table 49. Available PWM frequencies [kHz]: 8 MHz oscillator frequency

F_PWM_DEC

F_PWM_INT

000

001

010

011

100

101

110

111

000

9.8

11.7

13.7

15.6

19.5

23.4

27.3

31.3

001

4.9

5.9

6.8

7.8

9.8

11.7

13.7

15.6

010

3.3

3.9

4.6

5.2

6.5

7.8

9.1

10.4

011

2.4

2.9

3.4

3.9

4.9

5.9

6.8

7.8

100

2.0

2.3

2.7

3.1

3.9

4.7

5.5

6.3

101

1.6

2.0

2.3

2.6

3.3

3.9

4.6

5.2

110

1.4

1.7

2.0

2.2

2.8

3.3

3.9

4.5

Table 50. Available PWM frequencies [kHz]: 16 MHz oscillator frequency

F_PWM_DEC

F_PWM_INT

000

001

010

011

100

101

110

111

000

19.5

23.4

27.3

31.3

39.1

46.9

54.7

62.5

001

9.8

11.7

13.7

15.6

19.5

23.4

27.3

31.3

010

6.5

7.8

9.1

10.4

13.0

15.6

18.2

20.8

011

4.9

5.9

6.8

7.8

9.8

11.7

13.7

15.6

100

3.9

4.7

5.5

6.3

7.8

9.4

10.9

12.5

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