L9942 데이터 시트보기 (PDF) - STMicroelectronics

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L9942

Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile

STMicroelectronics 

L9942

Figure 15. Stall detection

Load Current Rising During High Speed

Counter value is above threshold value.

PWM activ detection

Stall

Time

Th r es h ol d

Register 5 Register 4 Reg3

16us * bit7 bit6 bit5 bit7 bit6 bit5 bit7 bit6

D7 D6 D5 D4 D3 D2 D1 D0

Time

PWM activ detection

PWM activ detection

Stall

Threshold

PWM activ

counter

Stall

Threshold

PWM activ

counter

No

Stall Signal

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Activ

sampling and

th r es h o ld

01 23 4 56 78 7 654 3 2101 2345 6787 6 543 2 1

Activ

sampling and

Current Driver A

threshold

Phase Counter

Adress of Current

Profile Entry

0 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Current Driver A

01 2345 6787 6 543 2 10 1 2345 6 78 76 54 32 1

Current Driver B

87 65 4 32 10 1 234 5 6787 6543 2101 2 345 6 7

Adress of Current

Profile Entry

Current Driver B

87 6543 2101 2 345 6 78 7 6543 2 10 12 34 56 7

STEP Signal

Micro Stepping Mode: DIR=0

Micro Stepping Mode: DIR=1

Load Current Rising During Low Speed or Stall

PWM activ detection

Time

Counter value is below threshold value.

PWM activ detection

PWM activ detection

PWM activ

Stall

counter

Threshold

PWM activ

counter

St al l

Threshold

Stall Signal

Stall Signal

Appendix

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Activ

sampling and

threshold

0 1 23 4 5 6 78 7 6 54 3 2 10 1 2 34 5 6 78 7 6 54 3 2 1

Activ

sampling and

Current Driver A

threshold

Phase Counter

Adress of Current

Profile Entry

0 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Current Driver A

0 1 2 34 5 6 78 7 6 54 3 2 1 01 2 3 45 6 7 87 6 5 43 2 1

Current Driver B

8 7 65 4 3 2 10 1 2 34 5 6 78 7 6 54 3 2 10 1 2 34 5 6 7

Adress of Current

Profile Entry

Current Driver B

8 7 6 54 3 2 10 1 2 34 5 6 7 87 6 5 43 2 1 01 2 3 45 6 7

STEP Signal

Micro Stepping Mode: DIR=0

Micro Stepping Mode: DIR=1

Doc ID 11778 Rev 7

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