Manuali utente per STMicroelectronics Stepper motor driver mounting the L6474 in high power PowerSO package EVAL6474PD

Sommario

• Table 1. Device summary

  1
• 1 Block diagram

  7
  • Figure 1. Block diagram

    7
• 2 Electrical data

  8
  • 2.1 Absolute maximum ratings

    8
    • Table 2. Absolute maximum ratings

      8
  • 2.2 Recommended operating conditions

    9
    • Table 3. Recommended operating conditions

      9
  • 2.3 Thermal data

    9
    • Table 4. Thermal data

      9
• 3 Electrical characteristics

  10
  • Table 5. Electrical characteristics

    10
• 4 Pin connection

  15
  • Figure 2. HTSSOP28 pin connection (top view)

    15
  • Figure 3. POWERSO36 pin connection (top view)

    15
  • 4.1 Pin list

    16
    • Table 6. Pin description

      16
• 5 Typical applications

  18
  • Table 7. Typical application values

    18
  • Figure 4. Bipolar stepper motor control application using L6474

    18
• 6 Functional description

  19
  • 6.1 Device power-up

    19
  • 6.2 Logic I/O

    19
  • 6.3 Charge pump

    19
    • Figure 5. Charge pump circuitry

      20
  • 6.4 Microstepping

    20
    • Figure 6. Normal mode and microstepping (16 microsteps)

      20
  • 6.5 Absolute position counter

    21
  • 6.6 Step sequence control

    21
  • 6.7 Enable and disable commands

    21
  • 6.8 Internal oscillator and oscillator driver

    22
    • 6.8.1 Internal oscillator

      22
    • 6.8.2 External clock source

      22
      • Table 8. CL values according to external oscillator frequency

        22
      • Figure 7. OSCIN and OSCOUT pin configurations

        23
  • 6.9 Overcurrent detection

    23
  • 6.10 Undervoltage lock-out (UVLO)

    24
  • 6.11 Thermal warning and thermal shutdown

    24
  • 6.12 Reset and standby

    24
  • 6.13 Programmable DMOS slew-rate, dead-time and blanking-time

    25
  • 6.14 Integrated analog to digital converter

    25
  • 6.15 Internal voltage regulator

    25
    • Figure 8. Internal 3 V linear regulator

      25
  • 6.16 SYNC pin

    26
  • 6.17 FLAG pin

    26
• 7 Phase current control

  27
  • 7.1 Peak current control

    27
    • Figure 9. Peak current control

      27
  • 7.2 Auto-adjusted decay mode

    28
    • Figure 10. Adaptive decay - fast decay tuning

      28
    • Figure 11. Adaptive decay - switch from normal to slow+fast decay mode and vice versa

      29
  • 7.3 Auto-adjusted fast decay during the falling steps

    29
    • Figure 12. Fast decay tuning during the falling steps

      30
  • 7.4 Torque regulation (output current amplitude regulation)

    30
• 8 Serial interface

  31
  • Figure 13. SPI timings diagram

    31
  • Figure 14. Daisy-chain configuration

    32
• 9 Programming manual

  33
  • 9.1 Registers and flags description

    33
    • Table 9. Register map

      33
    • 9.1.1 ABS_POS

      34
    • 9.1.2 EL_POS

      34
      • Table 10. EL_POS register

        34
    • 9.1.3 MARK

      34
    • 9.1.4 TVAL

      34
      • Table 11. Torque regulation register

        35
    • 9.1.5 T_FAST

      35
      • Table 12. T_FAST register

        35
      • Table 13. Maximum fast decay times

        35
    • 9.1.6 TON_MIN

      35
      • Table 14. Minimum ON time

        36
    • 9.1.7 TOFF_MIN

      36
      • Table 15. Minimum OFF time

        36
    • 9.1.8 ADC_OUT

      37
      • Table 16. ADC_OUT value and torque regulation feature

        37
    • 9.1.9 OCD_TH

      37
      • Table 17. Overcurrent detection threshold

        37
    • 9.1.10 STEP_MODE

      38
      • Table 18. STEP_MODE register

        38
      • Table 19. Step mode selection

        38
      • Table 20. SYNC signal source

        39
    • 9.1.11 ALARM_EN

      40
      • Table 21. ALARM_EN register

        40
    • 9.1.12 CONFIG

      40
      • Table 22. CONFIG register

        40
      • Table 23. Oscillator management

        41
      • Table 24. Overcurrent event

        41
      • Table 25. Programmable power bridge output slew-rate values

        42
      • Table 26. External torque regulation enable

        42
      • Table 27. OFF time

        42
    • 9.1.13 STATUS

      42
      • Table 28. STATUS register

        42
      • Table 29. STATUS register DIR bit

        43
  • 9.2 Application commands

    43
    • Table 30. Application commands

      43
    • 9.2.1 Command management

      43
      • Figure 15. Command with three-byte argument

        44
      • Figure 16. Command with three-byte response

        44
      • Figure 17. Command response aborted

        44
    • 9.2.2 Nop

      44
      • Table 31. Nop command structure

        44
    • 9.2.3 SetParam (PARAM, VALUE)

      45
      • Table 32. SetParam command structure

        45
    • 9.2.4 GetParam (PARAM)

      45
      • Table 33. GetParam command structure

        45
    • 9.2.5 Enable

      46
      • Table 34. HardStop command structure

        46
    • 9.2.6 Disable

      46
      • Table 35. Disable command structure

        46
    • 9.2.7 GetStatus

      46
      • Table 36. GetStatus command structure

        46
• 10 Package mechanical data

  47
  • Table 37. HTSSOP28 mechanical data

    47
  • Figure 18. HTSSOP28 mechanical data

    48
  • Table 38. POWERSO36 mechanical data

    49
  • Figure 19. POWERSO36 drawings

    50
• 11 Revision history

  51
  • Table 39. Document revision history

    51