Stepper Motor Driver for Bipolar Motors with microstepping & programmable current profile

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  • The L9942 is an integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile look-up-table to allow a flexible adaptation of the stepper motor characteristics and intended operating conditions. It is possible to use different current profiles depending on target criteria: audible noise, vibrations, rotation speed or torque. The decay mode used in PWM-current control circuit can be programmed to slow-, fast-, mixed-and auto-decay. In autodecay mode device will use slow decay mode if the current for the next step will increase and the fast decay or mixed decay mode if the current will decrease. The programmable stall detection is useful in case of head lamp leveling and bending light application, by preventing to run the motor too long time in stall for position alignment. If a stall is detected, the alignment process is closed and the noise is minimized.

    Key Features

    • Two full bridges for max. 1.3 A load(RDSON= 500 mΩ)
    • Programmable current waveform with look-up table: 9 entries with 5 bit resolution
    • Current regulation by integrated PWM controller and internal current sensing
    • Programmable stepping mode: full, half, mini and microstepping
    • Programmable slew rate for EMC and power dissipation optimization
    • Programmable Fast-, Slow-, Mixed- and Auto-Decay Mode
    • Full-scale current programmable with 3 bit resolution
    • Programmable stall detection
    • Step clock input for reduced μController requirements
    • Very low current consumption in standby mode IS< 3 μA, typ. Tj≤ 85 °C
    • All outputs short circuit protected with openload, overload current, temperature warning and thermal shutdown
    • The PWM signal of the internal PWM controller is available as digital output.
    • All parameters are guaranteed for 3 V < Vcc < 5.3 V and for 7 V < Vs < 20 V

Circuit Diagram

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max
L9942XP1TR PowerSSO 24 Tape And Reel - -
Active
2.3 1000 EAR99
MORE INFO

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofL9942XP1TR

Distributor Name
Region Stock Min. Order Third party link
AVNET AMERICA 1000 0 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 925 1 Order Now
Farnell Element14 EUROPE 977 1 Order Now

Distributor reported inventory date: 2019-10-21

Distributor Name

AVNET

Stock

1000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

925

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

977

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-10-21

Get sample
L9942XP1 PowerSSO 24 Tube - -
Active
2.3 1000 EAR99
MORE INFO

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofL9942XP1

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 1225 1 Order Now

Distributor reported inventory date: 2019-10-21

Distributor Name

MOUSER

Stock

1225

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-10-21

Get sample

L9942XP1TR

Package

PowerSSO 24

Packing Type

Tape And Reel

Unit Price (US$)

2.3*

Distributor availability ofL9942XP1TR

Distributor Name
Region Stock Min. Order Third party link
AVNET AMERICA 1000 0 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 925 1 Order Now
Farnell Element14 EUROPE 977 1 Order Now

Distributor reported inventory date: 2019-10-21

Distributor Name

AVNET

Stock

1000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

925

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

977

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-10-21

Operating Temperature (°C)

(min)

-

(max)

-

Marketing Status

Active

Unit Price (US$)

2.3

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L9942XP1

Package

PowerSSO 24

Packing Type

Tube

Unit Price (US$)

2.3*

Distributor availability ofL9942XP1

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 1225 1 Order Now

Distributor reported inventory date: 2019-10-21

Distributor Name

MOUSER

Stock

1225

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-10-21

Operating Temperature (°C)

(min)

-

(max)

-

Marketing Status

Active

Unit Price (US$)

2.3

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Evaluation Tools

    • Part Number

      Evaluation board for L9942XP microstepping fully integrated motor driver

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS4480
      Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile
      7.0
      518.94 KB
      PDF
      DS4480

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

    • Description Version Size Action
      AN3327
      L9942 back EMF stall detection algorithm
      3.0
      761.83 KB
      PDF
      AN2650
      L9942 stepper motor driver for bipolar stepper motors
      3.1
      641.77 KB
      PDF
      AN3327

      L9942 back EMF stall detection algorithm

      AN2650

      L9942 stepper motor driver for bipolar stepper motors

    • Description Version Size Action
      TA0354
      Thermal design calculations for integrated stepper motor driver solutions
      1.0
      266.59 KB
      PDF
      TA0354

      Thermal design calculations for integrated stepper motor driver solutions

    • Description Version Size Action
      UM0839
      ST L9942 evaluation board
      2.0
      816.91 KB
      PDF
      UM0839

      ST L9942 evaluation board

Publications and Collaterals

    • Description Version Size Action
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      838.51 KB
      PDF
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      3.38 MB
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      Automotive powertrain and safety ICs

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    • Description Version Size Action
      ST’s solutions for automotive seating systems 1.0
      1.3 MB
      PDF

      ST’s solutions for automotive seating systems

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L9942XP1
Active
PowerSSO 24 Automotive Ecopack2
L9942XP1TR
Active
PowerSSO 24 Automotive Ecopack2

L9942XP1

Package:

PowerSSO 24

Material Declaration**:

PDF

Marketing Status

Active

Package

PowerSSO 24

Grade

Automotive

RoHS Compliance Grade

Ecopack2

L9942XP1TR

Package:

PowerSSO 24

Material Declaration**:

PDF

Marketing Status

Active

Package

PowerSSO 24

Grade

Automotive

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.