L9942:Stepper Motor Driver for Bipolar Motors with microstepping & programmable current profile

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
Product Specifications
DescriptionVersionSize
DS4480: Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile7.0518 KB
Application Notes
DescriptionVersionSize
AN3327: L9942 back EMF stall detection algorithm3.0761 KB
AN2650: L9942 stepper motor driver for bipolar stepper motors3.1673 KB
Technical Notes & Articles
DescriptionVersionSize
TA0354: Thermal design calculations for integrated stepper motor driver solutions1.0266 KB
User Manuals
DescriptionVersionSize
UM0839: ST L9942 evaluation board2.0816 KB
Selection Guides
DescriptionVersionSize
Automotive powertrain and safety ICs1.0838 KB
Smart power solutions for car body applications3.01 MB
Product Evaluation Tools
Part NumberManufacturerDescription
EVAL-L9942Evaluation board for L9942XP microstepping fully integrated motor driver
Sample & Buy
Part NumberPackagePacking TypeOperating Temperature (°C) (min)Operating Temperature (°C) (max)Unit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
L9942XP1TRPowerSSO 24Tape And Reel----NECEAR99MALAYSIA
L9942XP1PowerSSO 24Tube----NECEAR99MALAYSIA
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
L9942XP1TRPowerSSO 24AutomotiveEcopack2ipc1752_grv5-uh42cc1.pdf
L9942XP1PowerSSO 24AutomotiveEcopack2ipc1752_grv5-uh42cc1.pdf
Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile L9942
circuit_diagram_11778_thumbnail.png L9942
L9942 back EMF stall detection algorithm L9942
L9942 stepper motor driver for bipolar stepper motors L9942
Thermal design calculations for integrated stepper motor driver solutions L9942
ST L9942 evaluation board L9942
L9960 ETC H-bridge L9960
Door actuator driver L9950XP
ipc1752_grv5-uh42cc1.pdf L9942