STMicroelectronics L9942步进电机驱动器

STMicroelectronics L9942步进电机驱动器是适用于双极步进电机的集成步进电机驱动器，带微步进和可编程电流曲线查找表，以实现对步进电机特征曲线和预期工作状况的灵活调整。可以根据目标条件：可听噪声、振动、转速或转矩的不同，而使用不同的电流曲线。PWM-电流控制电路使用的衰减模式可设为慢速、快速、混合以及自动衰减。在自动衰减模式下，如果下一步的电流要增大，则器件将采用慢速衰减；如果电流减小则使用快速衰减或混合衰减。可编程失速检测在前照灯调平和折射应用中非常有用，可以防止在失速时运行电机过久，实现位置对中。如果检测到失速，则对中过程结束，噪声降至最低。

The STMicroelectronics L9942 Stepper Motor Driver is available in a compact PowerSSO24 package with an exposed pad for enhanced thermal performance.

特性

Two full bridges for max. 1.3A load (RDSON = 500mΩ)
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 < 3μA, typ. T_j ≤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 3V < V_CC < 5.3V and for 7V < V_s < 20V