L9942

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製品概要

概要

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.

特徴
Two full bridges for max. 1.3 A load(R_DSON= 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 I_S< 3 μA, 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 3 V < Vcc < 5.3 V and for 7 V < Vs < 20 V
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