L9942XP1 데이터 시트보기 (PDF) - STMicroelectronics

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L9942XP1

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

STMicroelectronics 

L9942

Integrated stepper motor driver for bipolar stepper motors

with microstepping and programmable current profile

Features

■ Two full bridges for max. 1.3 A load

(RDSON = 500 m)

■ 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

Applications

Stepper motor driver for bipolar stepper motors in

automotive applications like light levelling,

Bending light and Throttle control.

Table 1. Device summary

Order code

Junction temp. range, C

L9942XP1

L9942XP1TR

-40 to 150

-40 to 150

PowerSSO24

Description

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.

Package

PowerSSO24

PowerSSO24

Packing

Tube

Tape and reel

September 2013

Doc ID 11778 Rev 7

1/40

www.st.com

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