STEPPER MOTOR CONTROLLER

The LS7290 generates Phase Drive outputs and PWM outputs for controlling two phase Bipolar motors or four phase Unipolar motors, respectively. The LS7290 contains a mode controlled look-up table for generating the motor duty cycle drive sequences. There are four outputs which are used to drive two H- Bridges for the two motor windings in the Bipolar motor or the four Driver Tran- sistors for the two center-tapped windings in the Unipolar motor (Refer to Table 2). The LS7290 CAN step a motor in full steps, half steps or in 1/4, 1/8, 1/16 or 1/32 microsteps. The LS7290 uses 32 microstepping phase controls for each motor step in half step or in 1/4, 1/8, 1/16 or 1/32 microsteps. The LS7290 uses stepping as shown in Table 2 for full step control. A table pointer is used which is incremented or decremented by a value determined by the operating mode and the direction control. The 8-bit PWM control and the refresh rate are set us- ing an internal Oscillator controlled by a crystal or by use of an external input Clock Typical refresh rate is equal to 31.25kHz. Peak current feedback control using pulse width modulation chopping CAN be used in full-step or half-step modes. The chopper consists of a voltage Comparator Flip-Flop and external sense resistor. The internal Oscillator sets the Flip-Flop and enables the INH1 and INH2 outputs at the beginning of each PWM cycle. Once the peak motor current causes the voltage across the sense resistors to reach the voltage set by VREF, the outputs are disabled until the next Oscillator pulse. The VREF voltage sets the peak current in each motor winding. In all other modes, the VREF input should be set to VDD and the sense inputs should be grounded. By LSI Computer Systems, Inc.
LS7290 's PackagesLS7290 's pdf datasheet



LS7290 Pinout, Pinouts
LS7290 pinout,Pin out
This is one package pinout of LS7290,If you need more pinouts please download LS7290's pdf datasheet.

LS7290 Application circuits
LS7290 circuits
This is one application circuit of LS7290,If you need more circuits,please download LS7290's pdf datasheet.


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