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LSI-LS7290
| Package Type | PDIP |
|---|---|
| Pin Count | 24 |
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Product Information
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. 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 using an internal oscillator controlled by a crystal or by use of an external input clock. 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 VREF voltage sets the peak current in each motor winding. Note: This series has a minimum purchase requirement of 10 pieces, regardless of stock.
- Controls Bipolar and Unipolar Motors
- Cost-Effective Replacement for L297 in Bipolar Applications
- Full, 1/2, 1/4, 1/8, 1/16, 1/32 Step Mode Selected with 3 Mode Inputs
- Direction Control
- PWM Chopper Circuit for Current Control
- 8-bit PWM Resolution
- Two Peak Current Comparators with External Reference Input
- Step Control Frequency and Duty Cycle Controlled by an External Frequency Source or by an Internal Crystal-Controlled Oscillator (Typically 8MHz)
- All inputs and Outputs TTL/CMOS Compatible
- 3V to 5.5V Operation (Vdd - Vss)
- RoHS Compliant
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User Manual (PDF)
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