Stepper motor control

Stepper Motor Controllers

The DC Allen StepIC SC1888xx range of stepper motor controllers, when used in conjunction with a compatible driver, provide flexible control of stepper motors with minimum processor overhead. They are designed to interface directly with full-step, half-step or microstepping drivers and operate from a 5 Volt or 3.3 Volt power supply.

The SC188801 is able to generate step pulse trains at up to 30kHz and is controlled by means of an SPI serial interface. As well as standard acceleration and deceleration modes, the SC188801 command set allows for the programming of arbitrary speed profiles.

Features:

Step rates to 30kHz.
Suitable for full step, half-step and microstepping applications.
5 Volt or 3.3 Volt operation (15kHz max step rate at 3.3V).
SPI interface.
User-definable acceleration and deceleration rates.
User-definable arbitrary speed profiles.
Direct interfacing to Allegro A3977 and similar stepper motor drivers.
4-bit user-programmable current register.
16-bit step-period resolution.
Programmable step-period (1µs - 8µs).
32-bit position register.
On-chip clock generator runs from 32.768kHz crystal.
Ability to share clocks for synchronised operation.
32 pin QFP package.

The SC188803 is similar to the SC188801, but allows step tables of up to 204 entries to be programmed, where more complex step profiles are required.

The SC188804 is a dual stepper controller, allowing two motors to be driven independently. Maximum step rate for this device is 20kHz.

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SC188801

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SC188803

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SC188804

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