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It used an L293D and a, uhmm, err, and a...

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intabits:
Many years ago a friend showed me a small stepper motor (from an old Tandon 20MB hard disk drive) being controlled by two DIP chips, and working very nicely. I remember that one was the L293D dual H-Bridge, but can't recall what the other was, or find any reference that includes another chip typically used with the L293D. Sadly, my friend is no longer with us, so I can't ask him about this.

I believe the second chip had a similar part number to the L293, and was a standard chipset "companion" for it. IIRC, it would take 2 signals, Step and Direction, and generate the 4 phase signals needed by the L293.

Does this ring any bells?
Can anyone tell me what this second chip might have been?

brabus:
L297

T3sl4co1l:
Likely thinking of L297?  Paired with L293 (DIP) or L298 (tabbed "Multiwatt") and some support components, you get a full current mode stepper controller.

Modern solutions are fully integrated, MOSFET based (far less voltage drop), can switch faster, offer fractional or micro stepping, and can be controlled by serial buses (I2C, SPI).

Tim

intabits:
L297 - That's it!

I was looking at a simple project using mini motors and leadscrews from DVD drives, and thinking about cheap and cheerful ways of driving them.
I've done it with cheap L298 modules, but they need 4 I/O lines/motor, so I wanted to look at this forgotten (by me) chip to see how it might help.

Yes, I know there are much better/smarter solutions out there. And I've used some of the lower end ones with larger motors happily, but for these mini motors, L293Ds are fine.

Thanks for the help!

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