On Mon, Nov 19, 2012, at 03:03 AM, David Meiklejohn wrote:

> Yes, I see what you're saying.  The problem I've had is that I can't find
> (and I've been looking...) a motor driver that interfaces to the PIC,
> using
> the 4 x PWM outputs (P1A - P1D on a 16F684) configured in full-bridge
> mode.
> I also can't see how to configure a L293 (or anything similar) in a way
> that
> would demonstrate the PIC's full-bridge PWM mode.  If you can point out
> any
> examples, I'll happily adopt them!
>=20
> Remember, I'm not trying to show how to make an H-bridge to drive a
> motor.
> The key is to have something that is driven from those 4 full-bridge PWM
> outputs, demonstrating forward and reverse operation as defined in the
> PIC
> data sheet.  An H-bridge driven by a single-output PWM and a GPIO that
> controls forward/reverse is elegant, but doesn't serve to illustrate the
> PWM
> modes as described in the PIC data sheet.

There are lots of H-bridges that work the way you want. Rohm and Toshiba
make many models, here's one that I have doing positioning in thousands
of lasers:

http://www.digikey.com/product-detail/en/BA6287F-E2/BA6287F-E2CT-ND/1158676

Best regards,

Bob

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