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Electronics => Electronics => Topic started by: drinu on June 14, 2014, 02:32:10 PM

Title: CW5045 Stepper driver
Post by: drinu on June 14, 2014, 02:32:10 PM
Hi all,

I bough the CW5045 stepper motor driver.

Datasheet: (

I will be connecting the STEP, DIR and ENA to a PIC microcontroller. Do I need to include a current limiting resistor with every input or should I connect them directly to the PIC output?
If a resistor is requires, what value would be suitable?

Thanks in advance.
Title: Re: CW5045 Stepper driver
Post by: jkerns on June 14, 2014, 03:42:40 PM
On the 4th page of the data sheet you referenced, it shows that inside the driver, each of these inputs has a current limiting resistor and an LED (for optical isolation), with the current required being < 20 ma. If the data sheet is accurate, that would suggest that additional current limiting resistors would not be necessary or desired.