Uln2004a

[unibaza]

i'm using a uln2004a to drive my stepper motor first time. But i've checked the dahasheet of uln2004a and can't see the Vdd pins there. How i feed the entegre with vdd and wht should be the diagram of stepper motor. Should i connect the same Vdd to the motor? And also wht's the ground pin? thnks

 

[Nigel Goodwin]

Presumably it's an open-collector (or open-drain) driver?, so you don't have a Vcc/Vdd pin - try reading the datasheet.

 

[unibaza]

so what should i do with the "com" pin of it and is the 8. pin ground?

 

[Nigel Goodwin]

so what should i do with the "com" pin of it and is the 8. pin ground?

Read the datasheet, ULN series chips often hav e internal diodes, and have a single pin that connects to the feed to the top of the coils.

 

[mcs51mc]

Nigel was once again right
Read the datasheet!!!