LPCXpresso IDEのトピックhang upat start using ULN2803A

hang upat start using ULN2803A

lpcware — Thu, 16 Jun 2016 00:15:54 GMT

Content originally posted in LPCWare by ron12341 on Sun May 19 06:38:32 MST 2013
Hello

after connecting my lcp1769 to a ULN2803A like on the pic attached it wonÂ´t start up anymore. LED2 seems to be be half on and the debugger does not go into main function.
If I disconnect the IC everything starts up fine.
Any idea?

Also If i drive the ULN manually by 3.3V everything is fine which tells me the circuit must be ok....
Is there any special configuration on software side necessary?

Thanks
br
Ron

Re: hang upat start using ULN2803A

lpcware — Thu, 16 Jun 2016 00:15:56 GMT

Content originally posted in LPCWare by R2D2 on Sun May 19 06:48:52 MST 2013
Are you aware that P2.10 is the ISP pin?

Re: hang upat start using ULN2803A

lpcware — Thu, 16 Jun 2016 00:15:56 GMT

Content originally posted in LPCWare by ron12341 on Sun May 19 07:10:33 MST 2013
no actually not.
how can i deactivate that?

Re: hang upat start using ULN2803A

lpcware — Thu, 16 Jun 2016 00:15:57 GMT

Content originally posted in LPCWare by R2D2 on Sun May 19 07:23:13 MST 2013

Quote: ron12341
how can i deactivate that?

Since you are a beginner you don't want to disable ISP :)

Just use another pin or a 'strong' pullup like 4.7k or 10k.

Re: hang upat start using ULN2803A

lpcware — Thu, 16 Jun 2016 00:15:58 GMT

Content originally posted in LPCWare by ron12341 on Sun May 19 07:29:30 MST 2013
Thanks a lot for ur help.
I changed pins and works fine!
br Ron