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yes this is the type i need, but because of the amount of I/Os i thought I would do something that comes in 8-channel IC's...
I plan on having two of these test benchs for a single test once i get e ...

yes pretty much this type of system, but not exactly since i have slightly more outputs than inputs.

No i do not need to convert 5V to 24V... that is what the UDN's do.

I just need for the input ...

Mike Walne,

no I mean 24v to 5v.

For testing I am using a 24V supply...

I will update the schematic tonight to show you exactly.

I have this:

uC
...

i would say (but difficult to verify at this point) that I will be around 50mA. For sure I am under 100mA.

But to get an exact number requires alot of research into this since there are many I/O's ...

I am trying to build a test bench for a control box that drives solenoids and uses approximately 90 switches.

Control Box <-------> Test Bench

There are 4 controllers in the Control bo ...

Mike Walne,

To explain exactly what I want to accomplish with this:

I have a machine that drives alot solenoids via relays. There is a Box that has 4 controllers that are used for various func ...

Ttelmah,

You are correct. I should have proofread before submit.

i have uC --> MCP --> UDN.

as far as application I can see the use of this information in general but right now I do no ...

https://picasaweb.google.com/lh/photo/7t5Ul1bFHpA9MR92CAvLRLuM1AnbSS1d_whfZsoNDaM?feat=directlink

the only difference is that the 2803's are replaced with these highside drivers (2981's) now. (and ...

I recieved the UDN2981's finally and tried them out.

Everything seems okay now (I power with +5V and inputs are +24V).

except.....

from the output of the darlington arrays I have wired the ...

Thanks I ordered them... yes they are expensive but it would cost me more to use the surface mount for now.

I will look at final design using the others however.

thanks for the quick reply.

The only problem is that I have 128 I/Os...
compared to the 2981 (with 8 pins) these only have up to 4 outputs.

I like the TPS2085 but do you know of a similar with ...

I know that the ULN2803 is a low-side driver, but I am looking for a high-side darlington if anyone knows of any.

It seems that the UDN2981 cannot be found currently (checking mouser and digikey). ...

I just tried to increase my delay from :

void ResetMCP23X17(){
delay_us(200);
output_high(IORESET);
delay_us(200);
output_float(IORESET);
...

BTW... i did switch back to the PIC4550 for now.

I didnt want to introduce other obstacles before I got everything working as planned.

here is my code:

#include <TEST_BENCH.h>

//-------------------------FILES INCLUDED---------------------------------------
#include <PINOUT.c> // general pinout
#include &l ...