VK204-25 GPO Question

kfaria · Post by **kfaria** » Sat Feb 18, 2006 11:12 am

Since the GPOs are open collector outputs, can one be used to sink a 12v @ 7ma beeper?
Using an external supply not connected to the display except for the common, of course.

Kurt

Raquel · Post by **Raquel** » Tue Feb 21, 2006 10:11 am

Hello kfaria,

Thanks for your post.

First of all, the VK204-25 modules do not have open drain GPOs. The GPOs on the VK204-25 can only source or sink 20mA at 5V. We offer open drain GPOs (called advanced GPOs) on our USB modules. And these open drain GPOs are limited to 12V, 1A, which is definitely enough for the beeper you are thinking of using.

I hope this helps.

kfaria · Post by **kfaria** » Tue Feb 21, 2006 9:34 pm

Was hoping to utilize a GPO and eliminate 2 more wires to the front panel.
Since this product is scheduled for release in April, switching displays is not an option.
Will look for a 5v beeper with similar dB output.

Raquel · Post by **Raquel** » Wed Feb 22, 2006 10:51 am

Hello kfaria,
Too bad. But another option that I can think of is connecting a fet at the output of the GPO, the logic will be different but then it can definitely handle the requirements for your beeper. If you want to explore that option, I can help you with that.
Good luck.

kfaria · Post by **kfaria** » Wed Feb 22, 2006 10:00 pm

Thanks for your offer, but interposing another FET will be easy, if I decide to go that route.

This is my last product using an MO display, LK204-25.
http://www.catheterholes.com/machines/a ... llerLT.asp

The next product will use a VK204-25, much easier to see.