PIC16E873

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paperboy136

7 posts

Wannabe Geek

#29473 8-Jan-2009 13:25

Hi guys,

I'm trouble shooting a PSU control unit. The control unit is running on PIC16E873. Was wondering if anyone has played with PIC16E873. I've search the datasheet and still confused. I am actually looking for dark current or leakege current looking back into the pins? The pins that im testing is RB7 and RB6. If anyone have any idea, please reply. Here is the link to the datasheet (http://ww1.microchip.com/downloads/en/DeviceDoc/30325b.pdf)

gomez

84 posts

Master Geek

#188855 11-Jan-2009 21:19

Can you give us more details on the fault?

Also, have you got a PIC programmer, downloaded the code off it and saved it?

paperboy136

7 posts

Wannabe Geek

#188874 11-Jan-2009 23:44

Yes the program is already downloaded on the device and saved it. The problem is I have a pull up resistor (5K) at RB7 and its fed to an optp coupling (817A). The opto coupling gets really hot and voltage across Vce goes up over 1.2v-1.4v meaning the pic will recognize it as logic state 1 or 0. So the pic gets confuse if its state 1 or 0. I just need to confirm the impendence for the pic or dark current (leakage current looking back into the pins) so i can do some calculations and increase the value of pull up resistor.

garryk

45 posts

Geek

#193317 1-Feb-2009 23:14

Maybe you solved this already, but in case not...

Are you sure about that part number? There's no PIC 16Exxx that I know of, and your link points to the specs for 16F8x devices.

Have you tried looking on Microchips site at the App Notes?

Here for example are the Electrical specs of 16C/L/Fxxx devices

http://ww1.microchip.com/downloads/en/DeviceDoc/31030a.pdf

or here in general

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010235.