something cool i found in an old car alarm - Page 1
Forum section: electronics / beginners

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 09:57:02 am
content: ok.. i found an old car alarm that was pulled from a junk vehical that has a PIC16C73B-04/SP 033033C chip in it....which i found to be useful in most applications as i noted in the blogs on other websites... but i still can't find the scematic for itso that way i can program it to use in other stuff.. and hope it works for to program it with the arduino programing (if it works)

author: David_AVD
author_rank: Super Contributor
timestamp: April 08, 2013, 09:59:21 am
content: I'm pretty sure that particular chip is OTP (One Time Programmable).

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 10:04:06 am
content: I'm not sure about that... it might be useful if i can be able to program it anyways... but that won't stop me from trying anyways

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 10:10:25 am
content: by the way here is the scematic for it too...http://ww1.microchip.com/downloads/en/DeviceDoc/30605D.pdf

author: David_AVD
author_rank: Super Contributor
timestamp: April 08, 2013, 10:43:04 am
content: It is indeed OTP. From the data sheet:QuoteUnless it's the windowed package (UV erasable), there's no real chance of reprogramming that chip. Feel free to have a go of course.

author: ecat
author_rank: Frequent Contributor
timestamp: April 08, 2013, 11:06:17 am
content: The give away is the 'C' in the name. 'F' in the name applies to Flash parts which can of course be reprogrammed - flashed. 'C' obviously stands for 'C'annot be reprogrammed

author: David_AVD
author_rank: Super Contributor
timestamp: April 08, 2013, 11:58:09 am
content: Quote from: ecat on April 08, 2013, 11:06:17 amExcept the PIC16C84 whichisa reprogrammable part.

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 12:26:30 pm
content: yes but this one is the 73 model... which has 28 pins on it

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 12:29:59 pm
content: eh... who knows..... maybe i can get it to work or not.... i guess i just have to find out myself..... now i got to get a breadboard for it -_-

author: dimlow
author_rank: Frequent Contributor
timestamp: April 08, 2013, 12:47:11 pm
content: Quote from: Nickk2057 on April 08, 2013, 09:57:02 amI appreciate your enthusiasm, but programming a OTP Microchip Pic with arduino programming, Your having a laugh.

author: Nickk2057
author_rank: Regular Contributor
timestamp: April 08, 2013, 12:51:01 pm
content: well i did find the pinout for it and it was NOT the exact pinout configuration... so no go on that XD

author: ecat
author_rank: Frequent Contributor
timestamp: April 08, 2013, 02:54:14 pm
content: Quote from: David_AVD on April 08, 2013, 11:58:09 amSo it is!Oh well, so much for my eternal rule of thumb, now I need a new one

author: David_AVD
author_rank: Super Contributor
timestamp: April 08, 2013, 09:10:25 pm
content: Yeah, the PIC16C84 is the only exception to the rule that I can recall. I started programming with the PIC16C54 (way back when) and had to deal with using the JW versions for prototyping. What a pain that was. I did have a few JW parts on rotation in the eraser to cut the wait time down.As for the OP, he must be trolling now. The part in question is OTP. There's no room for maybe in there.

author: amyk
author_rank: Super Contributor
timestamp: April 09, 2013, 08:48:03 am
content: Quote from: David_AVD on April 08, 2013, 09:10:25 pmOTP means you can turn 1s into 0s, just not the other way around... unless the part has security too (not unlikely).X-rays may also be able to erase it.

author: David_AVD
author_rank: Super Contributor
timestamp: April 09, 2013, 08:50:15 am
content: Sure, you can always turn ones into zeros, but that's of very limited use. Speaking of old chips, I have stacks of 16C84 and 16F84 chips laying around waiting to go in the bin.