8-bit MicrocontrollersのトピックRe: Replacement for MC68HRC705KJ1CDWE

Replacement for MC68HRC705KJ1CDWE

grills — Wed, 09 Sep 2009 23:22:20 GMT

I was just notified that this part has gone obsolete. It has an end of life buy at this time, but I need to come up with a replacement part. Any suggestions or feed back would be much appreciated.

Re: Replacement for MC68HRC705KJ1CDWE

celsoken — Wed, 09 Sep 2009 23:29:57 GMT

I've upgraded KJ1 designs to MC9SQG8. It's a lot more flash, but probably a long life device and probably cheaper.

Good luck!

Cheers,

Celso

Re: Replacement for MC68HRC705KJ1CDWE

grills — Wed, 09 Sep 2009 23:40:57 GMT

I am not able to find any information on the product.

Re: Replacement for MC68HRC705KJ1CDWE

celsoken — Wed, 09 Sep 2009 23:47:55 GMT

Try the link:

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=S08QG&nodeId=01624684491437

Warning: it is NOT pin-to-pin compatible.

Cheers,

Celso

Re: Replacement for MC68HRC705KJ1CDWE

grills — Wed, 09 Sep 2009 23:54:53 GMT

Well atleast it is a start. Thanks.

Re: Replacement for MC68HRC705KJ1CDWE

grills — Thu, 10 Sep 2009 03:28:09 GMT

Any other suggestions and feed back would still be much appreciated...

Re: Replacement for MC68HRC705KJ1CDWE

bigmac — Thu, 10 Sep 2009 07:16:04 GMT

Hello,

In addition to the MC9S08QG8, other possible possible devices available with reduced pin count packages might include -

MC9S08QB8, MC9S08QE8, MC9S08SE8, MC9S08SG8, MC9S08SH8

Some of the devices are limited to 3.3 volt operation, whereas others are capable of 5 volt operation. The number of peripherals will vary between devices.

Your original code will probably need to be re-written to take into account the new peripheral operational requirements (particularly the timer), and also a potentially higher bus frequency.

Regards,

Mac

Re: Replacement for MC68HRC705KJ1CDWE

celsoken — Thu, 10 Sep 2009 07:35:45 GMT

Mac is - as always - right. The 3.3V voltage applies to some small 9S08s.

And Mac did not mention the HC908 series probably because in some months you could be looking again for a substitute.

S08s are also much better for production line, in-circuit (re)flashing will take only one pin at bed-of-nails testing and this pin is not necessarily dedicated. Remeber that KJ1 needed to be pre-programmed before assembly.

Regards,

Celso

Re: Replacement for MC68HRC705KJ1CDWE

grills — Thu, 10 Sep 2009 21:30:07 GMT

Thanks again for the information. We actually prefer the chip to be a EPROM rather than flash. But it sounds like we are looking at a complete circuit redesign anyway. I was hoping there would be a closer match. Again thanks and any more information would be helpful as well. You guys are great...