Re: [oopic] Re: recovery jumper

On Aug 6, 2008, at 7:23 AM, scottmsavage wrote:

> --- In oopic@yahoogroups.com, Andrew Porrett <slicerwizard@...> wrote:
>>
>> Why do you need to use an I/O line? Why can't you prevent the loss
>> of SCP response by using a removable jumper to open one of the lines
>> between the micro and the EEPROM?
>> Remove jumper, press reset button, micro sees 0x00 or 0xff bytes from
>> disconnected EEPROM data line and presto, SCP works, just like it
>> does if you pry out the EEPROM.
>> Right?
>
> Yes, that is absolutely Right. I did consider that option. But I was
> concerned that the jumper would get taken off inadvertadly, or worse
> yet.. fall off, and then the product would stop working. The EEPROM
> was already in a socket, the user was already expected to have to deal
> with basic electronics, so...I went the way I did.

Both approaches work. The real question is: which is going to cause
more problems over the life of the product? Sockets are notorious
problems and I prefer to solder all the chips in my designs. I would
opt for the jumper myself.

But Savage probably has more information on the failure rates due to
the socket for the EEPROM.

Brian Lloyd
Granite Bay Montessori School 9330 Sierra College Bl
brian AT gbmontessori DOT com Roseville, CA 95661
+1.916.367.2131 (voice) +1.791.912.8170 (fax)

PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C

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