DS12887 pcb substitute with battery
cclist at sydex.com
Sun Jan 22 16:12:46 CST 2017
On 01/22/2017 01:49 PM, Maciej W. Rozycki wrote:
> A problem with reworking is there is sometimes very little clearance
> available, so any modification has to be made in a clever way or you
> risk a short-circuit. For example in DECstation 5000 systems their
> DS1287 chip is located in the TURBOchannel option slot area with the
> top of the chip almost reaching the solder side of the PCB of any
> option plugged in there.
Although there are several illustrations of the DS1287 rework where a
coin-cell holder was placed atop the chip, there's absolutely no reason
why that has to be so. A couple of wire leads away to an off-board
battery holder, holding, say, an ER14250 half-AA.will work just fine and
keep the battery away from the PCB--or a couple of alkaline AA cells,
which should last a few years. No reason to stick to lithium.
You know--"use your wetware".
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