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Replacing the battery in the MK48T02

The battery in the MK48T02 lasts about 10 years, typically. It helps if you stopped the clock in the IC before putting it in storage

X-Ray Picture of the MK48T02

Top: Profile.
Click to enlarge
FPGA
Bottom: Pin 1 is at top right. Round disc battery is on the left. Note the die in the middle and the quartz crystal on the right

File & saw at the IC corners at pins 12 and 13 until the battery leads are exposed. Measure the residual voltage to determine the polarity of the battery leads. My results for 6 ICs were: the battery lead closest to pin 12 is always the negative. Cut out battery and superglue a 3V lithium watch battery in its place. Solder wires to the battery leads.

MK48T02 with new battery

FPGA

Click to enlarge

Profile

FPGA

Click to enlarge

Pot the IC in epoxy, and you are done!

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