Randy, That's a very good thought. I think it is OK in this case as the Error
8 (checksum fail) occurs about 3 seconds after power on.
If necessary, I think I could replace the MAX691 supervisory chip with one
that holds the processor in reset for a bit longer (I think the MAX695 would
Dave,
Note the following from Maxim AN 202:
I Replaced My Standard SRAM with an NV SRAM and Now My
System Doesn't Work at All. What Caused This?
In general, this is caused by one of two things:
First, the designer may not have considered the recovery time, or tREC, of
the particular NV SRAM
This gets odder and odder. I put the new DS1220AD into the burner and read
it. Pretty random rubbish.
So I cleared it to all FF and inserted into the meter set to Cal mode and
powered on - it apparently copied the default Cal constants to the NVRAM.
However when I took it out again and
