I'm going to be using the TS7200 with the on-board MAX197 to measure car
battery voltages. Load dumping is not an issue - the batteries I am using
aren't connected to the alternator.
The chip has a 0-10 VDC range and I need to measure voltages from about 8
to 16 VDC. I had thought of using a simple resistor divider but now I'm
not so sure. The voltage I'm measuring is pretty steady, so speed of
measurement is not an issue; I will be recording once per minute.
The MAX197 http://datasheets.maxim-ic.com/en/ds/MAX197.pdf claims a "input
dynamic resistance" of 21kohms.
Does anyone know what that means? Can I just add 21Kohms in series and
drop the voltage in half? Should I use a 10.5K + 21K divider, and count
on the resistance of the MAX197 to cut that in half?
I don't need absolute accuracy; I can calibrate the resulting readings to
a known-good voltmeter. I do need accuracy over the range I'm expecting.
--Yan
--
If you have eight hours to chop down a tree
spend six sharpening your axe.
--Abraham Lincoln
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