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Wish to measure current from 1.2V battery with high side sense resistor and LT1787?

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T

treez

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Hello,
The below circuit gives a positive output voltage which corresponds to the current in the sense resistor.
(i.e. output to the micro is referenced to ground even though 'vout' of LT1787 is referenced to -3V, because the opamp circuit has 'level-shifted' it)

-Is their a lower-component-count method of level shifting a voltage that's referenced to -3V, to being referenced at ground?


LT1787 CURRENT MONITOR DATASHEET:
http://cds.linear.com/docs/en/datasheet/1787fc.pdf

LTspice simulation and schematic attached
 

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  • LT1787 Level shifted Vout_1.pdf
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  • LT1787 Level shifted Vout_1.txt
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