Can we use MM9Z1_J638 MCU with shunt on Positive pole of the lead acid battery

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Can we use MM9Z1_J638 MCU with shunt on Positive pole of the lead acid battery

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anandathirtha00
Contributor I

In one of our application i need to use this MCU with 100u Ohms shunt on positive side of the battery . When i tried the same with load , I am not getting the proper values of voltage and current . Please confirm.

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Q_man
NXP Employee
NXP Employee

No this is not possible!

The ISENSEL / ISENSEH can only measure GND referenced signals

The table below (from the datasheet) indicates the limitations / requirements for proper operation:

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VINC    is the voltage from ISENSEH to Gnd and from ISENSEL to Gnd

VIND       is the differential voltage between ISENSEH and ISENSEL

Typically the IC/module GND point should be on the Shunt resistor either the "ISENSEH-side" or "ISENSEL-side".

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