You can prepare the Evaluation Kit (EK) for measuring VBAT current based on different scenarios.
To prepare the EK:
- To use P4 as a probe-point for performing current measurement on VBAT, cut the PCB track shorting solder bridge SB4.
- Use bidirectional capable current measurement equipment because current flow on VBAT is bidirectional.
- The automatic trickle charge feature requires the impedance of the measurement circuit to be constant and less than 100 mΩ. Autoranging multimeters may automatically change resistance depending on range, this may lead to the error state of the charger to trigger.
- Mount the series resistor on R20 to use an oscilloscope for measurements. The recommended value is 100 mΩ or lower.
To restore normal kit function after measurement, solder SB4, add a 0 Ω resistor on R20, or apply a jumper across pins 1 and 2 on P4.