ELECTRONICS
Apple EIS Battery Measurement
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CASE ANALYSIS
Scenario
Measuring the internal impedance of a lithium-ion battery cell in an Apple device to estimate state-of-health via EIS.
Key decisions
- AC perturbation signal generated by a precision DAC
- Current sensing via a series shunt resistor with differential measurement
- Battery modeled as series resistance and capacitance (simplified Randles)
When to reuse this
When designing a battery fuel gauge or health monitoring system using electrochemical impedance spectroscopy for portable electronics.
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