CIRCUIT DESIGN
Current Sensing
Article by:Geoffrey Hunter
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Low-Side Current Sensing
The following image shows a schematic for a low-side current sensing circuit that can be connected to an ADC. This can be used for applications such as brushed/BLDC motor phase current measurement (see the BLDC Motor Control page). It uses a current sense resistor on the low side of the current path (i.e., next to ground) and then shifts the result away from the rails to \( \frac{V_{cc}}{2} \) for better precision/compatibility with ADCs.
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