CIRCUIT DESIGN

Current Sensing

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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.

A schematic for a low-side current sensing circuit that can be connected to a microcontroller/MCU ADC.

A schematic for a low-side current sensing circuit that can be connected to a microcontroller/MCU ADC.


Authors

Geoffrey Hunter

Dude making stuff.

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