Current Sensing

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 ADC’s.

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

 

 

Posted: August 20th, 2012 at 5:26 pm
Last Updated on: March 27th, 2017 at 9:24 am