ZHCSD75D March 2014 – January 2018
For best possible noise performance, it is extremely important to separate the low current and high current loops to different areas of the board layout. The fuel gauge and all support components should be situated on one side of the boards and tap off of the high current loop (for measurement purposes) at the sense resistor. Routing the low current ground around instead of under high current traces will further help to improve noise rejection. Last, the high current path should be confined to a small loop from the battery, through the FETs, into the PACK connector, and back.