Figure 10-1. Differential Filter Component with Symmetrical Layout

10.2.2 Kelvin Connections

Kelvin voltage sensing is very important to accurately measure current and cell voltage. Notice how the

differential connections at the sense resistor do not add any voltage drop across the copper etch that carries the

high current path through the sense resistor. See Figure 10-1 and Figure 10-2.

10.2.3 Board Offset Considerations

Although the most important component for board offset reduction is the decoupling capacitor for VCC, additional

benefit is possible by using this recommended pattern for the coulomb counter differential low-pass filter

network. Maintain the symmetrical placement pattern shown for optimum current offset performance. Use

symmetrical shielded differential traces, if possible, from the sense resistor to the 100-Ω resistors, as shown

in Figure 10-2.

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BQ34Z100-R2

SLUSF37 – DECEMBER 2022

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