BQ4050 Datasheet, PDF (43/53 Pages) Texas Instruments – CEDV Gas Gauge and Protection Solution

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Layout Guidelines (continued)
bq4050
SLUSC67A – MARCH 2016 – REVISED MARCH 2016
Figure 44. Avoid Close Spacing Between High-Current and Low-Level Signal Lines
Kelvin voltage sensing is extremely important in order to accurately measure current and top and bottom cell
voltages. Place all filter components as close as possible to the device. Route the traces from the sense resistor
in parallel to the filter circuit. Adding a ground plane around the filter network can add additional noise immunity.
Figure 45 and Figure 46 demonstrates correct kelvin current sensing.
Current Direction
RSNS
Current Sensing Direction
To SRP – SRN pin or HSRP – HSRN pin
Figure 45. Sensing Resistor PCB Layout
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