BQ35100 Datasheet, PDF (20/26 Pages) Texas Instruments – Lithium Primary Battery Fuel Gauge

bq35100
SLUSCM6A – JUNE 2016 – REVISED JULY 2016
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Layout Example (continued)
10.2.2 Kelvin Connections
Kelvin voltage sensing is very important to accurately measure current and cell voltage. Note 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 18 and Figure 19.
10.2.3 Board Offset Considerations
Although the most important component for board offset reduction is the decoupling capacitor for V_CC, 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 19.
Figure 19. Differential Connection Between SRP and SRN Pins with Sense Resistor
10.3 ESD Spark Gap
Protect the communication lines from ESD with a spark gap at the connector. Figure 20 shows the recommended
pattern with its 0.2-mm spacing between the points.
Figure 20. Recommended Spark-Gap Pattern Helps Protect Communication Lines from ESD
20
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