BQ34210-Q1 Datasheet, PDF (15/19 Pages) Texas Instruments – Automotive 1-Series Cell System-Side CEDV Fuel Gauge for Rarely Discharged Batteries

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10 Layout
bq34210-Q1
SLUSCG1 – AUGUST 2017
10.1 Layout Guidelines
• A capacitor of a value of at least 2.2 µF is connected between the REG18 pin and VSS. The capacitor should
be placed close to the fuel gauge and have short traces to both the REG18 pin and VSS as shown in
bq34210-Q1 Capacitor Layout. This regulator must not be used to provide power for other devices in the
system.
• If the connection between the battery pack and the gauge REGIN pin has the potential to pick up noise, it is
required to have a capacitor of at least 1.0 µF connect between the REGIN pin and VSS. Place the capacitor
close to the fuel gauge and have short traces to both the REGIN pin and VSS.
• The SRP and SRN pins should be Kelvin connected to the R_SENSE terminals.
• For the low-side sense resistor:
– Connect SRP to the battery pack side of R_SENSE and SRN to the system side of the R_SENSE, as shown in
bq34210-Q1 Sense Resistor Layout.
– Kelvin connect the REGIN pin to the battery PACK+ terminal.
10.2 Layout Example
SRN / SRP
bq34210
Common
Mode Cap
Noise
Reduction
Resistors
R_SENSE
Figure 8. bq34210-Q1 Sense Resistor Layout
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