BQ40Z50-R2 Datasheet, PDF (40/51 Pages) Texas Instruments – 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

bq40z50-R2
SLUSCS4 – JUNE 2017
Layout Guidelines (continued)
www.ti.com
PACK +
BMU
COMM
PACK –
Copyright © 2016 , Texas Instruments Incorporated
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
Sense Resistor
Ground Shield
Filter Circuit
Figure 46. Sense Resistor, Ground Shield, and Filter Circuit Layout
40
Submit Documentation Feedback
Product Folder Links: bq40z50-R2
Copyright © 2017, Texas Instruments Incorporated