BQ40Z50-R2 datasheet(40/51 Pages) TI1

部品番号	BQ40Z50-R2

部品情報	1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

PDF	51 Pages

Scroll/Zoom	100%

メーカー	TI1 [Texas Instruments]

ホームページ	http://www.ti.com

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40 / 51 page

Sense Resistor

Ground Shield

Filter Circuit

Current Direction

To SRP – SRN pin or HSRP – HSRN pin

RSNS

Current Sensing Direction

PACK +

COMM

PACK –

BMU

bq40z50-R2

SLUSCS4 – JUNE 2017

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Layout Guidelines (continued)

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.

Figure 45. Sensing Resistor PCB Layout

Figure 46. Sense Resistor, Ground Shield, and Filter Circuit Layout

BQ40Z50-R2 データシート(PDF) 40 Page - Texas Instruments