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BQ76952
SLUSE13A – JANUARY 2020 – REVISED MAY 2021
circuit ranges of the BQ76952 device. Parallel resistors can be used as long as good Kelvin sensing is
ensured. The device is designed to support a 1-mΩ sense resistor.
•
In reference to the system circuitry, the following features require attention for component placement and
layout: Differential Low-Pass Filter, and I
•
The BQ76952 device uses an integrating delta-sigma ADC for current measurements. For best performance,
100-Ω resistors should be included from the sense resistor terminals to the SRP and SRN inputs of the
device, with a 0.1-μF filter capacitor placed across the SRP and SRN pins. Optional 0.1-µF filter capacitors
can be added for additional noise filtering at each sense input pin to ground. All filter components should
be placed as close as possible to the device, rather than close to the sense resistor, and the traces from
the sense resistor routed in parallel to the filter circuit. A ground plane can also be included around the filter
network to add additional noise immunity.
•
The BQ76952 device internal REG18 LDO requires an external decoupling capacitor, which should be placed
as close to the REG18 pin as possible, with minimized trace inductance, and connected to a ground plane
electrically connected to VSS.
2
•
The I
C clock and data pins have integrated ESD protection circuits; however, adding a Zener diode and
series resistor on each pin provides more robust ESD performance.
18.2 Layout Example
An example circuit layout using the BQ76952 device in a 16-series cell design is described below. The design
implements the schematic shown in
card assembly, with cell connections on the left edge, and pack connections along the top edge of the board.
Wide trace areas are used, reducing voltage drops on the high current paths.
The board layout, which is shown in
designator prefix E. These spark gaps are fabricated with the board and no component is installed.
76
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2
C communication.
Figure 16-2
and
Figure
16-3, and uses a 2.75-inch × 3.9-inch 2-layer circuit
Figure 18-1
and
Figure
Product Folder Links:
18-2, includes spark gaps with the reference
Copyright © 2021 Texas Instruments Incorporated
BQ76952
www.ti.com
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