BQ34210-Q1 Datasheet, PDF (12/19 Pages) Texas Instruments – Automotive 1-Series Cell System-Side CEDV Fuel Gauge for Rarely Discharged Batteries

bq34210-Q1
SLUSCG1 – AUGUST 2017
8 Application and Implementation
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NOTE
Information in the following application section is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The bq34210-Q1 fuel gauge is a microcontroller peripheral that provides system-side fuel gauging for 1-series
cell batteries of a variety of chemistries. Battery fuel gauging with the fuel gauge requires connections only to
PACK+ and PACK– for a removable battery pack or embedded battery circuit. To allow for optimal performance
in the end application, special considerations must be taken to ensure minimization of measurement error
through proper printed circuit board (PCB) board layout. Such requirements are detailed in Design Requirements.
8.1.1 Getting Started
To help configure and evaluate a bq34210-Q1 solution, Texas Instruments provides many supporting tools on
the TI.com website, including the following:
• Battery Management Studio (bqStudio)
• Gauge Parameter Calculator for CEDV Gauges (GAUGEPARCAL)
• bqProduction to assist with the manufacturing process
These tools work with a TI EVM and with a self-designed solution. The bq34210-Q1 Technical Reference Manual
(SLUUBE8) provides details on programming the gauge.
8.2 Typical Applications
PACK+
LEN
Learning Load Enable from Host
ALERT
SDA
1 SDA
SCL
2 SCL
3 VSS
4 NC
2.2 PF
5 REG18
6 NC
7 REGIN
1 PF
ALERT 14
NC 13
TS 12
NC 11
SRP 10
SRN 9
NC 8
RSENSE
PACK-
+
Battery
_
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Figure 5. Typical Application
8.2.1 Design Requirements
This design, for example, is for an automotive eCall solution. Calculate the required battery capacity by taking
into account the required talk and standby time while in battery backup. Assume 10 minutes for a call followed by
a 60-minute idle time (while pinging still occurs), and finally an additional 10-minute call. Understand the typical
aging characteristics of the battery to know when the remaining capacity still fulfills the required capacity
calculated previously. If the calculations show the requirement for a 1-Ah battery, a reasonable capacity battery
to use would be 20% larger, or 1.2 mAh.
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