BQ34210-Q1 Datasheet, PDF (9/19 Pages) Texas Instruments – Automotive 1-Series Cell System-Side CEDV Fuel Gauge for Rarely Discharged Batteries

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bq34210-Q1
SLUSCG1 – AUGUST 2017
Feature Description (continued)
The integrated End-of-Service (EOS) Determination function is specifically intended for applications where the
battery is rarely discharged, such as in eCall systems, uninterruptible power supplies (UPS), enterprise server
backup systems, and telecommunications backup modules. In such systems, the battery may remain in a fully (or
near-fully) charged state for much of its lifetime, with it rarely or never undergoing a significant discharge. If the
health of the battery in such a system is not monitored regularly, then it may degrade beyond the level required
for a system backup/discharge event, and thus fail precisely at the time when it is needed most.
The EOS Determination function monitors the health of the battery through the use of infrequent learning phases,
which involve a controlled discharge of ~1% capacity, and provides an alert to the system when the battery is
approaching the end of its usable service. By coordinating battery charging with the learning phases, the battery
capacity available to the system can be maintained above a preselected level, which helps to avoid
compromising the battery's ability to support a system discharge event.
NOTE
The following sections offer a brief overview of the content available in the bq34210-Q1
Technical Reference Manual (TRM, SLUUBE8), and should be used only as references to
the respective sections in the TRM for full details.
7.3.1 Device Configuration
The device must select the correct CEDV profile, interrupt functions (enables, levels), and more during its initial
configuration setup. The bq34210-Q1 includes two CEDV profiles (XYZ and ABC), which are stored in ROM. If
neither of these profiles matches the battery used, a new configuration must be stored in RAM using Texas
Instruments tools (see Getting Started for more details). Changing batteries also requires a new initialization of
the configuration settings. This enables the device to be reconfigured for different battery chemistries or
capacities through the host. If another battery is chosen, the parameters must be generated using TI's web-
based tool, Gauge Parameter Calculator for CEDV Gauges (GAUGEPARCAL). The TRM provides further
details.
7.3.2 ALERT Interrupt and SHUTDOWN Wake-up
The interrupt function of the ALERT pin enables the bq34210-Q1 to communicate with the main system.
Even if the host is not using the ALERT functionality, it is recommended that ALERT be connected to a GPIO of
the host so that in cases where the device is in SHUTDOWN, toggling ALERT can wake up the gauge from the
SHUTDOWN state.
7.3.3 Voltage Measurement and Calibration
Voltage measurements and calibration are done automatically. The Battery Management Studio bqStudio tool
aids in setting up this function to match system requirements.
7.3.4 Temperature Measurement
The device can be configured to use an external thermistor (103AT type) to measure temperature or use its
internal temperature sensor.
7.3.5 Charging and Termination
The bq34210-Q1 monitors charging and detects termination. The termination works for Li-Ion, LiFePO4, and
NiMH systems.
7.3.6 Accumulated Charge Measurement
The device measures the accumulated charge and reports the duration over which that charge was accumulated.
The AccumulatedCharge() and AccumulatedChargeTime() registers can be used to send an alert to the host
when a certain threshold is achieved.
Copyright © 2017, Texas Instruments Incorporated
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