bq78350-R1

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SLUSCD0 – AUGUST 2015

Feature Description (continued)

9.3.2 Secondary (2nd Level) Safety Features

The secondary safety features of the bq78350-R1 can be used to indicate more serious faults via the SAFE pin.

This pin can be used to blow an in-line fuse to permanently disable the battery pack from charging or

discharging. The secondary safety protection features include:

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Safety overvoltage

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Safety undervoltage

•

Safety overcurrent in charge and discharge

•

Safety overtemperature in charge and discharge

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Charge FET and Precharge FET fault

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Discharge FET fault

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Cell imbalance detection

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Open thermistor detection

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AFE communication fault

9.3.3 Charge Control Features

The bq78350-R1 charge control features include:

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Provides a range of options to configure the charging algorithm and its actions based on the application

requirements

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Reports the appropriate charging current needed for constant current charging, and the appropriate charging

voltage needed for constant voltage charging

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Supports pre-charging/0-volt charging

•

Supports charge inhibit and charge suspend if battery pack temperature is out of temperature range

9.3.4 Fuel Gauging

The bq78350-R1 uses Compensated End-of-Discharge Voltage (CEDV) technology to measure and calculate the

available charge in battery cells. The bq78350-R1 accumulates a measure of charge and discharge currents and

compensates the charge current measurement for the temperature and state-of-charge of the battery. The

bq78350-R1 estimates self-discharge of the battery and also adjusts the self-discharge estimation based on

temperature.

9.3.5 Lifetime Data Logging

The bq78350-R1 offers lifetime data logging, where important measurements are stored for warranty and

analysis purposes. The data monitored includes:

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Lifetime maximum temperature

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Lifetime minimum temperature

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Lifetime maximum battery cell voltage per cell

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Lifetime minimum battery cell voltage per cell

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Cycle count

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Maximum charge current

•

Maximum discharge current

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Safety events that trigger SafetyStatus() updates. (The 12 most common are tracked.)

9.3.6 Authentication

The bq78350-R1 supports authentication by the host using SHA-1.

9.3.7 Battery Parameter Measurements

The bq78350-R1 digitally reads bq769x0 registers containing recent values from the integrating analog-to-digital

converter (CC) for current measurement and a second delta-sigma ADC for individual cell and temperature

measurements.

Copyright © 2015, Texas Instruments Incorporated

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