BQ40Z50-R2 datasheet(26/55 Pages) TI2

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• Data Flash Permanent Failure

• Open Thermistor Permanent Failure

8.3.3 Charge Control Features

The BQ40Z50-R2 charge control features include:

• Supports JEITA temperature ranges. Reports charging voltage and charging current according to the active

temperature range

• Handles more complex charging profiles. Allows for splitting the standard temperature range into two sub-

ranges and allows for varying the charging current according to the cell voltage

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

voltage needed for constant voltage charging to a smart charger using SMBus broadcasts

• Reduces the charge difference of the battery cells in a fully charged state of the battery pack gradually using

a voltage-based cell balancing algorithm during charging. A voltage threshold can be set up for cell balancing

to be active. This prevents fully charged cells from overcharging and causing excessive degradation and also

increases the usable pack energy by preventing premature charge termination.

• Supports precharging/0-volt charging

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

• Reports charging fault and also indicates charge status via charge and discharge alarms

8.3.4 Gas Gauging

The BQ40Z50-R2 uses the Impedance Track algorithm to measure and calculate the available capacity in

battery cells. The BQ40Z50-R2 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 BQ40Z50-R2 estimates

self-discharge of the battery and also adjusts the self-discharge estimation based on temperature. The device

also has TURBO Mode 2.0 support, which enables the BQ40Z50-R2 to provide the necessary data for the

MCU to determine what level of peak power consumption can be applied without causing a system reset or

transient battery voltage level spike to trigger termination flags. See the BQ40Z50-R2 Technical Reference

Manual (SLUUBK0) for further details.

8.3.5 Configuration

8.3.5.1 Oscillator Function

The BQ40Z50-R2 fully integrates the system oscillators and does not require any external components to

support this feature.

8.3.5.2 System Present Operation

The BQ40Z50-R2 checks the PRES pin periodically (1 s). If PRES input is pulled to ground by the external

system, the BQ40Z50-R2 detects this as system present.

8.3.5.3 Emergency Shutdown

For battery maintenance, the emergency shutdown feature enables a push button action connecting the

SHUTDN pin to shut down an embedded battery pack system before removing the battery. A high-to-low

transition of the SHUTDN pin signals the BQ40Z50-R2 to turn off the CHG and DSG FETs, disconnecting the

power from the system to safely remove the battery pack. The CHG and DSG FETs can be turned on again by

another high-to-low transition detected by the SHUTDN pin or when a data flash configurable timeout is reached.

8.3.5.4 1-Series, 2-Series, 3-Series, or 4-Series Cell Configuration

In a 1-series cell configuration, VC4 is shorted to VC, VC2, and VC1. In a 2-series cell configuration, VC4 is

shorted to VC3 and VC2. In a 3-series cell configuration, VC4 is shorted to VC3.

8.3.5.5 Cell Balancing

The device supports cell balancing by bypassing the current of each cell during charging or at rest. If the

device's internal bypass is used, up to 10 mA can be bypassed and multiple cells can be bypassed at the same

time. Higher cell balance current can be achieved by using an external cell balancing circuit. In external cell

balancing mode, only one cell at a time can be balanced.

BQ40Z50-R2

SLUSCS4C – JUNE 2017 – REVISED APRIL 2021

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