BQ40Z50-R2 datasheet(28/55 Pages) TI2

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8.3.12 Voltage

The BQ40Z50-R2 updates the individual series cell voltages at 0.25-s intervals. The internal ADC of the

BQ40Z50-R2 measures the voltage, and scales and calibrates it appropriately. This data is also used to

calculate the impedance of the cell for the Impedance Track gas gauging.

8.3.13 Current

The BQ40Z50-R2 uses the SRP and SRN inputs to measure and calculate the battery charge and discharge

current using a 1-mΩ to 3-mΩ typ. sense resistor.

8.3.14 Temperature

The BQ40Z50-R2 has an internal temperature sensor and inputs for four external temperature sensors. All

five temperature sensor options can be individually enabled and configured for cell or FET temperature usage.

Two configurable thermistor models are provided to allow the monitoring of cell temperature in addition to FET

temperature, which use a different thermistor profile.

8.3.15 Communications

The BQ40Z50-R2 uses SMBus v1.1 with MASTER mode and packet error checking (PEC) options per the SBS

specification.

8.3.15.1 SMBus On and Off State

The BQ40Z50-R2 detects an SMBus off state when SMBC and SMBD are low for two or more seconds. Clearing

this state requires that either SMBC or SMBD transition high. The communication bus will resume activity within

1 ms.

8.3.15.2 SBS Commands

See the BQ40Z50-R2 Technical Reference Manual (SLUUBK0) for further details.

8.4 Device Functional Modes

The BQ40Z50-R2 supports three power modes to reduce power consumption:

• In NORMAL mode, the BQ40Z50-R2 performs measurements, calculations, protection decisions, and data

updates in 250-ms intervals. Between these intervals, the BQ40Z50-R2 is in a reduced power stage.

• In SLEEP mode, the BQ40Z50-R2 performs measurements, calculations, protection decisions, and data

updates in adjustable time intervals. Between these intervals, the BQ40Z50-R2 is in a reduced power stage.

The BQ40Z50-R2 has a wake function that enables exit from SLEEP mode when current flow or failure is

detected.

• In SHUTDOWN mode, the BQ40Z50-R2 is completely disabled.

See the BQ40Z50-R2 Technical Reference Manual (SLUUBK0) for further details.

BQ40Z50-R2

SLUSCS4C – JUNE 2017 – REVISED APRIL 2021

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