BQ40Z50-R2 Datasheet, PDF (26/51 Pages) Texas Instruments – 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

bq40z50-R2
SLUSCS4 – JUNE 2017
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Feature Description (continued)
8.3.9 Authentication
The bq40z50-R2 supports authentication by the host using SHA-1.
8.3.10 LED Display
The bq40z50-R2 can drive a 3-, 4-, or 5- segment LED display for remaining capacity indication and/or a
permanent fail (PF) error code indication.
8.3.11 IATA Support
The bq40z50-R2 supports IATA with several new commands and procedures. See the bq40z50-R2 Technical
Reference Manual (SLUUBK0) for further details.
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.
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