BQ20Z40-R1 Datasheet, PDF (9/16 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™ TECHNOLOGY FOR USE WITH THE bq29330

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bq20z40-R1
SLUS993 – DECEMBER 2009
Lifetime Data Logging Features
The bq20z40-R1 offers lifetime data logging, where important measurements are stored for warranty and
analysis purposes. The data monitored include:
• Lifetime maximum temperature
• Lifetime minimum temperature
• Lifetime maximum battery cell voltage
• Lifetime minimum battery cell voltage
• Lifetime maximum battery pack voltage
• Lifetime minimum battery pack voltage
• Lifetime maximum charge current
• Lifetime maximum discharge current
• Lifetime maximum charge power
• Lifetime maximum discharge power
• Lifetime maximum average discharge current
• Lifetime maximum average discharge power
• Lifetime average temperature
Authentication
The bq20z40-R1 supports authentication by the host using SHA-1.
Power Modes
The bq20z40-R1 supports 3 different power modes to reduce power consumption:
• In Normal Mode, the bq20z40-R1 performs measurements, calculations, protection decisions and data
updates in 1 second intervals. Between these intervals, the bq20z40-R1 is in a reduced power stage.
• In Sleep Mode, the bq20z40-R1 performs measurements, calculations, protection decisions and data update
in adjustable time intervals. Between these intervals, the bq20z40-R1 is in a reduced power stage. The
bq20z40-R1 has a wake function that enables exit from Sleep mode, when current flow or failure is detected.
• In Shutdown Mode the bq20z40-R1 is completely disabled.
CONFIGURATION
Oscillator Function
The bq20z40-R1 fully integrates the system and processor oscillators and, therefore, requires no pins or
components for this feature.
System Present Operation
The bq20z40-R1 periodically verifies the PRES pin and detects that the battery is present in the system via a low
state on a PRES input. When this occurs, bq20z40-R1 enters normal operating mode. When the pack is
removed from the system and the PRES input is high, the bq20z40-R1 enters the battery-removed state,
disabling the charge, discharge and ZVCHG FETs. The PRES input is ignored and can be left floating when
non-removal mode is set in the data flash.
BATTERY PARAMETER MEASUREMENTS
The bq20z40-R1 uses an integrating delta-sigma analog-to-digital converter (ADC) for current measurement, and
a second delta-sigma ADC for individual cell and battery voltage, and temperature measurement.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s) :bq20z40-R1
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