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BQ20Z90DBT Datasheet(PDF) 9 Page - Texas Instruments

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Part # BQ20Z90DBT
Description  SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK??TECHNOLOGY FOR USE WITH THE bq29330
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ20Z90DBT Datasheet(HTML) 9 Page - Texas Instruments

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LED Display
LifeTime Data Logging Features
Authentication
Power Modes
CONFIGURATION
Oscillator Function
System Present Operation
bq20z90
SLUS662A – DECEMBER 2005 – REVISED JUNE 2006
FEATURE SET (continued)
See Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm application note
(SLUA364) for further details.
The bq20z90 can drive a 3-, 4-, or 5- segment LED display for remaining capacity indication. The LED drive
current can be adjusted to 3mA, 4mA and 5mA digitally.
The bq20z90 offers a lifetime data logging array, where all 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
The bq20z90 supports authentication by the host using SHA-1.
The bq20z90 supports 3 different power modes to reduce power consumption:
In Normal Mode, the bq20z90 performs measurements, calculations, protection decisions, and data updates
in 1 second intervals. Between these intervals, the bq20z90 is in a reduced power stage.
In Sleep Mode, the bq20z90 performs measurements, calculations, protection decisions, and data updates
in adjustable time intervals. Between these intervals, the bq20z90 is in a reduced power stage.
In Shutdown Mode the bq20z90 is completety disabled.
The bq20z90 fully integrates the system and processor oscillators and, therefore, requires no pins or
components for this feature.
The bq20z90 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, bq20z90 enters normal operating mode. When the pack is removed
from the system and the PRES input is high, the bq20z90 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.
9
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