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BQ20Z90-V110 Datasheet(PDF) 9 Page - Texas Instruments

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Part No. BQ20Z90-V110
Description  SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TECHNOLOGY FOR USE WITH THE bq29330
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ20Z90-V110 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-V110
SLUS743 – NOVEMBER 2006
FEATURE SET (continued)
See Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm application note
(SLUA364) for further details.
The bq20z90-V110 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-V110 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-V110 supports authentication by the host using SHA-1.
The bq20z90-V110 supports 3 different power modes to reduce power consumption:
• In Normal Mode, the bq20z90-V110 performs measurements, calculations, protection decisions, and data
updates in 1 second intervals. Between these intervals, the bq20z90-V110 is in a reduced power stage.
• In Sleep Mode, the bq20z90-V110 performs measurements, calculations, protection decisions, and data
updates in adjustable time intervals. Between these intervals, the bq20z90-V110 is in a reduced power stage.
• In Shutdown Mode the bq20z90-V110 is completety disabled.
The bq20z90-V110 fully integrates the system and processor oscillators and, therefore, requires no pins or
components for this feature.
The bq20z90-V110 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-V110 enters normal operating mode. When the pack is
removed from the system and the PRES input is high, the bq20z90-V110 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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