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BQ20Z90DBT Datasheet(PDF) 9 Page - Texas Instruments |
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BQ20Z90DBT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 27 page www.ti.com 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 Submit Documentation Feedback |
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