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BQ20Z40PW-R1 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ20Z40PW-R1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 16 page bq20z40-R1 www.ti.com 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 Submit Documentation Feedback 9 Product Folder Link(s) :bq20z40-R1 |
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