bq20z40-R1

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SLUS993A

– DECEMBER 2009 – REVISED MARCH 2011

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

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Lifetime maximum discharge current

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Lifetime maximum charge power

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Lifetime maximum discharge power

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Lifetime maximum average discharge current

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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 three power modes to reduce power consumption:

•

In Normal Mode, the bq20z40-R1 performs measurements, calculations, protection decisions and data

updates in 1-s 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

updates 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

© 2009–2011, Texas Instruments Incorporated

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Not Recommended for New Designs