Datasheet

bq20z655

SLUSAH8A –APRIL 2011–REVISED MAY 2012

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Lifetime Data Logging Features

The bq20z655 offers lifetime data logging, where important measurements are stored for warranty and analysis

purposes. The data monitored include:

• Lifetime maximum temperature

• Lifetime maximum temperature count

• Lifetime maximum temperature duration

• Lifetime minimum temperature

• Lifetime maximum battery cell voltage

• Lifetime maximum battery cell voltage count

• Lifetime maximum battery cell voltage duration

• 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 bq20z655 supports authentication by the host using SHA-1.

Power Modes

The bq20z655 supports three different power modes to reduce power consumption:

• In Normal Mode, the bq20z655 performs measurements, calculations, protection decisions and data updates

in 1 second intervals. Between these intervals, the bq20z655 is in a reduced power stage.

• In Sleep Mode, the bq20z655 performs measurements, calculations, protection decisions and data update in

adjustable time intervals. Between these intervals, the bq20z655 is in a reduced power stage. The bq20z655

has a wake function that enables exit from Sleep mode, when current flow or failure is detected.

• In Shutdown Mode, the bq20z655 is completely disabled.

Product Folder Link(s): bq20z655