BQ3060 Datasheet, PDF (13/17 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE and PROTECTION with CEDV

bq3060
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SLUS928A – MARCH 2009 – REVISED NOVEMBER 2009
Lifetime Data Logging Features
The bq3060 offers limited lifetime data logging for the following critical battery parameters for analysis purposes:
• Lifetime maximum temperature
• Lifetime minimum temperature
• Lifetime maximum battery cell voltage
• Lifetime minimum battery cell voltage
Authentication
The bq3060 supports authentication by the host using SHA-1.
Power Modes
The bq3060 supports 3 different power modes to reduce power consumption:
• In Normal Mode, the bq3060 performs measurements, calculations, protection decisions and data updates in
1 second intervals. Between these intervals, the bq3060 is in a reduced power stage.
• In Sleep Mode, the bq3060 performs measurements, calculations, protection decisions and data update in
adjustable time intervals. Between these intervals, the bq3060 is in a reduced power stage. The bq3060 has
a wake function that enables exit from Sleep mode, when current flow or failure is detected.
• In Shutdown Mode the bq3060 is completely disabled.
Configuration
Oscillator Function
The bq3060 fully integrates the system oscillators. Therefore the bq3060 requires no external components for
this feature.
System Present Operation
The bq3060 checks the PRES pin periodically (1 second). If PRES input is pulled to ground by external system,
the bq3060 detects the presence of the system.
2-, 3-, or 4-Cell Configuration
In a 2-cell configuration, VC1 is shorted to VC2 and VC3. In a 3-cell configuration, VC1 is shorted to VC2.
Cell Balance Control
If cell balancing is required, the bq3060 cell balance control allows a weak, internal pull-down for each VCx pin.
The purpose of this weak pull-down is to enable an external FET for current bypass. Series resistors placed
between the input VCx pins and the positive battery cell terminals control the VGS of the external FET. See
bq3060 Cell balancing using external MOSFET (SLUA509) for more details.
Battery Parameter Measurements
The bq3060 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.
Charge and Discharge Counting
The integrating delta-sigma ADC measures the charge/discharge flow of the battery by measuring the voltage
drop across a small-value sense resistor between the SR1 and SR2 pins. The integrating ADC measures bipolar
signals from -0.20 V to 0.25 V. The bq3060 detects charge activity when V_SR = V_(SRP)- V_(SRN)is positive, and
discharge activity when V_SR = V_(SRP) - V_(SRN) is negative. The bq3060 continuously integrates the signal over
time, using an internal counter. The fundamental rate of the counter is 0.65 nVh.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): bq3060
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