BQ20Z80-V102 Datasheet, PDF (10/24 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK-TM TECHNOLOGY FOR USE WITH THE bq29312A

bq20z80-V102
SLUS681A – NOVEMBER 2005 – REVISED MARCH 2006
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FEATURE SET (continued)
System Present Operation
The bq20z80 pulls the PU pin high periodically (1 s). Connect this pin to the PRES pin of the bq20z80 via a
resistor of approximately 5 kΩ. The bq20z80 measures the PRES input during the PU-active period to determine
its state. If PRES input is pulled to ground by external system, the bq20z80 detects this as system present.
BATTERY PARAMETER MEASUREMENTS
The bq20z80 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 -0.25 V to 0.25 V. The bq20z80 detects charge activity when V_SR = V_(SR1)-V_(SR2)is positive and
discharge activity when V_SR = V_(SR1)-V_(SR2) is negative. The bq20z80 continuously integrates the signal over time,
using an internal counter. The fundamental rate of the counter is 0.65 nVh.
Voltage
The bq20z80 updates the individual series cell voltages through the bq29312A at one second intervals. The
bq20z80 configures the bq29312A to connect the selected cell, cell offset, or bq29312A VREF to the CELL pin of
the bq29312A, which is required to be connected to VIN of the bq20z80. The internal ADC of the bq20z80
measures the voltage, scales and calibrates it appropriately. This data is also used to calculate the impedance of
the cell for the Impedance Track™ gas-gauging.
Current
The bq20z80 uses the SR1 and SR2 inputs to measure and calculate the battery charge and discharge current
using a 5 mΩ to 20 mΩ typ. sense resistor.
Auto Calibration
The bq20z80 provides an auto-calibration feature to cancel the voltage offset error across SR1 and SR2 for
maximum charge measurement accuracy. The bq20z80 performs auto-calibration when the SMBus lines stay
low continuously for a minimum of 5 s.
Temperature
The bq20z80 TS1 and TS2 inputs, in conjunction with two identical NTC thermistors (default are Semitec
103AT), measure the battery environmental temperature. The bq20z80 can also be configured to use its internal
temperature sensor.
COMMUNICATIONS
The bq20z80 uses SMBus v1.1 with Master Mode and package error checking (PEC) options per the SBS
specification.
SMBus On and Off State
The bq20z80 detects an SMBus off state when SMBC and SMBD are logic-low for ≥ 2 seconds. Clearing this
state requires either SMBC or SMBD to transition high. Within 1 ms, the communication bus is available.
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