BQ2060SS Datasheet, PDF (5/59 Pages) Texas Instruments – SBS V1.1-COMPLIANT GAS GAUGE IC

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bq2060
SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005
Figure 1. SMBus Timing Data
tB
Figure 2. HDQ16 Break Timing
Write ”1”
tSTRH
tDSU
tDH
tSSU
Write ”0”
tCYCH
Figure 3. HDQ16 Host to bq2060
Read ”1”
Read ”0”
tSTRB
tDSUB
tDV
tSSUB
tCYCB
Figure 4. HDQ16 bq2060 to Host
tBR
TD201803.eps
FUNCTIONAL DESCRIPTION
GENERAL OPERATION
The bq2060 determines battery capacity by monitoring the amount of charge input to or removed from a
rechargeable battery. In addition to measuring charge and discharge, the bq2060 measures battery voltage,
temperature, and current, estimates battery self-discharge, and monitors the battery for low-voltage thresholds.
The bq2060 measures charge and discharge activity by monitoring the voltage across a small-value series sense
resistor between the battery’s negative terminal and the negative terminal of the battery pack. The available
battery charge is determined by monitoring this voltage and correcting the measurement for environmental and
operating conditions.
Figure 5 shows a typical bq2060-based battery pack application. The circuit consists of the LED display, voltage
and temperature measurement networks, EEPROM connections, a serial port, and the sense resistor. The
EEPROM stores basic battery pack configuration information and measurement calibration values. The EEPROM
must be programmed properly for bq2060 operation. Table 10 shows the EEPROM memory map and outlines
the programmable functions available in the bq2060.
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