|Category||Semiconductors => Power Management => Battery Management Products => Battery Fuel Gauge|
|Part family||BQ2060 Multi-Chemistry SBS 1.1 Compliant Gas Gauge With 5 LED Drivers, Additional Battery Mgmt Control|
|Description||Multi-Chemistry SBS 1.1 Compliant Gas Gauge With 5 LED Drivers, Additional Battery Mgmt Control 28-SSOP|
|Company||Texas Instruments, Inc.|
|Datasheet||Download BQ2060SS-E411TR datasheet
|Pin nb||Package type||Ind std||JEDEC code||Package qty||Carrier||Device mark||Width (mm)||Length (mm)||Thick (mm)||Pitch (mm)|
|• Configuring the bq2060 and bq2060a EEPROMs
Charging, discharging, and the entire battery system can be complex and difficult to understand. Accurately measuring energy in and out of this battery system is just as complex. The bq2060/A was developed with extensive, sophisticated functions and algori | Doc
|• Using Advanced Features of the bq2060 Gas Gauge IC
The bq2060 is a Smart Battery System (SBS) 1.1-compliant gas-gauge IC for battery-pack or in-system installation. It maintains an accurate record of available charge in rechargeable NiCd, NiMH, Li-ion, lead acid, and other battery chemistries. This applica | Doc
|• HDQ Communication Basics for TI Battery Monitor ICs
Most battery monitor ICs from TI, including the bq2018 and bq2019, includes a single-wire HDQ serial data interface. Host controllers, configured for either polled or interrupt processing, use the interface to access various IC registers. The purpose of t | Doc
Provides accurate measurement of available charge in NiCd, NiMH, Li-Ion, and lead-acid batteries Supports SBS Smart Battery Data Specification v1.1 Supports the 2-wire SMBus v1.1 interface with PEC 1-wire HDQ16 Reports individual cell voltages Monitors and provides control to charge and discharge FETs in Li-Ion protection circuit Provides 15-bit resolution for voltage, temperature, and current measurements Measures charge flow using a V-to-F converter with offset of less than 16µV after calibration Consumes less than 0.5mW operating Drives or 5-segment LED display for remaining capacity indication 28-pin 150-mil SSOP
The bq2060 SBS-Compliant Gas Gauge IC for battery pack or in-system installation maintains an accurate record of available charge in rechargeable batteries. The bq2060 monitors capacity and other critical battery parameters for NiCd, NiMH, Li-Ion, and lead-acid chemistries. The bq2060 uses a V-to-F converter with automatic offset error correction for charge and discharge counting. For voltage, temperature, and current reporting, the bq2060 uses an A-to-D converter. The onboard ADC also monitors individual cell voltages in a Li-Ion battery pack and allows the bq2060 to generate control signals that may be used in conjunction with a pack supervisor to enhance pack safety. The bq2060 supports the smart battery data (SBData) commands and charge-control functions. It communicates data using the system management bus (SMBus) 2-wire protocol or the Benchmarq 1-wire HDQ16 protocol. The data available include the battery's remaining capacity, temperature, voltage, current, and remaining run-time predictions. The bq2060
provides LED drivers and a push-button input to depict remaining battery capacity from full to empty or 25% increments with or 5-segment display. The bq2060 works with an external EEPROM. The EEPROM stores the configuration information for the bq2060, such as the battery's chemistry, self-discharge rate, rate compensation factors, measurement calibration, and design voltage and capacity. The bq2060 uses the programmable self-discharge rate and other compensation factors stored in the EEPROM to accurately adjust remaining capacity for use and standby conditions based on time, rate, and temperature. The bq2060 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from near full to near empty levels. The REG output regulates the operating voltage for the bq2060 from the battery cell stack using an external JFET.HDQ16 ESCL ESDA RBI REG VOUT VCC VSS DISP LED4 LED5 SMBC SMBD SR1 SR2 SRC TS THON CVON CFC DFC
HDQ16 Serial communication input/output Serial memory clock Serial memory data and address Register backup input Regulator output EEPROM supply output Supply voltage Ground Display control input LED display segment outputs DFC CFC VON trol THON TS SRC SR1 SR2 Discharge FET control Charge FET control Cell voltage divider con-
Thermistor bias control Thermistor voltage input Current sense input Charge-flow sense resistor inputsVCELL1 Single-cell voltage inputs VCELL4 SMBD SMBC SMBus data SMBus clock
DFC Discharge FET control output Output to control the discharge FET in the Li-Ion pack protection circuitry CFC Charge FET control output Output to control the charge FET in the Li-Ion pack protection circuitry CVON Cell voltage divider control output Output control for external FETs to connect the cells to the external voltage dividers during cell voltage measurements THON Thermistor bias control output Output control for external FETs to connect the thermistor bias resistor during a temperature measurement TS Thermistor voltage input Input connection for a thermistor to monitor temperature SRC REG Regulator output Input to monitor instantaneous current Output to control an n-JFET for VCC regulation to the bq2060 from the battery potential VOUT Supply output Output that supplies power to the external EEPROM configuration memory VCC VSS DISP Supply voltage input Ground Display control input Input that controls the LED drivers LED1 LED5 LED display segment outputs Outputs that each may drive an external LED SMBC SMBD SR1 SR2 Sense resistor inputs Input connections for a small value sense resistor to monitor the battery charge and discharge current flow Single-cell voltage inputs Inputs that monitor the series element cell voltages SMBus data Open-drain bidirectional pin used to transfer address and data to and from the bq2060 SMBus clock Open drain bidirectional pin used to clock the data transfer to and from the bq2060 Current sense voltage input
HDQ16 Serial communication input/output Open-drain bidirectional communications port ESCL Serial memory clock Output to clock the data transfer between the bq2060 and the external nonvolatile configuration memory ESDA Serial memory data and address Bidirectional pin used to transfer address and data to and from the bq2060 and the external nonvolatile configuration memory RBI Register backup input Input that provides backup potential to the bq2060 registers during periods of low operating voltage. RBI accepts a storage capacitor or a battery input.
The bq2060 determines battery capacity by monitoring the amount of charge input 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 1 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. The bq2060 accepts an NTC thermistor (Semitec 103AT) for temperature measurement. The bq2060 uses the thermistor temperature to monitor battery pack temperature, detect a battery full charge condition, and compensate for self-discharge and charge/discharge battery efficiencies. The VFC measures bipolar signals to 250mV. The bq2060 detects charge activity when VSR VSR1 is positive and discharge activity when VSR VSR1 is negative. The bq2060 continuously integrates the signal over time using an internal counter. The fundamental rate of the counter is 6.25µVh.
The bq2060 provides an auto-calibration feature to cancel the voltage offset error across SR1 and SR2 for maximum charge measurement accuracy. The calibration routine is initiated by issuing a command to ManufacturerAccess(). The bq2060 is capable of automatic offset calibration down to 6.25µV. Offset cancellation resolution is less than 1µV.
The bq2060 does not measure charge or discharge counts below the digital filter threshold. The digital filter threshold is programmed in the EEPROM and should be set sufficiently high to prevent false signal detection with no charge or discharge flowing through the sense resistor.
While monitoring SR1 and SR2 for charge and discharge currents, the bq2060 monitors the battery-pack potential and the individual cell voltages through the VCELL1VCELL4 pins. The bq2060 measures the pack voltage and reports the result in Voltage(). The bq2060 can also measure the voltage up to four series elements in a battery pack. The individual cell voltages are stored in the optional Manufacturer Function area. The VCELL1VCELL4 inputs are divided down from the cells using precision resistors, as shown in Figure 1. The maximum input for is 1.25V with respect to VSS. The voltage dividers for the inputs must be set so that the voltages at the inputs do not exceed the 1.25V limit under all operating conditions. Also, the divider ratios on VCELL1VCELL2 must be half of that VCELL3VCELL4. To reduce current consumption from the battery, the CVON output may used to connect the divider to the cells only during measurement period. CVON is high impedance for 250ms (12.5% duty cycle) when the cells are measured, and driven low otherwise. See Table 1.
The bq2060 uses a fully differential, dynamically balanced voltage-to-frequency converter (VFC) for charge measurement and a sigma delta analog-to-digital converter (ADC) for battery voltage, current, and temperature measurement. Voltage, current, and temperature measurements are made every 22.5 seconds, depending on the bq2060 operating mode. Maximum times occur with compensated EDV, mWh mode, and maximum allowable discharge rate. Any AtRate computations requested or scheduled (every 20 seconds) may add to 0.5 seconds to the time interval.
The SRC input of the bq2060 measures battery charge and discharge current. The SRC ADC input converts the current signal from the series sense resistor and stores the result in Current(). The full-scale input range to SBC is limited ±250mV as shown in Table 2.
The VFC measures the charge and discharge flow of the battery by monitoring a small-value sense resistor between the SR1 and SR2 pins as shown in Figure 1.
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