The BQ3060 Battery Manager is a fully integrated, single-chip, package-based solution providing rich functionality for gas measurement, protection of 2, 3 or 4 series cells and certified Li-Ion battery packs. With a footprint of only 7.8mm x 6.4 mm and a compact 24-pin TSSOP package, the BQ3060 maximizes functionality and safety and greatly reduces the cost and size of solutions for smart batteries. Using its integrated high-performance analog peripherals, the BQ3060 measures and maintains an accurate record of available capacity, voltage, current, temperature, and other key parameters of a Li-ion or Li-polymer battery, and reports the information to the system's main controller on an SMBus 1.1 compliant interface. The BQ3060 provides software priority and second-level over-voltage, under-voltage, over-temperature, over-charge, and hardware over-current during discharge, short-circuit charge and discharge protection.

PW Package 24-Pin TSSOP Top View

1 function

Advanced CEDV (Compensated End-of-Discharge Voltage) measurement

Fully integrated 2, 3 and 4 series Li-Ion or Li-Polymer battery pack manager

8-bit RISC CPU with ultra-low power modes

Full range of programmable protection functions - voltage, current and temperature

SHA-1 authentication

Integrated Flexible Memory Architecture Flash

Supports 2-wire SMBus v1.1 interface high-speed 400kHz programming option

P-CH High-Side Protection FET Driver

Low power sleep mode: <69μA

High precision analog front end with two independent ADCs - high resolution, 15~22 bit integrator coulomb counting - 16 bit Delta-Sigma ADC with 16 channels Multiplexer for voltage, current and current temperature

Ultra-compact package: 24-pin TSSOP PW

System Partition Map

Timing Measurement Interval Chart

The BQ3060 uses an integrating delta-sigma analog-to-digital converter (ADC) for current measurements, and a second delta-sigma ADC for single cell and cell voltage, and temperature measurements.

charge and discharge count

The integrating delta-sigma ADC measures the charge/discharge flow of the battery by measuring the voltage 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 charging activity when VSR = V(SRP) - V(SRN) is positive, and discharging activity when VSR = V(SRP) - V (SRN) is negative. The bq3060 continuously integrates signal time, using an internal counter. The base rate of the counter is 0.65 nVh.

Voltage

The BQ3060 updates the individual series cell voltages at one-second intervals. The BQ3060's internal ADC measures voltage, scale and offset, and is properly calibrated. To ensure accurate differential voltage detection, the IC ground should be connected directly to the most negative terminal of the battery pack, not the positive side of the sense resistor. This minimizes voltage drops on the PCB traces.

Voltage Calibration and Accuracy

The BQ3060 has been voltage calibrated before TI leaves the factory. The BQ3060 voltage measurement signal chain (ADC, high voltage conversion, circuit interconnects) will be calibrated for each cell. External filter resistors, connected from each unit to the VCx input of the bq3060, need to be 1kΩ. Factory calibrated devices are accurate to +/- 10mV per cell at room temperature at 4V cell voltage. Without any customer voltage calibration, as long as the filter resistor value is 1kΩ, this is the expected level of accuracy. If the voltage is better and accuracy is required, customer voltage calibration is required. Application note BQ3060 on calibration and programming can be found in the product web folder.

current

The BQ3060 uses the SRP and SRN inputs to measure and calculate battery charge and discharge currents using 5mΩ to 20mΩ typical. sense resistor.

Automatic calibration

The BQ3060 can automatically calibrate the offset translation circuit between the A/D converter and the high voltage output. In addition, the bq3060 provides automatic calibration for the coulomb counter to eliminate offset errors between voltage SRN and SRP for maximum charge measurement accuracy

temperature

BQ3060 has internal temperature sensor and 2 external temperature sensor inputs TS1 and 2 input TS2 is used with two identical NTC thermistors (Semitec 103AT by default) to detect battery temperature. The bq3060 can be configured to use internal or up to 2 external temperature sensors.

Primary (Tier 1) Safety Features

The BQ3060 supports various battery and system protection functions and can be easily configured. This key security feature includes:

Battery over/under voltage protection

Charge and discharge overcurrent

short circuit

Charge and discharge overheat

AFE watchdog

Secondary (Secondary) Safety Features

The secondary safety feature of the BQ3060 can be used to indicate more severe faults via FUSE (pin 21). This pin can be used to blow an inline fuse to permanently disable charging and discharging of the battery pack. This pin is also used as an input to detect the status of the fuse. Secondary security protection.

Features include:

Safe overvoltage

Charge and discharge safety overcurrent

Charge and discharge safety overheating

Charge FET and Zero-Voltage Charge FET failure

Discharge FET failure

Cell Imbalance Detection

The fuse is blown by the secondary voltage protection IC

AFE Register Integrity Fault (AFE_P)

AFE communication failure (AFE_C)

Charge control function

BQ3060 charge control features include:

Supports JEITA temperature range. Reports charge voltage and charge current temperature ranges based on activation.

Handle more complex charging profiles. Allows the standard temperature range to be divided into 2 sub-ranges and allows the charging current to be varied according to the battery voltage.

Reports the proper charging current required for constant current charging and the proper charging current required to use SMBus to broadcast the voltage required for constant voltage charging of the smart charger.

Use a voltage-based cell balancing algorithm during charging that gradually reduces the charge difference of the cells in the fully charged state of the battery pack. A voltage threshold can be set for the positive point of cell balancing. This prevents a fully charged battery from overcharging and causing excessive degradation by increasing the available package energy by preventing premature charge termination

Supports pre-charge/zero-volt charging

Supports charge inhibit and charge pause if the battery pack temperature is out of range

Report charging failures and indicate charging status with charging and discharging alarms.

Gas metering

The BQ3060 uses advanced CEDV (Compensated End-of-Discharge Voltage) technology to measure and calculate the usable capacity of the battery cells. The BQ3060 accumulates charge and discharge metric currents and charge current measurements that compensate for the temperature and state of charge of the battery.

The BQ3060 estimates the self-discharge of the battery and also estimates the temperature based on adjusting the self-discharge.

Lifecycle data logging capabilities

The BQ3060 provides limited lifetime data logging for analysis of the following key battery parameters:

lifetime maximum temperature

lifetime minimum temperature

Lifetime maximum battery voltage

Lifetime Minimum Battery Voltage