Features: ` Patented Impedance Track? Technology Accurately Measures Available Charge in Li-Ion and Li-Polymer Batteries
` Better than 1% Error Over Lifetime of the Battery
` Instant Accuracy ¨ No Learning Cycle Required
` Automatically adjusts for battery aging, battery self discharge and temperature inefficiencies
` Supports the Smart Battery Specification SBS V1.1
` Works With the TI bq29330 Analog Front-E(AFE) Protection IC to Provide Complete PaElectronics Solution
` Full Array of Programmable Voltage, Curre and Temperature Protection Features
` Integrated Time Base Removes Need for External Crystal with Optional Crystal Input
` Electronics for 7.2-V, 10.8-V or 14.4-V BattePacks With 50% Fewer External Componen
` Based on a Powerful Low-Power RISC CPU Core With High-Performance Peripherals
` Integrated Field Programmable FLASH Memory Eliminates the Need for ExternalConfiguration Memory
`Measures Charge Flow Using a High-Resolution, 16-Bit Integrating Delta-Sigma Converter
- Better Than 0.65 nVh of Resolution
- Self-Calibrating
` Uses 16-Bit Delta-Sigma Converter for Accurate Voltage and Temperature Measurements
` Extensive Data Reporting Options For
`Improved System Interaction
`Optional Pulse Charging Feature for Improved Charge Times
`Drives 3-, 4- or 5-Segment LED Display for Remaining Capacity Indication
`Supports SHA-1 Authentication
`Lifetime Data Logging
`30-Pin TSSOP (DBT)
Application·Notebook PCs
·Medical and Test Equipment
·Portable InstrumentationPinout
Specifications
| |
RANGE |
| VCC relative to VSS |
Supply voltage range |
0.3 V to 2.75 V |
| V(IOD) relative to VSS |
Open-drain I/O pins |
0.3 V to 6 V |
| VI relative to VSS |
Input voltage range to all other pins |
0.3 V to VCC + 0.3 V |
| TA |
Operating free-air temperature range |
40°C to 85°C |
| Tstg |
Storage temperature range |
65°C to 150°C |
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DescriptionThe bq20z90 SBS-compliant gas gauge IC, incorporating patented Impedance TrackTM technology, is designed for battery-pack or in-system installation. The bq20z90 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z90 monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack, and reports the information to the system host controller over a serial-communication bus. It is designed to work with the bq29330 analog front-end (AFE) protection IC to maximize functionality and safety, and minimize component count and cost in smart battery circuits.
The Impedance Track technology of bq20z90 continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle.
bq20z90 Data Sheet
