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bq26221 High-Performance Battery Monitor IC
Texas Instruments
Description
The bq26221 is an advanced battery monitoring device designed to accurately measure the charge and discharge currents in rechargeable battery packs. Intended for pack integration, the bq26221 contains all the necessary functions to form the basis of a comprehensive battery capacity management system in portable applications such as cellular phones, PDAs, or other portable products. The bq26221 works with the host controller in the portable system to implement the battery management system. The host controller is responsible for interpreting the bq26221 data and communicating meaningful battery data to the end-user or power management system. This device provides 64 bytes of general-purpose flash memory, 8 bytes of ID ROM and 32 bytes of flash-backed RAM for data storage. The nonvolatile memory can maintain formatted battery monitor information, identification codes, warranty information, or other critical battery parameters during periods when the battery is temporarily shorted or deeply discharged.
Features
Communicates Directly With the Integrated HDQ Engine in TI OMAP™ Processor Multifunction Monitoring Integrated Circuit Designed to Work With an Intelligent Host Controller : Provides State of Charge Information for Rechargeable Batteries Provides Accurate Battery Voltage and Temperature Measurement High Accuracy Coulometric Charge and Discharge Current Integration With Automatic Offset Compensation 11-Bit Analog-to-Digital Converter Reports Battery Voltage With Gain and Offset Correction Differential Current Sense 32 Bytes of General Purpose RAM 96 Bytes of Flash (Including 32 Bytes of Shadow Flash) 8 Bytes of ID ROM Internal Temperature Sensor Eliminates the Need for an External Thermistor Programmable Digital Input/Output Port High-Accuracy Internal Timebase Eliminates External Crystal Oscillator Low Power Consumption: Operating : 30 µA Sleep: 1 µA Hibernate: 600 nA Single-Wire HDQ Serial Interface Packaging: 8-LEAD TSSOP
Related Datasheets
| Part Number | Description | Category |
| • BQ2018 | Power Minder |
ICs, Interface |
| • BQ2019 | bq2019: Advanced Battery Monitor IC (Rev. E) | ICs, Interface |
| • BQ2022 | 1K-Bit Serial EPROM with SDQ Interface (Rev. F) | ICs, Interface |
| • BQ20Z95 | SBS 1.1-Compliant Gas Gauge Enabled w/Impedance Track (Rev. A) | ICs, Interface |
| • BQ26200 | High-Performance Battery Coulomb Counter for Cellular Phone Applications (Rev. A) | ICs, Interface |
| • BQ26231 | Low-Cost Battery Coulomb Counter for Embedded Portable Applications | ICs, Interface |
| • BQ27500 | System-Side Impedance-Track Fuel Gauge (Rev. C) | ICs, Interface |
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