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

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.