BQ26221 Datasheet, PDF (1/20 Pages) Texas Instruments – HIGH PERFORMANCE BATTERY MONITOR IC WITH COUOMB COUNTER, VOLTAGE AND, TEMPERATURE MEASUREMENT

bq26221
SLUS607 − MAY 2004
HIGHĆPERFORMANCE BATTERY MONITOR IC
WITH COULOMB COUNTER, VOLTAGE AND, TEMPERATURE MEASUREMENT
FEATURES
D Communicates Directly With the Integrated
HDQ Engine in TI OMAP Processor
D 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
D High Accuracy Coulometric Charge and
Discharge Current Integration With
Automatic Offset Compensation
D 11-Bit Analog-to-Digital Converter Reports
Battery Voltage With Gain and Offset
Correction
D Differential Current Sense
D 32 Bytes of General Purpose RAM
D 96 Bytes of Flash (Including 32 Bytes of
Shadow Flash)
D 8 Bytes of ID ROM
D Internal Temperature Sensor Eliminates the
Need for an External Thermistor
D Programmable Digital Input/Output Port
D High-Accuracy Internal Timebase Eliminates
External Crystal Oscillator
D Low Power Consumption:
− Operating : 30 µA
− Sleep: 1 µA
− Hibernate: 600 nA
D Single-Wire HDQ Serial Interface
D 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.
RBI
VCC
VSS
HDQ
PW PACKAGE
(TOP VIEW)
1
8
2
7
3
6
4
5
GPIO
SRP
SRN
BAT
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright  2004, Texas Instruments Incorporated
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