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.

• 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

• Cell chemistry
• Lead Acid, Li-Ion/Li-Polymer, NiCd, NiMH
• Number of series cells
• Single Cell
• Communication interface
• HDQ
• Implementation
• Pack, System
• External capacity indication
• None
• Features
• Coulomb Counter
• Operating temperature range (C)
• -20 to 70
• Cell balancing
• —

BQ26221的完整型号有：BQ26221PW，以下是这些产品的关键参数及官网采购报价：

BQ26221PW，工作温度：-20 to 70，封装：TSSOP (PW)-8，包装数量MPQ：100个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ26221PW的批量USD价格：6.692（1000+）

BQ26221PW，工作温度：-20 to 70，封装：TSSOP (PW)-8，包装数量MPQ：100个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ26221PW的批量USD价格：6.692（1000+）