The bq26501, the first in the bqJUNIOR™ family of advanced gas gauge device for handhald applications, is a highly accurate standalone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting device targeted at space limited portable applications. The device monitors a voltage drop across a small current sense resistor connected in series with the battery to determine charge and discharge activity of the battery. Compensations for battery temperature, self-discharge, and rate of discharge are applied to the charge counter to provide available capacity across a wide range of operating conditions. Battery capacity is automatically recalibrated, or learned, in the course of a discharge cycle from full to empty. Internal registers include available capacity, cell temperature and voltage, state-of-charge, and status and control registers.

The bq26501 can operate directly from single-cell Li-Ion and Li-Pol batteries and communicates to the system over a simple one-wire bi-directional serial interface. The 5-kbits/s HDQ bus interface reduces communication overhead in the external microcontroller.

• Reports Accurate State-of-Charge in Li-Ion and Li-Pol Cells, No System Processor Calculations Needed
• Communicates Directly With the Integrated HDQ Engine in TI OMAP Processors
• Reports Cell Temperature and Voltage
• High-Accuracy Coulometric Charge and Discharge Current Integration with Automatic Offset Cancellation
• Requires No Offset Calibration
• Programmable Input/Output Port
• Internal Time-Base Eliminates External Crystal Oscillator
• Four Automatic Low-Power Operating Modes
  • Active: < 100 A
  • Sleep: < 2.5 A
  • Ship: < 1.7 A
  • Hibernate: < 1.5 A
• Small 8-Pin TSSOP Package
• APPLICATIONS
  • PDAs
  • Smart Phones
  • MP3 Players
  • Digital Cameras
  • Internet Appliances
  • Handheld Devices

• Cell chemistry
• Lead Acid, Li-Ion/Li-Polymer, NiCd, NiMH
• Number of series cells
• Single Cell
• Communication interface
• HDQ
• Battery capacity (Min) (mAh)
• 300
• Battery capacity (Max) (mAh)
• 6000
• Implementation
• Pack, System
• External capacity indication
• None
• Features
• Coulomb Counter
• Operating temperature range (C)
• -20 to 70
• Cell balancing

BQ26501的完整型号有：BQ26501PW，以下是这些产品的关键参数及官网采购报价：

BQ26501PW，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BQ26501PW的批量USD价格：7.402（1000+）